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BMW Drivetrain Parts for BMW E21 320i M10 1.8L

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Building your perfect BMW is more than just adding horsepower and stiff suspension. Your drivetrain needs attention in order to deliver power effectively. Most BMWs feature comfortable clutch discs, heavy flywheels, long shifter throws, and open differentials. The drivetrain transmits power to the wheels, but can also be a source of power loss when it is designed for comfort rather than performance. Everything on this page will help you improve your power delivery and driving experience by providing custom Limited Slip Differentials, Short Shift Conversions, Performance Clutch Discs, Lightweight Flywheels, and anything else your BMW needs to be the perfect driving experience.

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2002, E21 320i, E30 318i (M10) JB Racing Lightweight Aluminum Flywhee...

T#:3647

Part#: 520-110-215

Ships in 3 Business Days

$ 581.00 USD

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Aluminum flywheels are much lighter than the stock steel flywheel and that produces better throttle response and more available horsepower to the wheels for faster acceleration. The JB Racing aluminum flywheels are a direct replacement for the stock flywheel and work with stock clutch components for an easy upgrade with very little downside.

Modern flywheels are built with additional components and features that are designed to dampen and minimize vibrations from the engine and transmission. As a result they have become bloated in weight and that means more energy is used up just making the flywheel spin. The weight difference between an aluminum and steel flywheel is huge - sometimes more than 50% less. Without the additional mass, more energy can be diverted to where it counts most - moving the car. The flywheel and clutch is one of the first areas that engine builders address when making the rotating assembly lighter for race engines. The dampening effect is just not needed on cars that are focused on performance.

In addition to releasing more power to the wheels, the lighter flywheel allows the engine to spin more freely, which improves throttle response. Again, the difference is huge as you watch the revs build faster than before. With the engine spinning easier the power band comes up much sooner. The stock steel flywheel feels lazy in comparison. There is a driving adjustment required to get used to how much faster the engine revs but that's not really a downside.

The JB lightweight flywheel is designed to be used with a factory organic clutch - the same clutch kit that you would get from any BMW dealer. This makes replacement clutch components easy to source and inexpensive when compared to specialized racing clutches. By using the factory BMW clutch, JB has also made the whole assembly easy to live with when used on the street. The clutch behaves the same as it originally did - just with better throttle response and more power! The JB flywheel can be rebuilt too with a new clutch contact surface.

Aluminum flywheels are considered 'single-mass' flywheels because they do not have the same dampening designs as an original 'dual-mass' flywheel. With a single-mass design more noise and vibration may be noticeable. There are steps you can take to minimize the noise - heavier weight transmission oil and clutch discs with anti-rattle springs (sprung-hub clutch).

Stock Flywheel Weight = 16.5lbs
JB Flywheel Weight = 8lbs

This item fits the following BMWs:
1974-1976 2002 BMW 2002
1977-1983 E21 BMW 320i
1984-1985 E30 BMW 318i

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CV Joint Boot Clamp Band Tool

T#:5122269

Part#: W83011

Ships in 2 Business Days

$ 23.31 USD

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$ 23.31 USD

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Helpful tool for proper axle boot installations.

Fly Wheel Turner

T#:1809145

Part#: W80510

Ships in 2 Business Days

$ 34.69 USD

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$ 34.69 USD

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For turning and holding flexplates and flywheels.

Quart & Gallon Fluid Pump

T#:5095675

Part#: W1139

Ships in 3 Business Days

$ 10.99 USD

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$ 10.99 USD

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Unique double threaded cap fits both quart and gallon size containers.

Axle Bearing Seal - Priced Each

T#:26038535

Part#: 33113604119

In Stock

Sale - Save 39% $ 3.99

This product was last offered at the strikethrough price on
05-03-2026

$ 2.44 USD

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Sale - Save 39%

$ 3.99

This product was last offered at the strikethrough price on
05-03-2026

$ 2.44 USD

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Bremmen Parts Axle Bearing Seal - ID=81mm/2mm

This item fits the following BMW chassis:

E10 E21 E30 E36 E36/7 Z3

Ear-Type Clamp Pliers

T#:1855988

Part#: W83013

Ships in 6 Business Days

$ 20.40 USD

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$ 20.40 USD

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Used on ear-type clamps found on CV joints, hoses, and some fuel filters.

Multi Use Transfer Pump

T#:1809134

Part#: W1145

Ships in 2 Business Days

$ 18.80 USD

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$ 18.80 USD

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Quickly and easily transfer any fluid.

Fluid Transfer Pump

T#:1809158

Part#: W1141

Ships in 2 Business Days

$ 10.19 USD

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$ 10.19 USD

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Fits all standard gallon bottles

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