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Difference of a light weight flywheel?

Old 02-10-2019, 07:53 AM
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Default Difference of a light weight flywheel?

Hi folks,

Sorry if this is a repeat. My search did not turn up much. I am still very much in the planning stages but I know I will need to buy a new clutch and flywheel when I make my swap, since the 5.0L in my '83 Mustang still has the 10" assembly (and a lot of miles on it now). I've read that in heavy cars, a heavier flywheel is an advantage - less bog off the line, etc. But a V8 Miata is far from a heavy car!! I've also read that on a light car, a heavy flywheel can actually limit acceleration. I'm wondering if anyone has gone from a stock (approx 20#) flywheel to a lightweight, and if so, what difference you noted. For my budget, it would be a big-ticket item, but I also only want to buy this once. I'm wondering if I'll see much difference.

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Old 02-10-2019, 11:46 AM
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The lighter wheel will be easier to get moving. Meaning that the engine will accelerate quicker. Nice deal in race car.

The heavier wheel will be slightly slower to accelerate. But you get smoother operation at low rpm's. Less "bucking".

If you're building a predominantly street car, stick with the stock wheel. If it's a track or autocross car, spend for the lighter one.
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Old 02-10-2019, 02:19 PM
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I agree. Stock flywheel and clutch. For a street car a heavy clutch pedal gets old quickly.
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Old 02-11-2019, 06:20 AM
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I have fidanza alum flywheel and spec clutch in my car. Pedal is not too stiff, doesn't bother me, and it's till pretty easy to get going as light weight car and V8 torque. I was all about trying to keep the nose weight down, and the flywheel is very light in comparison to stock.
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Old 02-11-2019, 12:03 PM
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All very helpful responses. Thanks!
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