E30 Engine

The M20 engine group was introduced in the late 70's in 2.0L and 2.3L sizes in the European model BMW 320/6 and 323. A later 520 sedan combined the fuel economy of the small six with the convenience of a 4 door sedan.

With consumer demand for more power, engine size was increased to 2.5 L, and in the E30 chassis, electronic fuel injection powered the 323 and 325 versions. In the shadow of another fuel shortage BMW developed the ingenious 2.7 L eta engine which came to the U.S. in the 1983 528e and '84 325e. The engine was designed for minimum friction loss, highest possible fuel efficiency and maximum low rpm torque. In comparison, the 2.7L eta produces 170 lb/ft of torque at 3250 rpm, whereas the 2.8L 528i produced the same amount of torque but at 4500 rpm.

The 2.5 and 2.7L engines were strong and successful. In 1986 a BMW 325iS prepared by Linder with support from BMW Motorsport won the European Group A Championship and in the United States the Korman Autoworks 325e won the 24 Hours of Watkins Glen and the 1986 IMSA Endurance Driver and Manufacturers Championships. The Director of BMW Motorsport GmbH, Munich, Wolfgang Peter Flohr, wired a message of congratulations saying "The headline,'Korman's BMW Wins 24 Hour Race' is for BMW Motorsports GmbH a highlight which we tried to achieve in the United States for years and which goes without saying to your account only."

Everyone says they want more torque but horsepower still sells. When the 325iS came to the U.S. it had less torque (164 lb/ft @ 4300 rpm) but and increase of 41 horsepower at an enthusiasts 5800 rpm. It quickly became much more of a favorite than the low revving but efficient eta model. The 325iS made its own racing mark. In 1989 a 325iS entered by Le Team with engine and suspension by Korman Autoworks scored another win in the Watkins Glen 24 Hour Race. The primary competition R&D program for Korman Autoworks in 1993 was to develop the BMW 325iS for the SCCA IT series. The new model was an immediate front runner, overturning the previous dominance of Nissan and Mazda. The BMW won all but one race of the season, breaking lap records everywhere, and ran away with the Mid Atlantic SCCA ITS Championship!

Now almost 20 years after our 24 hour race win we are still building strong, reliable M20 street engines as well as club racing competition motors. This long time span attests to the popularity and endurance of this BMW.

From our many years of experience building BMW engines we offer our "Engine Plus" program. Our 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 $450.00 of our package prices. All of our rebuilds include the following 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 pricing unless specifically noted.

Our goal is to provide you with an engine that will offer many miles of driving pleasure with no unexpected surprises.

E30 325/318 Complete Engines

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.

As above, but includes 2.0L conversion to provide the "punch" missing from the 1.8L engines. Headers are included (check local laws for legality). High compression pistons, special valve work, and Stage 1 head porting yield 140 horsepower. P/N 110B3180

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. 325e P/N 11036410 325i P/N 11036510

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 flywheel, while M20 "eta" engines receive our exchange lightweight flywheel. Korman performance computer chip required. 325i P/N 11036350

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 (except for 325e). 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. 325e P/N 110364C0 325i P/N 110365C0

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. 325i P/N 11036650C

The 2.7L 325 eta engine is the ultimate in smooth, very high torque, ultra efficient performance. But the light nodular iron cast crankshaft and light valve spring pressure limit this pleasure to about 4850 rpm. 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 one of our staff for suggestions and pricing for any applications not listed.

Our 327e series engines are special versions of the eta 2.7 motors. The 327i series are stroked special versions of the 325i 2.5 motor.

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.

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)

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

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!

BMW	Year	ECU #	Plug In P/N	Conversion P/N	HP Gain
318is	90-91		124M42100		12
325e	1984			124M20100C	24
325e, es	84-87	5 021, 027, 24pin	124M20200A		24
325e, es	84-87	021, 027, 28pin	124M20200B		24
325e, es	88	154	124M20300		17
325i, iS	87-88	153	124M20400		15
325i, iS	89-97	173, 380	124M20500		15

This modified Bosch fuel pressure regulator allows you to adjust the fuel pressure on your 318i or 325. Increased fuel pressures can help compensate for performance modifications (cams, exhaust, intake, etc.) as well as addressing some rough idle and "flat spot" problems. P/N 13106020

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.

· Schrick 272-272º 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 288-288º 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

· Schrick 284-284º duration, 9.5mm of lift. Dual valve springs and chrome alloy retainers required. P/N 11384284

· Other profiles including 292, 304, 316, 328 and 336 are available for the M10 engine but require changing to carburetion or stand alone engine management

M10 4 Cyl. Stage 1 Includes cast aluminum alloy rocker arms, dual valve springs, and chrome alloy retainers. Designed to work with original BMW cam. P/N 11394400

M10 4 Cyl. Stage 2 Same as above but includes Korman Rocker Arms. Valve springs designed for Schrick performance cams. P/N 11394401

M10 4 Cyl. Stage 3 Competition Korman Racing Rockers, Titanium valve spring retainers, dual valve springs. Designed for Schrick cams. P/N 11394402

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

Lightened cast alloy rocker arms, contoured, peened and polished. Radiused to clear valve spring retainers with high lift cams. Sold each. M10 4 Cyl. P/N 1133K256229 M20 6 Cyl. P/N 1133K271429

Similar to above, fully polished arm, pads micropolished. M10 4 Cyl. P/N 1133R256229 M20 6 Cyl. P/N 1133R271429

Includes center damper spring sleeve. Long life with revs to 7600 RPM. No cylinder head machining required. Fits all M10 and M20 engines. M20 requires use of our titanium valve spring retainers, below. P/N 11341204N

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 M10 and M20 engines. P/N 11341028 (inner and outer set, each)

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.

Stronger than stock, used in our M10 Stage 2 engines. Weight is 21.5 grams each. Not for M20 motors. P/N 11342001

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.

47mm intake and 39mm exhaust valves profiled for max flow of hardened stainless steel. For street or racing. Get the best out of your motor. 47mm intake P/N 1134K662 39mm exhaust P/N 1134K664

Resurfacing the cylinder head retards the camshaft timing. Use this gear to advance it back to normal. Machined for 1,3,5 and 7 degrees of offset. Can also be used to fine tune the power band of the engine. 78> (single row chain) P/N 11310806

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.

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. M10 4 Cyl. P/N 1125K712198 M20 6 Cyl. P/N 1125K712120

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. M10 318 P/N 11241200 M20 325 P/N 11241203

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. M10 4 Cyl. (550 grams) P/N 11241500

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.

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

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

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. M10 4 Cyl. P/N 11411320 M20 6 Cyl. P/N 11411206

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

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

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

The commonly used cast aluminum adapters are known to split open (usually when the engine is fired up cold). Our remote adaptor is machined from solid aluminum billet and is tapped for aeroquip type oil line fittings (1/2" NPT) and also tapped for both oil pressure and oil temperature sending units. AN10 fittings included (2). And 12 available on request. Fits all M10 318engines. P/N 11414077R

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

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.

For installation to original BMW filter housings. Fits M10, M42/44, M20. Cast aluminum housing. P/N 114202526

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

7mm high temperature silicone wire sets offer performance and durability. M20 wire set includes loom (wires preinstalled)

BMW	Distributor Cap	Rotor	Super Spark Plugs	Platinum Spark Plugs
318i	1203212	1204038	WR9DC (7512) (.032")	WR9DP (4220)
325e	1203195	1204156	WR9LS (.028")	WR9LP (4237)
325i	1203195	1204156	W8LCR (7509) (.028)	W8LPR (6234)

M10 4 cyl.	M20 6 cyl.
46 mm intake P/N 1134K254625	42 mm intake P/N 1134K708895
38 mm exhaust P/N 1134K251063	36 mm exhaust P/N 1134K708896