E21 4 CYL.(M10) & 6 CYL.(M20)

ENGINE COMPONENTS

Camshafts

Please see Tech Info on CIS injection and Camshafts

Notes: (1) Use big bore throttle plate for this application. (2) Not for use with CIS injection (carbs/programmable fuel injection only). (3) Additional piston/valve clearance may be required. (4) Korman Rocker Arms, dual valve springs required. (5) Offset adjustable cam gear required (6) Weber 45 DCOE's, large diameter headers, fully prepared cylinder head required (7) Sold on a core exchange basis.

Offset Adjustable Cam Gear

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.

>11/78 (double row chain) P/N 11310006

11/78> (single row chain) P/N 11310806

Korman Rocker Arms

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

Korman Racing Rocker Arms

Similar to above, fully polished arm, pads micropolished.

M10 4 Cyl. P/N 1133R256229

M20 6 Cyl. P/N 1133R271429

High Performance Dual Valve Springs

Includes center damper spring sleeve. Long life with revs to 7600 RPM. Will fit over 79> small valve seals. Must update guides and seals on older heads. No cylinder head machining required. Fits all M10 and M20 engines. M20 requires use of our titanium valve spring retainers, below.

P/N 11341204

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 M10 and 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-M10 P/N 11342002; M20 P/N 11342003

For Schrick Racing Valve Springs P/N 11341029; M20 P/N 11341030

Chrome Alloy Steel Valve Spring Retainers

Stronger than stock, used in all our Stage 2 engines. Weight is 21.5 grams each. Will not fit M20.

P/N 11342001

Korman BMW Valves

Note: 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.

Alpina Valves-M10

Special alloy, polished dished design.

• 46 mm intake P/N 11341143

• 39 mm exhaust P/N 11341144

Special BIG Racing Valves-M10

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

P/N 11344140

Camshaft Installation Kits

• M10 4 Cyl. Stage 1

Includes cast alloy rocker arms, dual valve springs, and chrome alloy retainers. P/N 11394400

• M10 4 Cyl. Stage 2

Same as above but includes Korman Rocker Arms. P/N 11394401

• M10 4 Cyl. Stage 2 Competition

Korman Racing Rockers, Titanium valve spring retainers, dual valve springs. P/N 11394402

• M20 6 Cyl. Stage 2

Cast alloy rocker arms, dual valve springs, titanium valve spring retainers. P/N 11396420 (may substitute Korman Rocker Arms or Racing Rocker arms at additional cost) 

High Compression Pistons-M10 4 Cyl.

OE type Mahle piston sets include rings, pins and clips.

Korman BMW Racing Pistons

Our current piston dome shape is the result of years of dyno testing and successful racing. This piston makes the most power with the least tendency for detonation. Pistons come with lightweight alloy pins and clips. Requires extensive combustion chamber modification. Compression ratios to 13.5:1 are obtainable. Forged for light weight and strength. Call with your application.

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.

M10 4 Cyl. P/N 1125K712198

M10 6Cyl. 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. Sold on an exchange basis.

P/N LAB 11241201

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.

M10 4 Cyl. P/N 11241500

M20 6 Cyl. P/N 11241600 

Bosch Mechanical Advance Distributor-M10

Similar to European Ti and U.S. model Tii distributors. Specifically designed to provide a high performance ignition curve to BMW 4 cyl. single cam engines. We have tested others but found none to compare with the quality construction and performance of the Bosch distributor. Will improve acceleration and fuel economy. Expect an 8-10% acceleration improvement. Fits all models >9/79.

P/N 0231188002R

Electronic Points Conversion-M10

Replaces troublesome points with infrared trigger unit. Greatly reduces dwell variation and erratic timing. Fits all models >9/79.

P/N 0231XR700

Lifetime Warranty Bosch Ignition Wire Sets

8 mm high temperature silicone ignition wires offer excellent performance, value and durability. We use these wire sets on all of our engines with excellent results. The last set of plug wires you'll ever buy!

320>9/79 P/N 12121360603

320 9/79> P/N 12121705697

M20 ALL P/N 12121710591 (may require relocation of coil on some models)

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. Can be supplied with your new engine or shipped on an exchange basis. Available in black or red.

• M10 4 Cyl. Valve Cover P/N LAB11124000

• M10 1.8 L Intake Manifold P/N LAB 11124200

• M10 2.0 L Intake Manifold P/N LAB 11124200

• Dual Weber Manifold P/N LAB 11124100

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. Fits all E21's.

Short Bushings (2 required) P/N 12311268432

Long Bushings (2 required) P/N 12311268433

© Korman Autoworks, Inc. 1997, 1998