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 and honing is done with a torque plate for exceptional bore roundness and long engine life. 2 year/24,000 mile warranty.
3.3 liter fuel injected P/N 11033010
3.5 liter fuel injected P/N 11056010
1988/89 635csi P/N 11056020
Korman Stage 1 3.3L Fuel Injected Engine
Our Stage 1 rebuild will provide a moderate 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 20-25 HP depending on model. Performance computer chip suggested, not required. Engine Plus Parts Included
3.3 liter P/N 11033110
Korman Stage 1 Fuel Injected Engine (85-88 635)
These engines feature increased compression, Stage 1 cylinder head porting and polishing, increased valve spring pressure and a special computer chip to take full advantage of the engine's potential. Horsepower is increased from 182 to 215, and torque climbs from 214 lb/ft to 230 lb/ft. Engine Plus Parts Included.
Korman Stage 1 3.5L Fuel Injected Engine-Late (88-89 635csi)
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.
Stage 2 Engines
Korman Stage 2 Fuel Injected Engine (85-87 635csi)
These engines feature increased compression, Stage 2 cylinder head porting and polishing, dual valve springs with chrome alloy retainers, lightened Stage 2 connecting rods, BIG intake valves, Korman Rocker Arms, and a special computer chip. Horsepower is increased from 182 to 230, and torque climbs from 214 lb/ft to 244 lb/ft. This engine is emissions legal and as smooth as the original. Engine Plus Parts Included.
Korman Stage 2 3.5L Fuel Injected Engine-Late (88-89 635csi)
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.
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:
All Korman engines are priced built on your good core
E24 Engine Components
Performance Computer Chips
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.
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 284-284º 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 300º duration, 9.4 mm of lift. Due to variations in distributor drives, we must have your core in advance for machining.
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
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.
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.
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.
Korman BMW Valves
Swirl polished, profiled, and radiused for improved flow.
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.
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
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.
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 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.
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)
Korman Roadsport Suspension Systems, Non Load Leveling
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 shorter, stronger springs, adjustable front and rear anti-sway bars with polyurethane bushings, and Bilstein Heavy Duty shocks front and rear.
Roadsport Suspension Packages, E24 with Load Leveling
We offer the option of either retaining or deleting the automatic load leveling suspension on the 635. The suspension package which allows the continued use of the load leveling system includes 25mm adjustable front sway bar, 19mm adjustable rear sway bar, a set of 4 special lowering springs and a load leveling adapter kit for the new rear sway bar.
Roadsport Suspension, Retain Load Leveling P/N 3110635H1
If you choose to remove the somewhat troublesome/expensive to repair load leveling system, our Roadsport kit includes an elimination kit, progressive rate springs, 22mm front adjustable, 16mm rear adjustable sway bars, and Bilstein Sport valved struts and shocks. The pump, resevoir, fluid lines and other components pertaining to the load leveling can also be removed after installation of this kit saving further weight.
Roadsport Suspension, Delete Load Leveling P/N 3110635H2 (larger diameter 25mm front and 19mm rear sway bars available at additional cost)
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-P/N 3102847 (fits 83> E24)
Heavy-Duty Thrust Rod Bushings
The E28 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 E24 83-89 P/N 3111567
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.
Aluminum Front Lower Control Arms
Stronger than the original cast steel arms and about half the weight. Reduction in unsprung weight improves handling.
All E24 83-89 P/N 31121310L (left) 3112310R (right)
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.
E24 >82 P/N 31062055
E24 83> P/N 31062056
Strengthens chassis, minimizes strut tower deflection. Polished aluminum finish. Front only.
E24 77-83 3126431
E24 84> 3130065
Front Upper Support Bearings
Always replace when installing new front springs or shocks.
630, 633 77-82 31331101663
All E24 83> 31331124508
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.
All E24 P/N 33203567L (camber or toe only, x 2 for both)
Big Brake Kits, 6/82-89 633, 635
High Performance Rotors
Ate POWER DISC
635 85-89, 83-84 633 Front rotors P/N 3411P156143
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.
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.
Korman High Performance Brake Pads
A superior carbon-kevlar material that far exceeds the capabilities of usual street performance pads. For road, rally, autocross and track use. Wide friction coefficient make them work well hot or cool. Rotor friendly.
Don't forget new brake pad wear sensors!
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 E24 9/81> 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
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.
E24 78-84 P/N 1372332005
E24 85-88 P/N 1372332005
635 '89 P/N 1372332573
Big Bore Throttle Body
Bore size is enlarged 3mm for a 10% increase in throttle butterfly area. Quicker acceleration and noticeably more torque throughout the midrange and top end. Especially effective when installed along with our high performance computer chip, free flow intake and performance exhaust system. Sold on an exchange basis.
633, 635i P/N 11610322 Core P/N 116163CORE
High Flow Intake System
Easy bolt on installation. Just remove the factory air filter box and install the new venturi tube. A special cone shaped K&N Filtercharger is then clamped onto the end of the venturi tube. Nice increase in throttle response, sporty induction sound. Minor drilling required. 633, 635 P/N 1371KM30
Extrude Honed Intakes
The Extrude Hone process accomplishes porting and polishing throughout the complex BMW M30 intake manifold which are inaccessible by hand tools.
ALL E24 Cylinder P/N 13EXTRUDE01
These high quality headers provide a 6-10% power increase on stock engines, much more on high performance engines. Engineered for trouble free fit and long service. Also available with ceramic thermal barrier coating (described below) for additional performance, durability and improved appearance. Headers fit manual transmission models only and include oxygen sensor fitting.
Exhaust Manifold Porting
A careful porting and polishing of the exhaust manifolds. We then precisely mate the exhaust manifold gaskets to the exhaust manifold for maximum flow. Especially effective with Ceramic Thermal Barrier Coating. An excellent alternative where headers are not an option.
All 6 cylinder P/N LAB18213006
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 6 cylinder P/N 182110016
Korman Adjustable Short Shift Kit
Let's you select the shifter throw that suits your needs
All E24 9/85>P/N 25250003
All E24 >9/85 P/N 25250004
Lightweight Steel Flywheels
Precision machined and balanced steel flywheel. 35% lighter for reduced inertia and more rapid acceleration. Sold on an exchange basis.
All E24 P/N 11220006
Flywheel Bolts (always replace flywheel bolts when replacing the flywheel) P/N 11220616142
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.
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
We rebuild your gearbox using only BMW original parts. Includes new bearings, synchronizers, seals, gaskets and labor.
Close Ratio Rebuild P/N 23231902
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!
630, 633 to 9/82 (side loader) 33126000
635 (all) P/N 33126082
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
Quaife Automatic Torque-Biasing Limited Slip Units
Already used in Formula 1, IMSA, SCCA and Pro Rally applications, Quaife Automatic Torque Biasing Limited Slip Units are now available for your BMW. Quaife units utilize a gear driven mechanical process to direct power at an infinitely variable rate (as opposed to a fixed 25%, 40% or 75% rate) to the wheel with the most traction. Unlike the more complicated and fragile Torsen design and the BMW OEM clutch pack limited slip units which tend to transfer power abruptly, the Quaife units are simple and rugged in design and provide a very smooth power transfer between the two driven wheels. Quaife units have proven to make as much a one second per mile difference in lap times on road courses. We can provide you with the unit for your own installation, or install it here in our facility.
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 Autoworks, Inc. 2629 Randleman Rd. Greensboro, NC USA 27406