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A smaller Crank shaft pulley lowers the time spent rotating to maximum revolution. Basically the lighter weight, and smaller diamater of the racing pulley, let the crank rotate and rev faster. Ther is a slight HP increase.
What I truly dislike about the available aftermarket pulleys for 240s, is that they are not harmonic balanced. Basically they are a precise machined metal that has no rubber harmonic dampner on them. This in turn reflects harmonic distortions back into the crank. So there fore the crank is sending out distortion, and the pulley is reflecting it back, and not dampening the harmonic vibrations. Can you say metal fatigue?!
Over a period of time crank failure can occur. Cranks flex and give in a certain range of flex as in design, but the harmonic dampner on the stock pulley compensates for most of that.
I for one have seen what a NON dampend crank pulley can do to a healthy motor. Not pretty. Pieces of crank everywhere.
The gains from a racing crank pulley are minimal, some where in the .1 second, and 1mph gain in the 1/4 mi.
If and only if an aftermarket crank pulley were dampened, then I could recomend you buy it. Other than that, focus on Intake, exhaust, ECU, cams, and various little things that don't mess with your internal combustiion cycle and in a grevious manner.
Mr. Rose: ANTI-PULLEY
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