2002 Driveline

Korman Adjustable Short Shift Kit

Let's you select the shifter throw that suits your needs.

All 2002 P/N 25250002

 

 

Lightweight Steel Flywheels

Special milling and lathe cutting reduces weight by 35%. Precision balanced. Allows the engine to accelerate more rapidly. Prices are for modifying your flywheel. For a new lightweight flywheel call for price for your model/year.                                                             

P/N 11220230                                                                                    

 

Aluminum Flywheels

Precision machined on the latest numerical control lathes to ensure highest possible accuracy. Constructed of high strength, heat-treated aluminum, with a steel friction surface retained by aircraft structural screws. The insert is stress relieved, blanchard ground, precision drilled, countersunk, and heat-treated. It is far superior to spray-on type friction surfaces and can be replaced when worn. Kit includes aluminum flywheel, flywheel bolts and anti-galling plate. Total flywheel weight is 8.9 lb.

2002 (to 9/73) 228 mm Aluminum Flywheel  P/N 11121828K

2002 (9/74 up) 215 mm Aluminum Flywheel P/N 11121800K

 

 
 

 

Flywheel Bolts

Lightweight steel flywheels should be installed with new flywheel bolts.

  12 X 28 mm flywheel Bolts 2002 (to 9/73) (8 needed) P/N  11220616142

  12 X 22 mm flywheel Bolts 2002 (9/74 on) (8 needed) P/N 11220616143

 
Special Clutch Parts

Modified engines and wider tires place an increased load on clutch components. Heavier duty assemblies are recommended. BMW 2002’s used a 228 mm clutch until 1974 when a smaller 215 mm clutch became standard. These models especially need stronger clutches. We use only new Sachs clutch parts – no rebuilt units. Sachs manufactures the original equipment clutches for BMW, Porsche, Mercedes, etc. Note: for later models with 215mm clutch components, you must convert to a 228mm flywheel to utilize the heavy duty clutch components         

Heavy Duty Pressure Plate All 2002, Tii 228mm P/N 2121063031

 

Heavy Duty Light Weight Pressure Plates

The center plate, normally cast iron, is replaced with a hardened aluminum plate with a bonded friction surface. The reduced inertia forces enable quicker acceleration. The heavy-duty springs prevent slippage under increased torque loads. Unbeatable when combined with our Lightweight or Aluminum Flywheels.

BMW Model Clutch Size All 2002, Tii 228mm P/N2121051001

 

Clutch Discs

The friction facing of original equipment discs is riveted only. These heavy-duty units have high performance facings both bonded and riveted for greater strength. Use the spring-loaded heavy duty discs for all sport driving that includes street usage.

Spring Loaded Disc with Heavy-Duty Lining All 2002, Tii 228nn P/N 2121168132

 

Sachs OEM Standard Clutch Kit

Packaged conveniently for you. Each kit includes a new Sachs pressure plate, clutch disc, and release bearing.                                                    

2002 to 9/73, All 2002 Tii P/N 21210000001

2002 9/73 onP/N 21210000002

 

Sachs Clutch Release Bearings

>69 P/N 21511200628                                                               

69-9/73 & All Tii P/N 21511204224

9/73  P/N 21511204225

 

 
Lightweight Racing Clutch/Flywheel Kit
Race only kit includes ultra lightweight aluminum flywheel (7 lbs.), light weight 7 ¼” (184mm) double disc clutch assembly and special release bearing.  The lightest, strongest package available for your M10 engine.

 

P/N 2121800LW

 

 

 
 
 
 
 
Transmissions

 

Our standard gearbox rebuilding includes complete disassembly, thorough cleaning, and close inspection of all parts. We replace the synchro rings, bearings, seals and gaskets with original BMW parts. Other worn parts are replaced as needed at additional cost. The transmission is blueprinted, shimmed, torqued and pre-loaded precisely to BMW specifications using the correct BMW special tools for each task.

We have read that BMW gearboxes have inherent weaknesses in bearings and synchros. In over 39 years of experience with BMW gearboxes, we can not agree with that opinion. We typically race all season with the same stock BMW gearbox and usually only change the synchros during between season winter rebuilds. We race several seasons on the bearings some claim are weak, and with engines double the original horsepower!

 

Korman offers rebuilds warranted for 2 years/24,000 miles for all BMW transmissions, from the old BMW Porsche-type synchronizer gearboxes to the newest M3. And, you'll be surprised how much you can save over a factory reman unit!

 

 

 

Korman 2002 Transmission Rebuild with 2 year/24,000 mile warranty                          

P/N 23231400

 

Heavy-Duty Engine/Transmission Mount Kit

The rubber engine and transmission mounts of the 2002 and 1600 allow excessive engine movement under sport driving conditions, and sometimes break. Our kit includes stronger heavy-duty rubber mounts for the engine, both left and right sides, one stronger transmission mount, and a modified right side steel mounting bracket.                                                                                                                           

P/N 11810002

 

Special Transmission Mounts

Heavy duty mount for BMW 1600/2002                                                                                      

P/N 23233100

 

BMW Five Speed Overdrive Gearbox Conversion Kits

These complete kits allow you to install a later model five-speed overdrive gearbox into your early model four-speed BMW. The first four gears are nearly identical ratios as your original four-speed. Fifth gear drops engine speed 20% for improved highway fuel mileage, less engine wear, and less noise.

 

Our kit includes a BMW remanufactured five-speed gearbox and necessary shift linkage, shift support, and shifter bushings. The price includes the cost of shortening and re-balancing your present driveshaft, which you must ship it to us. If your original driveshaft is not useable, we will furnish a new driveshaft at additional cost.                                                                                        

2002 (up to ’74) P/N 2323520273

2002 ('74 – up)  P/N 2323520274

 

Five Speed Close Ratio Gearboxes

Close ratio gearboxes are designed primarily for competition usage. First gear is geared higher than in a standard four speed or overdrive five speed transmission. Fifth gear in a close-ratio box is the same (1:1) as fourth in a four speed or overdrive five speed. The closeness of the ratios requires much more shifting but keeps the engine rpm up in the peak torque ranges for maximum acceleration.            

P/N 2323120025

 

Prices are for exchange gearboxes. We can accept your rebuildable 4-speed in exchange.

Differentials

 

Differentials with normal wear do not usually require replacement of the ring and pinion gears. Our standard rebuilding includes complete disassembly, thorough cleaning, close inspection of all parts, replacement of all bearings, seals, gaskets, crush sleeve, and lock ring. Our rebuilding includes meticulous attention to correct gear lash, gear contact patterns, precise pre-load of bearings and exact torque specifications. We provide a 2 year/24,000 mile warranty with our rebuilds, but expect them to last well over 100,000 miles.

 

If you have a limited slip differential, we can also refurbish the limited slip carrier while rebuilding your differential (additional charges apply). As BMW limited slip units wear, the percentage of lock (25%, 40%, etc.) gradually drops off. We can restore your limited slip assembly to original lock, or increase it to 75% for performance applications. The reduction in slippage will lower your differential lubricant and bearing temperatures as well as your lap times!

 

If you want to change your differential gearing or add a Quaife unit, combining these operations with a rebuild saves you both time and money.

 

Rebuilding Of Stock Differentials

Korman 2002 Differential Rebuild with 2 year/24,000 mile warranty.                               

 P/N 33124000

 

Korman Competition Rear Covers

Finned aluminum rear cover with ported aluminum air dam for extra cooling. This cover, when used along with Redline Synthetic Lubricant, provides proven reliability under full racing or autocross conditions without the need for a differential oil cooler. Price is for modifying your differential cover.

P/N 33121002

Differential Components

 

 

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!"

 

Ray Korman

 

 

Racing Teams use different gear ratios to suit the characteristics of each track and obtain maximum acceleration. Successful autocrossers know the advantages of a quicker ratio, but as a street/highway performance option it is often overlooked. This may be because it seems more difficult than

changing computer chips or adding a suspension package. Also, many local shops and even dealers lack the special tools and expertise to rebuild and change gear sets in BMW differentials. With our racing experience we are very proficient with BMW differentials and we have the special tools needed to make modifications correctly. UPS and other carriers have increased their weight limits and can now pickup and deliver your differential at your front door. The usual diff removal or installation time for most BMW's is 1.5 hours.

 

Changing to a quicker ratio provides faster acceleration in all gears at all rpm's. It does not affect engine emissions or idle speed and can make up for changes in tire diameter. Some BMW models were originally geared very long for increased fuel mileage. These cars benefit the most from quicker ratios. Generally, longer ratios yield better fuel mileage and shorter ratios offer more acceleration and higher fuel consumption. In practice, the fuel difference is often slight. If you have such a long ratio you must frequently downshift to pass or accelerate quickly, then in reality you do not get the theoretically higher fuel mileage that the longer ratio would have you expect. And, if you switch to a shorter ratio for more acceleration, you may not burn much more gas than before, as you are now able to upshift more quickly into the higher gears.

 

In a similar way, you would expect that changing to a shorter ratio for more acceleration will reduce your top end speed and you would run out of revs in high gear. However, few cars have enough top end torque to pull full revs in high gear. Changing to a shorter ratio will usually enable the engine to pull more revs against the high speed drag resistance. Though you will turn more revs per mile, your actual top end speed may be as good or better than before, especially if you have added some additional performance improvements.

 

The following formula will enable you to calculate your possibilities, but keep in mind actual results will vary. Drag, rolling resistance, tire characteristics, spoiler packages and engine modifications all affect acceleration and achievable top end speed. And don't forget road conditions, speed limits, and radar! It is usually more practical to gear for greater acceleration than higher top end speed. You can enjoy it more often with fewer penalties.

 

 MPH=  (RPM)(TIRE DIAMETER) in inches

                (GEAR RATIO)(336)

 

Korman recommends a +/- 9% gear ratio change for most street driven cars. To obtain a percentage change, divide your original gear set ratio by your proposed new gear set. The resulting percentage also equals your RPM change at a given speed.

 

Korman Suggested Differential Gearing

2002 with 4 speed change stock 3.64 to 3.90

2002 with 5 speed overdrive change stock 3.64 to 4.22

2002 with 5 speed close ratio change stock 3.64 to 3.90

Available ratios:

3.45:1  P/N33124345

3.64:1  P/N33124364

3.90:1  P/N 33124390

4.10:1  P/N33124410

4.22:1  P/N33124422                 

 

 

Call us for pricing and availability on differential gear changes

 

© Korman Autoworks, Inc. 1997-2006