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Nice shot of a knife edge crankshaft.(nt)

Guest Anonymous

By Guest Anonymous,
in BMW 2002 and other '02

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Guest Anonymous

Guest Anonymous

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But it can be done by most specialized machine shops. I supplied that picture so that a shop knows what to do.

Cost is usually around $500/$600.

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Guest Anonymous

Guest Anonymous

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It is made for reducing the rotating masses. It gives better accelerations and less stress on mechanical components.

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Guest Anonymous

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One thing I hope everyone is aware of. Reducing the same amount of weight at a greater circumfrence will have a greater effect on inertia. So, a lightweight flywheel and lightweight wheels and tires would be the place to start.

Playing with the crank can have effects not intended. Since you are reducing the counterweights, their resistance to change in acceleration as each cylinder fires changes. A shortening of expected engine life is a definate maybe to consider with this modification. But it sure is cool!

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... on the torque curve. I have seen several dyno sheet denoting that side effect. The inertia that helped start the car in movement is gone, so the motor gets a bigger RPM drop too...

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