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Message: <blockquote data-quote="fabianyee" data-source="post: 317480" data-attributes="member: 6">Put it into application and you find that you've only touch on a small part of it... Yes, there's a noticeable increase in mid range torque with thicker shaft or even a heavier flywheel. However, as the rpm increases. the extra weight becomes a burden... It requires more effort to rotate the extra mass/weight. On the other hand, if the flywheel or shaft is too light, it'll lose mid end torque but better high rev power... If you examined the Honda VTEC high rpm engines, you'll find that the rotating components are very light, especially the flywheel. Hence the free revving characteristic of the engines and high horsepower. However, with light rotating mass, it compromised on the mid and low end torque. So the argument on thicker(or heavier) shaft to increase torque is correct only to an extent and it doesn't increase horsepower. In fact, it reduces the horsepower especially max power since peak power is delivered at high RPM..</blockquote>