How much does a stock cast iron flywheel weigh?

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Mike92GT

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#1

• Nov 12, 2005

• #1

Anyone know how much a stock 5.0 flywheel weighs, or do you have one laying around that you could throw on a scale? I'm trying to compare stock vs. steel vs. aluminum. I thought billet steel was lighter then cast iron, but I'm not so sure now. If the steel flywheel is gonna be heavier then what I have now, then I'm going aluminum for sure... I think steel is around 25lb, iron is 21lb or so, and alum is 13?

 

5spd GT

"the 5.0 owns all"

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#2

• Nov 12, 2005

• #2

Stock flywheel is 21lbs

 

Black1987Stang

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#3

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Theres a big debate on this on here, 5spd gt had wrote out a good explanation on the pro's and con's of all 3. It should still be on the first page.

 

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1990LXDropTop

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#4

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• #4

Go aluminum hands down

 

Black1987Stang

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Not to hijack but do billet steel flywheels come in different wieghts (ex.32oz. or 50oz. ) and whats the difference between internal balance and external balance?

 

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1990LXDropTop

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87stangdiddle said:

Not to hijack but do billet steel flywheels come in different wieghts (ex.32oz. or 50oz. ) and whats the difference between internal balance and external balance?

Click to expand...

All Fidanza flywheels come with a 28oz and 50oz weight that you screw on. Not sure about other brands...

 

Black1987Stang

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Nov 13, 2005

#7

• Nov 13, 2005

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Anyone else? and is there a way to tell what oz. weight flywheel i have. I have a Billet steel flywheel with a weight on the back held in by a allen bolt, i dont see any markings on it?

 

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Mike92GT

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Nov 13, 2005

#8

• Nov 13, 2005

• #8

I think it depends on the brand, but the weight on a 28oz flywhell is about 4" long and the weight on a 50oz flywheel is about 7" long as far as I know

 

Black1987Stang

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#9

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ok thanks Mike, what does a normal 302/306 take a 28oz. or a 50oz.? What would happen if you put a 50oz. flywheel on an engine that takes a 32oz. or vice versa? I got my billet steel flywheel off a 308? (.040 over) could this possibly be wrong for my 306? Neither of them are a stroker.

 

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Mike92GT

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#10

• Nov 13, 2005

• #10

Normal 302 / 5.0 roller moter uses a 50oz flywheel. If you use a 28oz on a 50oz motor your engine will be out of balance and you'll have a bad vibration, which can damage the bottom end. 302/ 306/ 308 should all be 50oz