E24 and E28 U.S. M5/M6 (S38B35), Euro M5 (M88), E34 M5 (S38B36 and B38)
The high quality parts and rebuilding techniques we offer in our performance engines are applied in our stock rebuilds. All parts are meticulously cleaned and inspected, the block is bored and precision honed with a torque plate for complete cylinder roundness, and pistons, bearings, oil pump, seals, etc. are replaced with OE parts. A careful hand assembly and blueprinting gives you an engine we expect to outlast the original, and at a substantial savings over a factory exchange engine. Since valve guides on the S38 engines can not be replaced, valves with oversized stems must be used in cases where wear exceeds factory specifications. These are not included in our rebuild pricing since we must inspect the old valves at teardown.
Stock Rebuild P/N 1100M560
Korman Stage 1 Rebuild
In addition to the parts included in our Stock Rebuild, our Stage 1 Rebuild adds our offset exhaust cam gear and a performance computer chip. The cylinder head is ported to Stage 1 specifications, including unshrouding of the intake and exhaust valves. Connecting rods are precisely balanced. This combination yields the following results: P/N 1101M560
Exhaust header thermal barrier coating
Korman Stage 2 Rebuild
This engine pulls hard to redline, yet is well behaved for daily driving. Special parts include a Schrick 272º cam, offset exhaust cam gear, BMW Motorsport performance valve springs, titanium valve spring retainers, and BIG intake and exhaust valves. The cylinder head is ported to Stage 2 specifications and valve bowls are enlarged to take full advantage of the larger valves. The valves are also unshrouded, further improving flow. Connecting rods are both lightened and balanced, and we apply our oiling system modifications for additional high RPM durability.
Exhaust header thermal barrier coating
Light Weight Competition Connecting Rods
Light Weight Piston Pins
Big Bore Throttle Bodies
These special engines are based on a BMW Motorsport crankshaft yielding a displacement of 3.8 liters. This conversion can be applied to any of our S38 rebuilds. All necessary hardware is supplied including our competition connecting rods.
S38 Stroker Kit (add to engine rebuild) P/N 1100M538
example: S38 B36 Stage 2 Rebuild, 3.8 liter 385hp, 343lb/ft torque
Standard 84/86mm crankshaft left, radiused and hollowed counterweights of the 3.8L 90 mm stroke crank, right
"Engine Plus" Program-M Engines
From our many years of experience building BMW engines we offer our "Engine Plus" program. Our quoted engine prices represent much more than just the essential internal parts that other businesses quote. We also include the external parts which are usually in need of replacement. Typically, these tune-up and maintenance parts represent over $700.00 of our package prices. All of our rebuilds include these NEW parts where applicable.
In the event that you have just replaced one or more of the above items which are included in your rebuild and prefer to re-use the part, it will be deducted from your invoice.
In engines subject to extreme wear it may be necessary to replace some of the following additional parts. The cost of these parts is not included in our engine quotations unless specifically noted.
Our goal is to provide you with an engine that will offer many miles of driving pleasure with no unexpected surprises.
S38 Valve Cover and Plenum Set
BMW initially offered the Evolution M3's with a valve cover and plenum painted white with Motorsport stripes. These were manufactured by various vendors for BMW, all with one recurring flaw, they turned yellow with heat and age. They were also sold separately for a short time by BMW but at a high price, since you were purchasing both a new valve cover and plenum PLUS the special paint job.
Modeled after the M3 S14 valve cover and plenum sets, we are now able to offer our own special paint service to M5 and M6 customers without requiring the purchase of new parts. Your valve cover and plenum are chemically stripped, cleaned, and glass peened to remove all traces of old paint. A special high temperature, self-etching, self-leveling epoxy primer is applied, followed by high temperature epoxy color coats. As a final step, a high temp non-yellowing clear coat is applied. Please note that each casting is unique and some have more pitting and flaws than others. These casting flaws may not be completely hidden by the painting process, just like the originals. These are special order parts, full payment is required at time of order, no refunds or exchanges. If you are sending your valve cover to us, ask your salesperson for an estimated time of completion. We have had these in service for over 7 years with no yellowing, fading, cracking or peeling.
P/N 99MSPTVCS38, core P/N 99MS38VCORE
Korman Stage 1 Performance Kit
These kits offer the best horsepower per dollar increase available for your M5 or M6. Kits include performance computer chip, offset exhaust cam gear and camshaft lock plate.
Performance Computer Chips
As used in our Stage 1 Performance Kit above.
Offset Exhaust Cam Gear
Retards cam timing for a noticeable increase in torque from 2000-4000 RPM. Can be used alone but is most effective when combined with our performance computer chip.
B35 (>88 M5, M6) P/N 11311312M28
Lock Plate for exhaust cam gear P/N 11311305070
Unsurpassed power for your big M engine. Euro engine requires machining of cam carrier for lobe clearance. All engines may require adjustments to valve stem length or lash caps to achieve proper adjusting range. May be installed singly or in pairs. When installed singly, use the 272 as an intake on the M88 and S38 B35 engines, 280 as an intake on the B36.
P/N 1131M056272-272º duration, 11.0 mm lift
P/N 1131M056280-280º duration, 11.0mm lift
BMW Motorsport Valve Springs
Increased pressure for high performance applications. Enables the engine to rev higher without the fear of valve float. Springs are sold in pairs and include 1 inner and 1 outer spring.
Titanium Valve Spring Retainers
Half the weight and twice as strong as stock steel retainers. Allows quicker revs, higher RPM's. Weight is 12.5 grams each.
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.
All M5 and M6 P/N 1125K712103
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.
S38 All (each) P/N LAB11241205
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. Can be ordered in stock sizes or custom lengths for special applications.
M30 6 Cyl. (550 grams) P/N 11241500
Engine Oiling System Modifications
Increases oil pressure to the engine's bottom end, provides more even flow and pressure to rod bearings. Controls oil flow to cylinder head, reducing oil pooling during high rpm operation. Kit includes special main bearings and charges for modifying your crankshaft.
OEM style wire set complete with loom and coil cap.
E24, E28 M5/M6 P/N 12121307171
Bosch Ignition Components
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
Roadsport Suspension Systems
Our Roadsport Suspension Systems are available for cars which came equipped with the load leveling rear suspension. These kits offer improved handling through the use of shorter, stronger springs and larger, adjustable anti-sway bars. Ride is firm and controlled, but still suitable for daily use. These kits come complete with the necessary hardware kit for keeping your load leveling connected.
Clubsport Suspension Systems
Our Clubsport Suspension Systems offer greatly improved handling with a very firm, controlled ride. Bilstein Sport Shocks, more aggressive spring rates and stronger anti-sway bars give you complete control in any situation. For cars equipped with load leveling, we include the necessary components which allow you to use conventional rear shocks. Additional weight savings can be realized by removing the oil pump, reservoir and other unneeded load leveling components.
Competition Adjustable Anti-Sway Bar End Links
Allows for custom tuning of anti-sway bar pre-load to suit specific track layouts and to facilitate corner weight adjustments. 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-P/N 3102847
Heavy-Duty Thrust Rod Bushings
Front end shimmy and vibration which mimic warped rotors are a common problem with the E28, E24 and E34 chassis cars. The addition of larger wheel and tire packages often accentuates the problem. The most frequent cause we see in our shop are the worn 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 E24, E28 M5 and M6 P/N 3111567
E34 M5 3112567
Remember to check the condition of the entire front suspension as well as wheel balance/tire roundness and rotor run out/thickness when trying to diagnose a shimmy.
Fixed Upper Decamber Plates
A pair of hardened aluminum plates with studs and bolts for easy installation. Increases front negative camber by about 1º. Sold in pairs.
E28, E24 M5/M6 P/N 31062056
E34 M5 P/N 31062059
Polyurethane Adjustable Camber Plates
Allows easy adjustment from the top of the car. For use with stock springs. Harder material improves handling and responsiveness.
Strengthens chassis, minimizes strut tower deflection. Polished aluminum finish.
E24, E28 M5/M6 FRONT P/N 3131055
E34 M5 FRONT P/N 3131056
Front Upper Support Bearings
Always replace when installing new front springs or shocks. Sold each.
E24, E28 M5/M6 P/N 31331124508
E34 M5 P/N 31331139437
Offset Upper Support Bearings
Increases negative camber for improved handling and tire wear. Sold each.
E24, E28 M5/M6 3131143
E34 M5 P/N 31331139481
Offset Rear Trailing Arm Bushings
Used to make very small corrections in rear wheel camber or toe. Sold in pairs.
E24, E28 M5/M6 P/N 332202203
Adjustable Rear Polyurethane/Eccentric Bushings
Replaces your rubber bushings with locking eccentric type. Kit includes a set of (4) bushings allowing adjustment of both camber and toe.
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, and are adjustable for racing settings. Sold on an exchange basis.
E24/E28 M5/M6 P/N 33203567L (camber or toe only, x 2 for both)
Big Brake Kits
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.
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
*Next best to our Endurance Pads. Excellent for short races, good brake air ducts required.
Korman High Performance 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. Not recommended for full race use.
Korman Endurance Racing Brake Pads
Developed by BMW Motorsports specifically for endurance racing. Tested and proven on our IMSA Endurance Series M3 CSL and 328's. Nothing else comes close.
Don't forget new brake pad wear sensors!
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.
E24, E28 M5/M6 P/N 34321056
E34 M5 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.
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. Fits stock air box with no modifications required.
E24, E28 M5/M6 P/N 1372332559
E34 M5 1372332617
K&N Oil, 8 oz. P/N 13720008
K&N Cleaner, 32 oz. P/N 13720032
Big Bore Throttle Bodies
Enlarging the throttle butterflies alone does little to improve intake flow or performance. After installing 48mm butterflies (+2mm), our big bore throttle bodies are enlarged through their entire length. We then port and match the air horn assemblies and intake gaskets for best flow. Most effective when combined with other engine modifications. Sold on an exchange basis.
All M5/M6 P/N 1161048016
European Exhaust Headers
For E28 M5/E24 M6. Equal length headers designed and manufactured by BMW Motorsport GmbH. Improved flow offers power increases on any engine, especially effective when combined with other performance modifications. Factory catalytic converter requires modification for use with this header. Shown with ceramic coating
P/N 11621307250 (cyl. 1-3), P/N 11621307251 (cyl 4-6)
Ceramic Thermal Barrier Coating
From Aerospace technology comes this oven baked metallic/ceramic finish that is far superior to ordinary header paints. In salt spray testing where high temperature paints lasted 40-50 hours, the ceramic coating lasted over 5,000 hours. The ceramic thermal barrier finish also coats the inside of the pipe. The thermal barrier will reduce underhood temperatures and testing has shown horsepower gains due to combustion chamber stabilization and increased gas velocity.
All M5 and M6 P/N 182110016
Supersprint Stainless Steel Performance Exhaust-E34 M5
Reduced back pressure offers improved sound and performance. Mounts using existing hardware and mounting points. Low, aggressive tone, dyno tuned for best power.
Front Resonator P/N 18837114634
Rear Muffler P/N 18837196695
Stainless Steel Performance Exhaust-E24, E28 M5/M6
Twin 3" tips, 100% stainless steel construction. Very strong sound, suggested primarily for autocrossing or club events. Somewhat loud for everyday use, but extra power when you need it on the track.
Korman Adjustable Short Shift Kit
Let's you select the shifter throw that suits your needs
E28 M5/M6 >9/85 P/N 25250004
E28 M5/M6 9/85>P/N 25250003
E34 M5 P/N 25250001
Sachs High Performance 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.
Sachs OEM Type Clutch Kits
Kits include pressure plate, clutch disc and release bearing.
E24, E28 M5/M6 P/N 21210000007
E34 M5 P/N 21210000008
Lightweight Steel Flywheels-E24 and E28 M5/M6
Precision machined and balanced steel flywheel. 35% lighter for reduced inertia and more rapid acceleration. Sold on an exchange basis.
E24, E28 M5/M6 P/N 11220056
Flywheel Bolts-Always replace torque to yield bolts when removing or replacing the flywheel. E24, E28 M5/M6 P/N 11220616142 (ea.)
Stainless Steel Braided/Teflon Clutch Hose
Replace your cracked rubber hose with our more durable stainless steel braided unit. Improved clutch feel and modulation when compared to OE rubber line.
Korman Manual Gearbox Rebuild
2 year/24,000 mile warranty
We rebuild your gearbox using only BMW original parts. Includes new bearings, synchronizers, seals, gaskets and labor. Please supply your transmission model number when requesting rebuild information.
P/N 23231900 Getrag 280 6/86>
P/N 23231901 >6/86
Korman Standard Differential Rebuild
2 year/24,000 mile warranty
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!
E24, E28 and E34 M5, M6 P/N 33126082
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!"
Korman Suggested Differential Gearing
Call us for recommendations, pricing and more information on upgrading your differential.
We recommend Redline Synthetic Lubricants for your BMW's Driveline
Items in this category can be found in the respective chassis catalog sections, E24, E28 or E34
© Korman Autoworks, Inc. 2629 Randleman Rd. Greensboro, NC USA 27406