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 Flywheel 215mm
2002, E21 320i, E30 318i (M10) JB Racing Lightweight Aluminum Flywhee...
JB Racing - Corporate Logo
T#:3647
Part#: 520-110-215
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$ 581.00 USD
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$ 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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South Bend Stage 1 Heavy Duty Clutch Kit - BMW E21 320i
South Bend Stage 1 Heavy Duty Clutch Kit - BMW E21 320i
For vehicles with a production date up to 09/1982
South Bend Clutch - Corporate Logo
T#:22394055
Part#: KF137-HD
Ships in 1 Business Day
$ 377.99 USD
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$ 377.99 USD
Free Shipping on orders $49 and up
Add to Wish List
A heavy-duty upgrade to the stock O.E. clutch, this version features a pressure plate with enhanced clamp load for extended durability. The dual-dampened disc ensures smooth engagement and helps prolong transmission life, while premium friction material promotes rapid heat dissipation, further enhancing clutch longevity. Ideal for spirited driving and everyday use. Product Features: Alignment Tool Included: Yes Clutch Disc Quantity: Single Clutch Usage: Performance Disc Diameter: 210 Disc Material: Organic Disc Style: Full Face Flywheel Included: No Hub Style: Sprung Input Shaft Diameter: 1.13 Input Spline Quantity: 10 Mounting Hardware Included: No Pilot Bushing Included: No Pressure Plate Style: Diaphragm Prop 65 Yes/No: No Throwout Bearing Included: Yes Throwout Bearing Style: Standard Quantity: Sold as a kit
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