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 525i 89-91 M20 Engine

Korman Stock Rebuild

Our stock rebuilds are assembled to BMW specifications by our experienced and dedicated technicians rather than off a mass production assembly line. Korman engines are assembled with meticulous craftsmanship, precise machining, and detailed blueprinting. All of our boring is done with a torque plate for exceptional bore roundness and long engine life. These hand built engines are available at prices below factory reman units and ours carry a 24 month/24,000 mile warranty.

525i P/N 11036200

 

Korman Stage 1-M20 525i

Our Stage 1 rebuild will provide a strong increase in power through the use of our proven performance techniques. Special valve and valve seat work, increased compression, Korman-Stahl Headers and Stage 1 cylinder head porting will net a gain of 12-25 HP depending on model. Performance computer chip recommended but not required.   525i P/N 11036510

 

Korman Stage 2 Competition Engine-M20 525i

Our Stage 2 engines are designed for maximum performance without adversely affecting engine life or driveability. All Stage 2 Engines receive our flow testing porting and polishing, proven 3 angle valve seat work, back cut intake valves, dual valve springs, titanium retainers, Korman Rocker Arms, Korman-Stahl headers, and a Schrick 272 Camshaft (or Schrick 284 or 288). M20 "i" engines receive our aluminum flywheell. Korman performance computer chip required.

 525i P/N 11036350                                                                                                   

 

Stage 1 High Performance Clean Air Engine-525i

In our Stage 1 Clean Air Engines we apply our high performance techniques to extract maximum power from stock parts while making no changes that affect Federal or State emissions laws. Our flow tested porting, polishing, valve and valve seat work promote smoother, more efficient air/fuel flow keeping the mixture better suspended for cleaner burning. Valve spring pressure is increased for a higher max rev limit of 7000 rpm. To reduce reciprocating weight and improve acceleration we lighten and balance the connecting rods, fit stronger light weight piston pins, and lighten the flywheel. These techniques produce a 10-15% power increase and an engine which revs much more quickly. Korman Performance computer chip suggested, not required. 

525i P/N 110365C0

 

Korman Stage 2 Clean Air Engine 525i

These engines receive our Stage 2 competition-type engine treatment for maximum emissions legal performance. Porting and polishing are more extensive than in our Stage 1 Clean Air Engine, and all valves are swirl polished. Also included are our titanium valve spring retainers, dual valve springs, Korman Rocker Arms, light weight steel alloy connecting rods, light weight piston pins and our lightened steel or aluminum flywheel (depending on model).  Tuned exhaust headers are included with a ceramic thermal barrier coating and our special engine oiling system modifications, special computer chip required.

525i P/N 11036650C

 

Korman 2.7 Liter Stroker Engines

Our special conversions include a high performance 2.7L crankshaft and stronger valve springs which allow safe revs to 6900 rpm. This conversion is available on all of our M20 Stock, Stage 1 and 2 Competition and Stage 1 and 2 Clean Air Engines. Call for suggestions and pricing for any applications not listed.

  • 2.7i Standard Engine P/N 11327200

  • 2.7i Stage 2 Competition Engine P/N 11327350

  • 2.7i Stage 1 High Performance Clean Air Engine P/N 113275CO

  • 2.7i Stage 2 High Performance Clean Air Engine P/N 113276CO

Korman 2.9 Liter M20 Engines

Our latest M20 high performance development project has been highly successful. Super strong, tremendous torque, and very durable, this motor brings your roughly 20 year old car up to today’s performance standards.  This motor in an E21 323 chassis has won numerous CCA Club Racing D Mod races, often finishing ahead of most C Mods, and even winning first overall and regional club racing championships.

 

Korman 2.9 ltr M20 Motor – Stage 1

Includes special crankshaft (86mm stroke), custom length competition connecting rods, light weight Mahle pistons, oiling system modifications for more flow to rod bearings, oil sprayers to cool pistons and enable less piston expansion, closer piston/wall clearance for better sealing and longer life. Plus all our Stage 1 porting, polishing, lightening, balancing, blueprinting etc and tuned headers and a custom computer chip.

P/N 1103690

Korman 2.9 ltr M20 Motor – Stage 2 Clean Air

All of our Stage 1 parts and mods plus high performance parts that increase acceleration but do not affect exhaust emissions.  K&N air filter, Korman polished rocker arms, dual valve springs, titanium valve spring retainers, lt wt piston pins, and aluminum flywheel kit (195HP) P/N 110360CA

 

Korman 2.9 ltr M20 Motor – Stage 2 Competition

Same as our Stage 2 Clean Air Engine but adds Schrick 288 or 304 cams plus stronger valve springs. Not designed for street/highway use for vehicles subject to EPA or state emissions standards. Includes additional porting for increased flow with Schrick cams. (235HP)   P/N 1103690R

Recommended Options: 

Extrude honed intake manifold                                                                                 

Big throttle body                                                                                                      

Lt wt, H.D. sport clutch assy                                                                                 

Dyno running-in, tuning, testing   

                 

Korman Race Engines

Whatever your series, whatever your specifications, Korman can build you a dependable, long lasting engine engineered for maximum power. Whether you need a more durable engine for low cost club or vintage racing or a 325HP fully modified race winner, call us first!

     

 

 M20 Engine Components

 

Korman Computer Chip -525i M20 89-91

For ECU #'s 0.261.200.173, 380, 524, 525, 526. 15hp gain, rev limit reset to 6900 RPM. P/N 124M20500

 

These are Schrick's street performance cams. All give a strong increase in power across the full rev range while retaining a smooth idle. They do not require cutting for additional piston/valve clearance. They are designed to perform with the BMW original fuel injection systems.

Schrick performance camshafts are not emissions legal. Sold for off road use only.

M20 Schrick Camshafts

         Schrick 272-272 duration, 11 mm lift. Smooth idle, works with automatic transmission. Best when used with Korman performance chip. Dual valve springs required. P/N 11386272323

         Schrick 284-284 intake duration (11.4mm lift), 272 exhaust duration (11.0mm lift).  Split profile cam gives nice gains at higher rpm’s without sacrificing low end power. P/N 11386284323

         Schrick 288-288 duration, 11.4mm of lift. Lumpy idle limits application to manual transmission models only. Works best with Korman performance chip, free flow intake and exhaust systems. Korman Dual Valve Springs and titanium retainers required. P/N 11386288323

         Schrick 304-304 duration, 12.2mm lift. Race profile, requires modified valve train, deeper piston relief, custom fuel management or stand alone engine management.  P/N 11386304323

M20 6 Cyl. Stage 2 Korman  rocker arms, dual valve springs, titanium valve spring retainers. Designed for Schrick cams. P/N 11396420

 

 

Valve Train Components

Korman Rocker Arms

Lightened cast alloy rocker arms, contoured, peened and polished. Radiused to clear valve spring retainers with high lift cams. Sold each. 

M20 6 Cyl. P/N 1133K271429

 

Korman Racing Rocker Arms

Similar to above, fully polished arm, pads micropolished.  M20 6 Cyl. P/N 1133R271429

 

High Performance Dual Valve Springs

Includes center damper spring sleeve. Long life with revs to 7600 RPM. No cylinder head machining required. Fits all M20 engines. M20 requires use of our titanium valve spring retainers, below.  P/N 11341204N

 

Schrick Racing Valve Springs

Made to sustain very high spring pressures, very high cam lift, and extended high RPM. Will maintain original tension four or five times longer than any other spring that we tested for BMW engines. Use with titanium retainers, sold each. Fits all M20 engines.      P/N 11341028 (inner and outer set, each)

 

Titanium Valve Spring Retainers

About half the weight and twice as strong as steel. Used in all our Stage 3, 4, and race engines. Weight is 12.5 grams each.

For Korman Dual Valve Springs- M20 P/N 11342003

For Schrick Racing Valve Springs- M20 P/N 11341030

Korman BMW Valves

M20 engines manufactured before 12/86 have 40 mm intake and 34 mm exhaust valves. Upgrading to the sizes below offers a nice increase in flow, provided your cylinder head ports are enlarged to take advantage of the bigger valves. Swirl polished, profiled, and radiused for improved flow.

42 mm intake P/N 1134K708895

36 mm exhaust P/N 1134K708896

 

Pistons and Connecting Rods

High Compression Pistons

In addition to standard pistons, we offer the following special pistons. All piston sets include rings, pins and clips. You MUST provide your bore size when ordering.

M20 325i 9.7:1 112508265

M20 2.7i 9.5:1 P/N 112508254

 

Lightweight Piston Pins

Similar to those used in our racing pistons. Nice addition to any engine job. Ten to twenty percent lighter than stock pins, suitable for full race or street applications.  M20 6 Cyl. P/N 1125K712120

 

Korman Modified Connecting Rods

Lightened, balanced, peened, sized, rebushed, and alignment checked. About 8% lighter than stock rods. Shipped complete with new rod bolts and nuts. Price is for servicing your rods.  M20 325 P/N 11241203

 

Korman Lightweight Competition Connecting Rods

Designed for full race use, equally suitable for the street. Super strong and light alloy composition reduces the rotating mass of your engine, reduces stress forces at high RPM. About 25% lighter than stock, can be ordered in stock sizes or custom lengths for special applications.     

M20 6 Cyl. (485 grams) P/N 11241600 

    

Polished, Krinkle Finished Valve Covers & Intake Manifolds

Parts are cleaned and glass peened for superior paint bond. Raised ribs and BMW logos are reworked to a polished finish. Can be supplied with your new engine or shipped on an exchange basis. Available in black, red or blue.

M20 Valve Cover P/N LAB11126035

M20 Intake P/N LAB11126200

 

 

 

Heavy Duty Alternator Bushings

These heavy duty polyurethane bushings replace your stock rubber units. The stock rubber bushings collapse over time causing misalignment of the alternator, and premature belt wear or failure. Look and see if your alternator is crooked, then use these improved bushings for a long term solution.  Long Bushings (4 required) P/N 12311268433

 

Heavy Duty Hard Rubber Motor Mounts

Our mounts reduce unwanted engine movement during hard acceleration, braking and cornering. Sold in pairs.

E30 325>86 P/N 11810325S               E30 325 87> P/N 11810325A

Engine Oiling

Engine Oiling System Modifications

Modification to the crankshaft and main bearings increase bottom end oil pressure, prevent oil from pooling in cylinder head at continuous high RPM operation. Kit includes special main bearings, new oil pump with sprocket and hardware. You must ship your crankshaft to us for modification.                                                    M20 6 Cyl. P/N 11411206

 

 

High Performance Canton Mecca Oil Filters

These filters pass Korman requirements for flow, pressure drop, and size of particles filtered out. Excellent protection for street, autocross or full race conditions. Filter utilizes a synthetic element which you simply replace at your service interval.

Spin On Type 

For installation to original BMW filter housings. Fits M20. Cast aluminum housing.  P/N 114202526

 

Remote Competition Type Filters

1/2"NPT threads, installs as a remote unit. Stainless steel mounting bracket included.  P/N 114202500

Replacement Filter Elements       Each P/N 114202600    6 Pack P/N 114202602

 

525i, iT 92>M50 Engine

Korman Stock Rebuilds

M50 2.5, M52TU 2.5 & 2.8, M52 2.8, S50 3.0, S52 3.2

Building these engines for professional and amateur race series since their introduction gives us unique insight into what makes a reliable, powerful engine. Hours on the dyno and on the track has let us build engines for our customers that have put them in the winner's circle time after time.

Even our stock rebuilds benefit from our competition experience. Our engines are hand-assembled in-house to factory tolerances or better.  Where applicable, components are updated for improved performance and durability.  We prefer OE pistons for best service life, and as with all our engines a torque plate is employed during machining for the best bore possible. Our comprehensive packages include many internal and external components not found in cheaper rebuilds, and we always return your engine ready to install, not stripped down. 

2.5 Non-Vanos P/N 110M50001

2.5 Vanos P/N 110M50002 

Our engines are priced built on your good core

Engine Components

Aluminum Thermostat Housing

The OE plastic thermostat housings are a common failure point.  Over tightening, heat and time lead to eventual cracking and sudden coolant loss.  Our aluminum thermostat housing is a direct replacement and eliminates the problem permanently. 

E36 M3, 328, 325 P/N 1153K722531

    

525i Camshaft Installation Kit

Includes necessary parts for installation of our Roadsport or Clubsport cams in your VANOS 328 or 325. Includes special valve springs, titanium retainers, valve locks, and hardened lower spring plates.

P/N 11396450

 

Schrick Camshafts-525 Non-VANOS

Schrick cams represent the newest and most advanced designs for BMW engines. Sophisticated changes in lobe center angles and larger base circles enable reliable utilization of high lift. Their chief quality is their ability to produce a great increase in power across a wide RPM range. Clean idling and strong bottom end torque are combined with superior top end power. They do not require fly-cutting the pistons for additional clearance, fuel injection modification or any additional installation parts. Must be installed in pairs.  256 duration, 10.4mm lift.  

P/N  11386256

 

Korman Big Valves

Larger valves feature a stepped down stem at the valve head for even better flow. Black nitride coating for long service life and less friction. Fits all 2.5 engines. 

34mm intake Valve P/N 1134E36R34

31.5mm exhaust valve P/N 1134E36315

 

2.5 Liter Engines and Valve Spring Retainers

High revs can drive valve stems down into the original retainers, and sooner or later cause the valves to drop through the retainer into the combustion chamber. This can destroy the piston, cylinder head and sometimes the connecting rods and block. BMW has updated the retainers on 97> cars to address this issue.   We offer two choices, the hardened BMW steel retainers or the lighter, stronger titanium retainers. 

 

Titanium Valve Spring Retainers

About half the weight and twice the strength of steel. Used in all our stage 3, 4 and full race engines. Weight 12.5 grams each.

525 (single valve spring only) P/N 11342325

 

BMW Hardened Valve Spring Retainers

P/N  11341432453

 

Korman Computer Chips

BMW's shipped from the factory are designed to run safely on a wide range of fuels. By optimizing ignition advance and fuel curves for premium fuel (92 octane or higher), significant horsepower and torque increases can be realized. Early E36's have a replaceable "plug in" P.R.O.M. chip which can be shipped to you for installation (please provide your engine control unit number when ordering). Later models incorporating BMW's anti-theft circuitry require you to send us your entire control unit for reprogramming. On all chips, the top speed limiter is raised. Rev limits increased to 7000 RPM for M3 and 325 chips, 7200 RPM for 318.

 

 

Car

Stock HP

Chip HP

Stock Torque

Chip Torque

"Plug-In" Chip

"In-House" Reprogramming

525 ECU#402

189

201

185

194

124M50100

 

525 ECU#403, 405

124M50200

 

525 ECU#413

       

124M50300

 

525 12/95>

       

 

124M50300R

 

Custom & Race Computer Chips

We have several configurations developed on our dyno for racing and custom applications. Adjustments are made for racing exhaust systems, fully prepped cylinder heads, camshafts, increased displacement, race fuel, etc. allowing you to get the most out of your engine. Call for pricing and details.

 

535i M30 "Big Six" Engine

Stock Rebuild

Our stock rebuilds are assembled to BMW specifications by our experienced and dedicated technicians rather than off a mass production assembly line. Korman engines are assembled with meticulous craftsmanship, precise machining, and detailed blueprinting. All of our boring is done with a torque plate for exceptional bore roundness and long engine life. These hand built engines are available at prices comparable to a factory reman units which offer only 12 month/12,000 mile warranties.

3.5 liter fuel injected late (89-93 E34 535) P/N 11056020

 

Korman Stage 1 3.5L Fuel Injected Engine-Late (89-93 535)

Stage 1 porting and polishing, balanced connecting rods, light weight piston pins, increased valve spring pressure, and a performance computer chip increase horsepower from 208 to 222, and torque goes from 223 lb/ft to 237 lb/ft.

P/N 11056120

 

Korman Stage 2 3.5L Fuel Injected Engine-Late (89-93 535)

Our Stage 2 for the late 3.5L includes our Stage 2 cylinder head porting and polishing, dual valve springs with chrome alloy retainers, lightened Stage 2 connecting rods, Korman Rocker Arms, and a special computer chip. Horsepower is increased from 208 to 230, and torque climbs from 223 lb/ft to 244 lb/ft. This engine is emissions legal.

P/N 11057220

Strokers/Conversions

Another way of gaining horsepower and torque without affecting emissions is to increase the displacement of the M30 engine. This option is available with all of our rebuilds, please call us with your needs.

Required main components:

  • 3.5 to 3.8-crankshaft and conversion parts

 

Performance Computer Chip

BMW

ECU#

HP GAIN

REV LIMIT

P/N

535i M30 89-93

0.261.200.179

25

6800

124M30400

 

Adjustable Fuel Pressure Regulator

This modified Bosch fuel pressure regulator allows you to adjust the fuel pressure on your 533 or 535. Increased fuel pressures can help compensate for performance modifications (chips, cams, exhaust, intake, etc.) as well as addressing some rough idle and "flat spot" problems. Improves spray patterns on older injectors.

P/N 13106020

 

 

 

Camshafts and Valvetrain Components

 

Schrick's street performance cams all give a strong increase in power across the full rev range while retaining a smooth idle. They do not require cutting for additional piston/valve clearance. They are designed to perform with the BMW original fuel injection systems.

 

M30 Schrick Camshafts

Schrick 284-284 duration, 10.9 mm lift. Smooth idle, no internal engine modifications necessary. Dual valve springs, chrome alloy retainers required. Performance chip strongly suggested.

>9/83 P/N 11386282

9/83> P/N 1138628201

 

Korman K-300 Camshafts

These popular reground camshafts feature 300 duration, 9.4 mm of lift. Due to variations in distributor drives, we must have your core in advance for machining.

P/N 11316300

 

Offset Adjustable Cam Gear

Resurfacing the cylinder head retards the camshaft timing. Use this gear to advance it back to specification. Machined for 1,3,5 and 7 degrees of offset. Can also be used to fine tune the power band of the engine.

M30 11/78> P/N 11318606

 

Camshaft Installation Kit

M30 6 Cyl. Stage 1 includes cast alloy rocker arms, dual valve springs, and chrome alloy retainers. P/N 11396430

 

Korman Rocker Arms

Lightened cast alloy rocker arms, contoured, peened and polished. Radiused to clear valve spring retainers with high lift cams. Sold each.

M30 6 Cyl. P/N 1133K256229

 

Korman Racing Rocker Arms

Similar to above, fully polished arm, pads micropolished.

M30 6 Cyl. P/N 1133R256229

 

Steel Racing Rocker Arms

If you need to turn high revs these steel rocker arms will give the reliability that aluminum can't provide. Proven durable on-track with consistent revs to 9000 and above with no failures. P/N 1133S256229

 

 

 

 

Aluminum Rocker Arm Locks

Designed to eliminate both the early style high tension and late style low tension rockershaft springs. Locks rocker arm into place with less friction loss than the OEM rockershaft springs. Minimizes the chance of broken rocker arms from rockershaft spring deflection. Weight is 20.8 grams each. Sold each.

P/N 11341M10M30

 

High Performance Dual Valve Springs

Includes center damper spring sleeve. Long life with revs to 7600 RPM. No cylinder head machining required. Fits all M30 engines.

P/N 11341204

 

Schrick Racing Valve Springs

Made to sustain very high spring pressures, very high cam lift, and extended high RPM use. Will maintain original tension four or five times longer than any other spring that we tested for BMW engines. Use with titanium retainers, sold each.

P/N 11341028 (inner and outer set, each)

 

Titanium Valve Spring Retainers

About half the weight and twice as strong as steel. Used in all our Stage 3, 4, and race engines. Weight is 12.5 grams each.

For Korman Dual Valve Springs-M30 P/N 11342002

For Schrick Racing Valve Springs-M30 P/N 11341029

 

Chrome Alloy Steel Valve Spring Retainers

Stronger than stock, used in all our Stage 2 engines. Weight is 21.5 grams each.

P/N 11342001

 

Korman BMW Valves

Swirl polished, profiled, and radiused for improved flow.46 mm intake P/N 1134K257592 38 mm exhaust P/N 1134K250129

M30 6 cyl.

46 mm intake P/N 1134K257592

38 mm exhaust P/N 1134K250129

 

Special BIG Racing Valves-M30

Special 47 mm alloy intake valve (stock is 46 mm). Fits stock valve seat, features dished design with polished surface.

P/N 11344140

 

Lightweight Piston Pins

Similar to those used in our racing pistons. Nice addition to any engine job. Ten to twenty percent lighter than stock pins, suitable for full race or street applications.

M30 6 Cyl. P/N 1125K712198

 

Korman Modified Connecting Rods

Lightened, balanced, peened, sized, rebushed, and alignment checked. About 8% lighter than stock rods. Shipped complete with new rod bolts and nuts. Sold on an exchange basis.

M30 All (each) P/N LAB11241201

 

 

M10_Race_Motor_Con_Rods_A.jpg (35659 bytes)Korman Lightweight Competition Connecting Rods

Designed for full race use, equally suitable for the street. Super strong and light alloy composition reduces the rotating mass of your engine, reduces stress forces at high RPM. About 25% lighter than stock, can be ordered in stock sizes or custom lengths for special applications.

M30 6 Cyl. (550 grams) P/N 11241500picture shows stock rod left, competition rod right 

 

Polished, Krinkle Finished Valve Covers & Intake Manifolds

Parts are cleaned and glass peened for superior paint bond. Raised ribs and BMW logos are polished to a mirror finish. Krinkle finish is baked on for eveness and durability. Can be supplied with your new engine or shipped on an exchange basis. Available in black, red or blue.

  • M30 Valve Cover P/N LAB11126035

  • M30 Intake P/N LAB11126200

 

Heavy Duty Alternator Bushings

These heavy duty polyurethane bushings replace your stock rubber units. The stock rubber bushings collapse over time causing misalignment of the alternator, resulting in a thrown belt. Look and see if your alternator is crooked, then use these improved bushings for a long term solution.

Long Bushings (4 required) P/N 12311268433

 

Engine Oiling

 

Engine Oiling System Modifications

Modification to the crankshaft and main bearings increase bottom end oil pressure, prevent oil from pooling in cylinder head at continuous high RPM operation. Kit includes special main bearings, new oil pump with sprocket and hardware. You must ship your crankshaft to us for modification.

M30 6 Cyl. P/N 11411306

 

Oil Cooler Kits

Stacked plate design coolers provide as much as 9 times the surface area as conventional tube type units.

 

Korman Remote Oil Cooler Kits

Includes cooler, remote filter adapter, remote filter mount, filter, all necessary hoses, clamps and fittings.

3"x11" Oil Cooler Kit P/N 11424002

5.75"x11" Oil Cooler Kit P/N 11424003

 

Korman Competition Oil Cooler Kit

Includes oil cooler, aircraft type aluminum fittings, stainless steel braided #10 hose, remote adapter, remote oil filter mount, filter.

3"x11" Oil Cooler Kit P/N 11424100

5.75"x11" Oil Cooler Kit P/N 11424200

 

Heavy-Duty Remote Oil Filter Mount

Extra strength for the most demanding situations. Housing machined from billet aluminum, red anodized finish. Includes AN 10 fittings, AN 12 available on request.

P/N 1142900004

 

Oil Thermostat

Works with the above oil cooler kits to facilitate quicker engine warm up.

P/N 11420111 (for Korman Remote Kits 002 and 003)

P/N 11420222 (For Korman Competition Kits, AN 10 fittings)

 

530i, 540i V8 Engine

Performance Computer Chips

BMW ECU# HP GAIN REV LIMIT P/N
530i 94-95 0.267.358.330 23 6800 124M61100
0.267.358.512 23 6800 124M61200
0.267.358.637 16 6800 124M61300
0.267.358.689 16 6800 124M61400
540i 93-94 0.261.200.404 19 6850 124M60100
540i 94-95 0.267.357.980 19 6850 124M60200
540i 1995 0.267.358.582 EWS2/Overlay 19 6850 124M60300R*

*ECU must be shipped to Korman for modification

 

Korman Roadsport Suspension Systems

Our best selling suspension package is comfortable enough for daily use, yet provides substantially improved handling for winding roads and weekend club events. Kits includes four Bilstein HD shocks, front and rear anti-sway bars with polyurethane bushings, and our Heavy Duty thrust rod bushings.

BMW

Sway Bar Diameter

Kit P/N

front

rear

525, 535 >7/90

27mm

19mm

3110535H

525, 535 8/90>

27mm

19mm

3110535H2

530i, 540i

27mm

19mm

3110540H1

Korman Clubsport Suspension Systems

Our Clubsport Suspension Systems for the E34 step up to Bilstein Sport Valved shocks and also includes 4 sport springs. Sway bars and Heavy Duty thrust rod bushings complete these packages and ensure crisp, precise control under most any circumstance.

BMW

Height Reduction

Sway Bar Diameter

Kit P/N

front

rear

front

rear

525, 535 >7/90

1.3

.75

27mm

19mm

3110535H1

525, 535 8/90>

1.3

.75

27mm

19mm

3110535H3

530, 540

1.3

1.0

27mm

19mm

3110540H2

 

Competition Adjustable Anti-Sway Bar End Links

Allows for custom tuning of front and rear anti-sway bar pre-load to suit specific track layouts. Light weight aluminum threaded centers connect right and left hand threaded joints for quick adjustments. Front links may be used singly or in pairs.

Front Adjustable Link E34 525, 535 '89> P/N 3102847

 

Heavy-Duty Thrust Rod Bushings

The E34 chassis and front end shimmy go hand in hand, especially with the addition of larger wheel and tire packages. This shimmy mimics warped rotors, and is most noticeable under light braking from highway speeds. The most common cause we see in our shop are the weak factory thrust rod bushings. These bushings are mounted at the rear of the strut rod, a diagonal link which helps prevent fore and aft wheel movement. Our hard rubber bushings address this problem as well as improving steering feel and "turn in". Sold in pairs.

All E34 P/N 3112567

 

Upper Decamber Plates

A pair of hardened aluminum plates with studs and bolts for easy installation. Increases front negative camber by about 3/4. Sold in pairs, fits all E34 models.

E34 >7/90 P/N 31062057

E34 8/90> P/N 31062059

 

Strut Braces

Strengthens chassis, minimizes strut tower deflection. Polished aluminum finish.

E34 525 M20 (89-91) P/N 3131056

E34 525 M50 (91-95) P/N 3131057

E34 535, 530, 540 P/N 3131056

 

Front Upper Support Bearings

Always replace when installing new front springs or shocks.

Offset Upper Support Bearing P/N 31331139481

Standard Upper Support Bearing P/N 31331139437

 

Rear Subframe Camber/Toe Assembly

Our eccentrics allow adjustment of rear wheel camber and toe in just a matter of minutes. Enables the restoration of factory specified alignment settings, adjustable for racing. Sold on an exchange basis.

P/N 33203567L (camber or toe only, x 2 for both)

 

Big Brake Kits

Korman Kit

Front Rotor Diameter

Front Rotor Thickness

Caliper Type

Notes

P/N

324mm Brake Conversion

324mm

30mm

4 piston Brembo

16" Wheels required

34180112

332mm Brake Conversion

332mm

34mm

4 piston Brembo Aluminum (As used on Ferrari F40)

17" Wheels required, crossdrilled rotors

34180111

345mm Brake Conversion

345mm

32mm

Ate 4 Piston

17" Wheels required, rotors are directionally vented 2-piece with aluminum hats

34180113

 

High Performance Rotors

Ate POWER DISC

  • computer designed pattern for optimal performance

  • reduced fading

  • reduced stopping distances

  • reduced brake noise

  • high performance at about the same price as a stock rotor!

Front rotor all E34 except 540 P/N 3411P160936

 

Korman High Performance Brake Rotors

Available in either a computer controlled crossdrilled version with the holes chamfered to the wear limit, or in a computer controlled gas slotted version with the gas ports milled to the wear limit. Our rotors are then finish plated with cadmium. While nothing beats the appearance of crossdrilled rotors, we suggest using the gas slotted versions for true high performance and track use due to superior wear rates and brake cooling. Please specify crossdrilled or gas slotted when ordering.

BMW

Front Rotor

Rear Rotor

E34 525, 525iT, 535i, 530i, 530iT

3411D160936

3421D162305

540i

3411D159896

3421D159659

 

High Performance Brake Pads

 

Ferodo Performance Brake Pads

Developed as a non-asbestos street alternative. Formulated with metallic fibers and other inorganic substances that yield a high friction level with good resistance to fade and wear. This competition grade compound is completely suitable for normal street use as the friction level is affected very little by temperature.

 

 

Hawk High Performance Disc Brake Pads

  • Superior Pad Life

  • High friction coefficient

  • Extremely rotor-friendly

  • Pre-bedded at factory

  • Ferro-Carbon™ friction material evaluated up to and beyond 1800 F.

  • BLUE compound for full race applications

  • BLACK compound for street and track

Korman Endurance Brake Pads

In our development of the 325 for IMSA Endurance Racing, we tested every brand name racing brake pad we could buy and then had some custom fabricated as nothing "off the shelf" would last. We finally found a custom material that was good enough to win the 24 Hours of Watkins Glen and both the Driver and Manufacturers IMSA Sport Class Endurance Championships. An added bonus is that they stop well under light street conditions, making them completely suitable for street/highway use as well as driving schools and Club Races. Sold on an exchange basis (we need your old backing plates back as cores)

 

Korman Racing Brake Pads

Developed for use in our IMSA E30 M3's. Good enough to win both the drivers and the manufacturers IMSA Sport Class Endurance Championships. This pad material is a non-asbestos graphite/metallic formulation. Unlike some racing materials that work well only when hot, the broad coefficient of friction of these pads also enable them to work well under cool, light braking conditions. They are therefore ideal dual purpose pads for both street and club events.

BMW

Ferodo

Hawk Blue

Hawk Black

Korman Endurance

Korman Racing

Front

Rear

Front

Rear

Front

Rear

Front

Rear

Front

Rear

525, 530, 535

FDB577

FDB578

HB135BLUE

HB140BLUE

HB135BLK

HB140BLK

KDB007F

KDB003R

KDR024F

KDR028R

540

FDB779

FDB578

 

Other Brake Components

Stainless Steel/Teflon Brake Lines

Essential for driving schools and highly recommended for all high performance driving. Provides stronger pedal, improved modulation under hard brake usage. Eliminates expansion associated with rubber lines. Kit includes a full set of 6 lines.

All E34 5 series P/N 34321056

 

 

 

Super Blue Racing Brake Fluid

A non-silicone high performance dot 4 brake fluid designed for the extreme demands of motor racing, yet perfectly suited for street applications. Sold in 1 liter cans. P/N SUPER BLUE  (blue fluid)   (Type 200 is a yellow version of Super Blue)  P/N TYPE200

 

 

Super Blue

Dot 4

Dry Boiling Point

536F

414F

Wet Boiling Point

392F

279F

 

 

K & N Air Filters

The K & N Filtercharger is unsurpassed in filtration protection, while maintaining an air flow greater that the OEM paper filter. Constructed of a pleated special cotton fabric with aluminum screen mesh and wide rubber seals, it comes pre-oiled with a one million mile warranty. When dirty, simply clean, re-oil and reinstall.

E34

YEAR

P/N

535

89-92

1372332573

93>

1372332059

525 M50

91>

1372332617

525 M20

89-90

1372332059

530

94>

1372332675

540

94>

1372332675

 

K&N Accessories

K&N Oil, 8 oz.P/N 13720008; K&N Cleaner, 32 oz.P/N 13720032

 

Flowtech Intake Systems-E34 530/540 & 535

Completely eliminates stock air box. New 9" cone element K&N filter is supplied with an aluminum heat shield to guard against hot air. Mounts using existing metal tabs and hardware.

530i P/N 1371V8530

540i P/N 1371V8540

535i P/N 13711735E34

 

 

Remus Free Flow Exhaust Systems

These high quality Austrian made performance exhaust systems for your BMW offer sporty sound and a nice decrease in exhaust back pressure without being too loud. All Remus systems are dyno tuned for best power and feature stainless steel inner baffles for long life. Easy installation using stock fittings and mounting points. 3 year warranty.

E34 525, 535

Front Section

E34 525, 535 Rear-Twin Round 76mm Tips

E34 525, 535 Rear-Twin Angled Tips 74mm X 64mm

1887910300

1887910504

1887910548

E34 530, 540

Front Resonator P/N

E34 530, 540 Rear Exhaust (74mm X 65mm chrome tips)

1883930300

1883930548

 

Exhaust Manifold Porting

A careful porting and polishing of the exhaust manifolds to match the diameter of the exhaust manifold gaskets.

E34 525, 535 P/N LAB18213006

E34 530, 540 P/N LAB 18213004 (2 required)

 

Ceramic Thermal Barrier Coating

Aerospace coating on both the inside and outside of the exhaust manifolds results in increased gas velocity, reduced under hood temperatures (20-30%), and combustion chamber stabilization. Additionally, rust and corrosion are eliminated by this coating which has the appearance of polished aluminum.

E34 525, 535 P/N 182110016

E34 530, 540 P/N 182110014 (2 required)

 

 

Korman Adjustable Short Shift Kit

Let's you select the shifter throw that suits your needs

  • Adjusts in minutes from inside your car

  • Accepts original or aftermarket gearshift knobs

  • Assembled unit saves on installation time

  • Adjustment locking mechanism

  • Replaceable, self-lubricating bushings

  • Includes shifter cup bushings and complete instructions

  • Easily installs in less than an hour

All E34 P/N 25250001

 

Lightweight Steel Flywheels

Precision machined and balanced steel flywheel. 35% lighter for reduced inertia and more rapid acceleration. Sold on an exchange basis.

535i P/N 11220006

525i M20 89-91 P/N 11220325

Aluminum Flywheels-525i M20 (89-91)

Precision machined on the latest numerical control lathes to ensure highest possible accuracy. Constructed of high strength, heat-treated aluminum, with a steel friction surface retained by aircraft structural screws. The insert is stress relieved, blanchard ground, precision drilled, countersunk, and heat-treated. It is far superior to spray-on type friction surfaces and can be replaced when worn. Kit includes aluminum flywheel, flywheel bolts and anti-galling plate. Total flywheel weight is 8.9 lb.

525i (228mm) P/N 11121880K

 

 

Flywheel Bolts (always replace flywheel bolts when replacing the flywheel)

525i P/N 11220616143

 

Aluminum Flywheels-525i M50 (92>)

Weigh anchor! The factory dual mass flywheel weighs 27.6 lbs. The Korman Aluminum Flywheel weighs just 10.4 lbs. This reduction in rotating mass (17.2 lbs.) allows your engine to accelerate faster at all Rpm's. Our flywheel is precision machined on the latest numerical control lathes to ensure highest possible accuracy. Constructed of high strength heat treated aluminum with a replaceable steel friction surface. Kit includes aluminum flywheel, anti-galling plate, and special flywheel bolts. Compatible with the original factory clutch set.

E34 525i M50 (92>) (228 mm) P/N 11121900K

Clutch Components

We sell only quality SACHS clutch components. Heavy duty pressure plates feature increased clamping force for better performance with high horsepower engines, bigger tires, etc. The heavy duty light weight pressure plates feature the same increase in clamping force but the center plate, normally cast iron, is replaced with lightweight aluminum for even better performance. Heavy Duty Sport Discs feature a performance grade friction surface which is both riveted and bonded for greater strength.

 

 

BMW

Heavy Duty Pressure Plate

Heavy Duty Disc

Release Bearing

525i M20

2121999618

2121268132

21511225203

 

Stock Clutch Kits

All new (no reman) kits include stock pressure plate, disc and release bearing.

 

Korman Manual Gearbox Rebuild

 

 

We rebuild your gearbox using only BMW original parts. Includes new bearings, synchronizers, seals, gaskets and labor.

P/N 232316XX

 

 

 

 

 

Differentials

 

Korman Standard Differential Rebuild

Differentials with normal wear don't usually require the replacement of the ring and pinion gears. Our standard rebuild includes complete disassembly, through cleaning, close inspection of all parts, replacement of all bearings, seals gaskets, crush sleeve and lock ring. Includes meticulous attention to correct gear lash, gear contact, precise pre-load of bearings and exact torque specifications. We expect our rebuilds to last well over 100,000 miles. Note: UPS can pick up and deliver your differential at your door!

E34 525i, 535i, 530i P/N 33126036

 

 

Korman 75% Limited Slip Differential Conversion

If you race, autocross, rally, do BMW driving schools, or otherwise tend to push your car to the limit, let us convert your 25% limited slip differential to 75% limited slip. Wheel spin is reduced or eliminated, improving track times significantly. Additionally, the reduction in internal slippage lowers lubricant temperatures, helping prolong bearing life. The conversion requires special machining at our facility, making it necessary for you to ship your differential to us for modification.

75% Limited Slip Conversion P/N 33126375

 

 

Optional Ratio Differential Gear Sets

"My first BMW, a 1964 1800 TISA four door sedan regularly beat the performance sport cars of its day in autocrosses: E-Jaguars, Lotus Elans, Corvettes, MG Twin Cams, Porsche Super 90's, and more than a few 911's! Along with very minor engine changes, a good suspension package, wider wheels and tires, and a close ratio gearbox, my most effective "speed secret" was the change to a 4.75 gear set!"

Ray Korman

 

Korman Suggested Differential Gearing

BMW

original gear ratio

suggested ratio

P/N

525i M20 89-91 5-speed

3.73

4.10

 

525i M20 89-91 Automatic

4.10

4.45

 

525i M50 All

3.23

3.46

 

535i 5-speed

3.46

3.73 or 3.91

 

535i Automatic >6/90

3.91

4.27

 

535i Automatic 7/90>

4.27

4.45

 

530 5-speed

3.07

3.46

 

530 Automatic

3.15

3.46

 

540 >3/94

2.93

3.25

 

540 4/94>

2.81

3.25

 

Call us for recommendations, pricing and more information on upgrading your differential.

 

 

Korman Autoworks, Inc. 2629 Randleman Rd. Greensboro, NC USA 27406