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Wikipedia says: "For a solid body described by a mass density function, ρ(r), the moment of inertia about a known axis can be calculated by integrating the square of the distance (weighted by the mass density) from a point in the body to the rotation axis: 
where - V is the volume occupied by the object.
- ρ is the spatial density function of the object, and
- r = (r,θ,φ), (x,y,z), or (r,θ,z) is the vector (orthogonal to the axis of rotation) between the axis of rotation and the point in the body."
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- Um... Riiiiiight....
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- What that means is that trying to speed up things that spin sucks up energy that you should be using to go faster. The heavier the spinny thing is and the faster it spins, the more energy it sucks up. Heavy, fast spinny things are slow, mkay? One of the heaviest, fastest spinning things you have is the crank pulley. The stock crank pulley weighs in at a tubby 5.7lbs. This Kartboy lightweight crank pulley barely tips the scales at 2.4lbs. That's less than half and we like things that are less than half. When you take something that spins 7,000RPM and more than halve its weight, good things happen. The engine will rev faster in both directions, making shifting faster. There won't be as much energy stored in the pulley, so the car will accelerate more quickly. "But wait!", you say, "If you go too light, the ECU gets mad and sets off a misfire CEL!". Well, Kartboy is way ahead of you on this one. The 2.4lbs crank pulley is light but not too light, substantially reducing the risk of a CEL. Win.
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