We started our M3 engine development with U.S. M3 chassis numbers 001 and 002 in February, 1987. We have modified hundreds of these cars for street/autocross/club event use, and built more than a dozen M3's for professional racing. We are now busy building for BMW Club Racing customers.   Korman is also the only builder/entrant to win in an E30 M3 in the IMSA Endurance Series. With our close technical relationship with BMW Motorsport, Munich, our in-house dyno testing and Super Flow flow bench cylinder head testing, we have learned what works and what doesn't.

We offer rebuilding to original factory specifications and many combinations of performance packages too numerous to list here. We have built 2.3, 2.4, 2.5, and 2.7 liter M3 engines, and for many reasons have found that the 2.5L offers the best combination of power, reliability, smoothness and cost. We can't match the torque of the new 6 cylinder M3's, but with our 2.5L engines in the lighter weight E30 chassis, we can beat the E36 in power to weight ratio. Customers with our special 2.5L engines regularly beat E36 M3's in autocrosses and club races.

Korman S14 2.3L Stage 1 Rebuild

Includes our Stage 1 Performance Kit (high flow Evolution 2 air intake system, K&N air filter, computer chip, and offset exhaust cam gear) and 5 angle performance valve seat/valve work, radius and contour the intake and exhaust ports, and our modified oil pan baffle.  Engine Plus Parts included.  2 year/24,000 mile warrantyP/N 11028500A

Korman S14 2.3L Stage 2 Rebuild

Includes all of Satge 1 plus BMW Motorosport intake cam (264 deg, 10.55mm lift), high performance valve springs, lightweight flywheel, lightened and balanced connecting rods, light weight pitson pins, titanium valve spring retainers, and additional port and combustion chamber work.  Engine Plus Parts included.  2 year/24,000 mile warrantyP/N 11028500B

Korman 2.5 Liter Engines

Our 2.5 Liter "stroker" engines are built around genuine BMW Motorsport pistons and crankshafts,  not cheap imitations.  The benefits of using these original parts are improved power and longevity, and reduced oil consumption.    

Korman S14 2.5L Stage 1 Engine

Very substantial low and mid-range torque increase pulling rapidly to top end. Includes special alloy 87mm crankshaft with radiused, lightened counterweights, hollowed throws, and hardened, stronger front pulley bolt. Special 95mm pistons, 95mm head gasket. Also includes our Stage 1 Performance Kit (Evolution air box kit, K&N Filtercharger, exhaust cam gear), and a custom 2.5 computer chip, oil pan baffle kit. Cylinder head ported to Stage 1 specifications. Completely balanced and blueprinted. Engine Plus Parts included.  2 year/24,000 mile warranty

P/N 11028510

All the features of our Stage 1 above plus Evolution intake cam, Motorsport valve springs, Motorsport lightweight flywheel, Stage 2 cylinder head porting and polishing, lightened connecting rods, light weight piston pins, and larger (38.5mm) intake valves. The reduced reciprocating weight of this package allows the engine to rev very quickly. Engine Plus parts included.        P/N 11028520                                               

Left: Korman 2.5L Stage 2 Engine with Big Bore Throttle Bodies(stock peak HP 187@6500 RPM, stock peak Torque 169@4000 RPM)

We also build many other S14 variants which are too numerous to list here.  All stages of the engines above are available in 2.0 liter, 2.3 liter, and 2.5 liter configurations.  Full Group A engines and hybrids utilizing similar components, programmable fuel injection and ignition or carburetion are available depending on your series specifications.  Contact us with specific performance goals and series rules for an engine quote.

Korman Stage 1 Performance Kit-214 HP

The best horsepower per dollar upgrade available for your M3. Kit includes a performance chip developed on our dyno, BMW Motorsport Offset Exhaust Cam Gear for increased mid-range power, Evolution lower air filter housing/intake horn assembly, and a K&N Filtercharger. Components also available separately

P/N 11124700

Korman Evolution Sport Kit-225 HP

This high performance kit was developed with the technical assistance of BMW Motorsport, Munich. This is the strongest, emissions legal package you can just bolt on your present engine and with no loss in mid-range power. Includes the Stage 1 kit plus Motorsport intake cam (264º, 10.55mm lift), 16 high performance dual valve springs, lightweight flywheel kit. Revs rapidly to 7400 RPM. Components also available separately

P/N 11124753

The S14 engine produces makes the most power with an intake cam which is more aggressive than the exhaust cam.  This allows you to mix and match to suit your power needs and budget.  The Evo 2 and Schrick 276 cams are suitable for use with a stock exhaust cam.  If you decide you want more power in the future, move your Evo 2 or Schrick 276 to the exhaust side and install an Evo 3 or Schrick 284 on the intake side.  

BMW Motorsport Evolution Camshafts

Developed by BMW Motorsport GmbH engineers for all around power and drivability.  As used in our Evolution Sport Kit, above. 

Evolution 2 264° duration.  P/N  11311311821

Evolution 3 272° duration. P/N 11311317004

Schrick Cams provide unsurpassed performance for your BMW.  Highest quality materials, precise machining and dyno tuned profiles.

Street Camshafts

Schrick 276 11.3mm lift, 276° duration.  P/N 1131M003276

Schrick 284 11.5mm lift, 284° duration. P/N 1131M003284

Schrick 292 12.0mm lift, 292° duration P/N 1131M003292

Race Camshafts

Schrick 320/308 Race Cam Kit

For full race applications only.  P/N 1138320308.  Includes the following components:

·         Schrick 320 Camshaft 13.0mm lift, 320° duration P/N 1131M003320

·         Schrick 308 Camshaft 12.2mm lift, 308° duration P/N 1131M003308

·         Mechanical Tappet P/N 11382713803

·         Intake Valve 39mm P/N 11341200

·         Exhaust Valve 32.5mm P/N 11341201

·         Upper Retainer P/N 11341031

·         Lower Retainer P/N 11341032

·         Keeper P/N 11342200

Schrick Racing Valve Springs

For use with Schrick race cams, above.  Must be used in conjunction with Schrick upper and lower retainers.

·         Outer Valve Spring P/N 11342064

·         Inner Valve Spring P/N 11342113

Offset Exhaust Cam Gear

As used in our Stage 1 Performance Kit. Retards exhaust cam timing for improved low and mid-range torque. 

P/N  11311312M28  (Lock Plate, 1 required P/N   11311305070)

Big Valves

Original BMW Motorsport Big Intake Valves

38.5mm intake valves as used in the 2.5L Evolution 3 M3's and Korman performance engines. Stock size is 37mm. Sold each. P/N 11341315507

Korman Stainless Steel Intake and Exhaust Valves

Custom made valves  Includes new keepers, sold each. 

Intake-38.5mm-P/N  11341315508

Exhaust-32.5mm-P/N  11341315896

BMW does not supply replacement valve guides for the E30 M3 engine.  The procedure to remedy worn guides is to ream the guide and install a new valve with an oversized stem.  These are readily available from BMW, but at a premium price.  

We have replacement valve guides made to our specifications, allowing you to avoid the expense of valves with oversized stems.  Our guides are manufactured from the highest quality materials, and have the stop ring integrally machined, doing away with the hard to install factory circlip.  

Professional installation required, as is a complete valve job after installation.  

Replacement Guide-Each-P/N 1112M000356

Replacement  Guide Installed in your cylinder head-each-P/N 11121266799

Titanium Valve Spring Retainers

About half the weight and twice the strength of steel. Weight: 12.5 grams each.

P/N 11342016

BMW Motorsport Valve Springs

Stronger than stock, designed for high RPM use. Install with no modifications.  P/N 11341312702

Special Valve Spring Shims

Used for correcting installed height/seat pressure on reworked cylinder heads. 

• .25mm P/N 11342203145

• .5mm P/N 11342203146

• .75mm P/N11342203147

• 1.0mm P/N 11342203148

Lash Caps

Install on valve tip, reduces clearance between cam and adjusting shim in special applications.  Hardened with oil hole, for 7mm stems.  Thickness .085”/2.16MM.  P/N  11342099

Korman Rental Tools for Easy Cam and Spring Installation

These tools eliminate the need to remove your cylinder head to install performance cams and springs, saving you time and money. Available to Korman customers only with purchase of our cams and/or springs. Rental fees are minimal, deposits are substantial due to the high cost of these tools. Instructions included.

M-Valve Spring Removal Tool Rental P/N 88886113000; Deposit P/N 88886113002

M3 Cam Installation Tool Rental P/N 88886113010; Deposit P/N 88886113012

Korman Stage 2 Connecting Rods

Glass peened, lightened, balanced, rebushed.  Includes new rod bolts. As used in our Stage 2 Engines. Your original rods re-worked to Korman Specifications.

P/N  11241205

Steel Alloy Connecting Rods

Strong, lightweight steel alloy construction. For full race use or for an ultra-quick revving street/autocross motor. Includes special high strength rod bolts.  Sold outright, priced each.  As used in our competition engines.

P/N 11241800

Light Weight Piston Pins

Up to 14 grams lighter than stock wrist pins for reduced reciprocating weight.  Especially beneficial for continuous high rpm use.  P/N  1125K712103

Korman Modified Oil Pan Baffle Kit

Inexpensive, easy to install insurance against a damaged or destroyed engine. Under hard cornering and on long high speed turns, engine oil will climb the sides of the oil pan and away from the oil pickup. Our kit includes a modified oil pan baffle which keeps the oil concentrated around the oil pickup, and a new lower oil pan gasket. Sold on a core exchange basis.

P/N 11133003, CORE P/N 11133CORM

Competition Oil Pan Kit

A much larger cast aluminum lower oil pan that extends nearly to the frame on both sides and adds about two quarts more oil capacity. Additional vertical and horizontal baffles with three one-way flapper valves control oil surging and keep oil at the pickup under hard cornering and heavy breaking. The larger size requires removal or relocation of the A/C compressor.  P/N 11133113

Engine Oil System Modifications

Our special crankshaft and main bearing modifications increase bottom end oil pressure and flow. Cylinder head oil pooling under high RPM is also greatly reduced. Kit includes special main bearings, our oil pan baffle kit, and modification of your crankshaft.

P/N 114110M3

High Performance Canton Mecca Oil Filters

In extensive testing, these filters trapped smaller particles than any other tested, and their high flow design required less horsepower to pump oil through the filter.  Most filters caused a 5-6 psi pressure drop, we measured only 1 psi drop on these.  The strong aluminum canister contains a replaceable filter element.                      

Spin On Filter-For installation to original BMW filter housings. Cast aluminum.  P/N 114202526

Replacement Elements-Each  P/N 114202600

Replacement Elements-6 Pack  P/N 114202602

Replacement Seal Kit  P/N 11420999

Group N Hard Rubber Engine and Transmission Mounts

Reduces engine and transmission movement under hard cornering and heavy braking. Both transmission and engine mounts must be changed together. Kit includes 2 engine, 2 transmission mounts.

P/N 11810003

Ignition Wire Set

OE style with plastic loom included, red "evo style" wires.  Priced considerably less than factory replacement sets.   P/N 12121311803

Bosch Ignition Parts

M3 Distributor Cap    P/N 12111309797

M3 Rotor    P/N  12111309798

Bosch Spark Plugs

Track Plugs-Colder heat range plug for sustained high RPM operation.  Not suitable for street use.  P/N  XR4CS  

Street plug  P/N  X5DC

Heavy Duty Alternator Bushings

Replace your soft stock bushings with these much firmer poly bushings. Eliminates canting of the alternator which causes drag, belt noise, uneven bearing load, and thrown belts. Sold each, 4 required.

P/N 12311268433

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 healthy price, since you were purchasing both a new valve cover and plenum PLUS the special paint job.

We have been offering our own version of these special valve covers and plenums  to our in-house 2.5 liter engine customers for several years, but can now produce them in sufficient volume to offer them to our mail order customers as well.  Your valve cover and plenum are chemically stripped, cleaned, and glass peened to remove all traces of paint.  The problematic plenum chamber fitting is drilled, tapped and bolted in place. 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.  Though not shown in the photo, the plenum chamber receives the stripes as well, per our archived photos of the originals.  

These special valve covers and plenums are available on an exchange basis (deposit required) if you don't want your car out of service during the process.  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.

Valve cover and plenum painting-P/N  99MSPTVC/PN

Valve cover and plenum core charge- P/N  99MSPTVCORE 

A complete line of standard rebuild, tune up and high performance parts are available from Korman Autoworks, though too numerous to list here.  Call us with your parts needs.