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Heavy flywheel has more potential energy due to wt (archive)

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Posted by (m) -Texas M3/4 on February 02, 2001 at 18:32:17:

In Reply to: Re: Please explain the 5th gear issue (more) posted by PM3 on February 02, 2001 at 17:08:50:

((This is a over-generalization))
If you are at a constant speed both flywheels are turning the same rpm. Lets say the stocker weighs 24lbs and the ltw weighs 12lbs.

To get to a higher speed you need more Force. Force = mass x acceleration. If we wanted to double our Force (lets call it 2F) we would need would have this: Remember the flywheels are already spinning at the same rpm.

2F = 24lbs x a
2F = 12lbs x 2a (downshift to get more rpms)

From a stop it works in reverse. The ltw doesn't require the additional energy it takes to get the heavier flywheel up to the same rpms as the lightweight. Thus it spins up faster.

I still don't understand why it would affect the 5th gear acceleration in a negative. You're dicsussion it being a factor while maintaining it's 'heavy' motion, which is understandable, but 5th gear acceleration is still acceleration.
Otherwise, I think it would be like saying pushing a 2-ton Caddy from 80mph to 100mph takes less effort than a light, small CRX with the same force, because the CRX has a tendency to slow down quicker. Yes the Caddy will maintain it's momentum (as will the heavier flywheel), but if you wanna pass with a lighter flywheel, we're back to talking about acceleration, which is from any speed, not just zero. I had the 10.5-lb flywheel for 2 years and 22k miles, with 8 track events. Never had an idling problem or anything as well. Throttle response in all the gears was dramatically more noticeable (which I don't understand how it would hinder the acceleration, if it responded[and BEGAN to accelerate] quicker) in all gears, with a noticeable increase in acceleration in 1st and 2nd gear. CYA>PM3

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