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*blackedoutharley* · 11-06-2010, 05:00 PM

The only "downside" to the heavier flywheel in a truck application is trying to hold it in place while you start the bolts as you lay under the truck, LOL.

My truck has a 45lb flywheel and you can almost take off from idle. This is behind a healthy small block using a 12" clutch and the original SM420.

In drag racing we always wanted the lightest flywheel possible because it allowed the engine to rev freely. Because I launched at 4800 rpm there was no need to slip the clutch. This was using an 11" clutch and I simply sidestepped it.
In the dragster we used a 10" multidisc clutch. It was light to allow the engine to rev quickly.

For an example of the use of a heavy flywheel think Harley.... The heavy flywheel in a heavy vehicle converts the energy from inertia or centrifugal force to rotational energy which moves the car.

If you take the flywheel from a factory manual trans v-8 Nova and compare it to the flywheel from a manual trans v-8 pickup I would bet the truck flywheel is much heavier.

11-06-2010, 05:00 PM	#22
blackedoutharley Account Suspended Join Date: Jul 2007 Location: Plumas Lake, Ca. Posts: 1,009	Re: 3.73 gear swap for ???? The only "downside" to the heavier flywheel in a truck application is trying to hold it in place while you start the bolts as you lay under the truck, LOL. My truck has a 45lb flywheel and you can almost take off from idle. This is behind a healthy small block using a 12" clutch and the original SM420. In drag racing we always wanted the lightest flywheel possible because it allowed the engine to rev freely. Because I launched at 4800 rpm there was no need to slip the clutch. This was using an 11" clutch and I simply sidestepped it. In the dragster we used a 10" multidisc clutch. It was light to allow the engine to rev quickly. For an example of the use of a heavy flywheel think Harley.... The heavy flywheel in a heavy vehicle converts the energy from inertia or centrifugal force to rotational energy which moves the car. If you take the flywheel from a factory manual trans v-8 Nova and compare it to the flywheel from a manual trans v-8 pickup I would bet the truck flywheel is much heavier.