Flywheel, I am confused

robl110 · May 6, 2010

I have been doing research on flywheels for the last 2 days but I am still confused. I have a 90 LX with a vortech S-trim, 3:73 rear gears and its putting out 420 rwhp. I cruise in the car on nice weekends, it will probably never see a track. I have been informed that I need a 157 tooth 50oz imbalance flywheel. I was going to pick up a used ford racing aluminum fw for $70 but now I am wondering if I should go with a billet steel. I should also mention that with my current set up I have traction issues. I plan to put on some DR's this summer that should help.

Questions:
What does "imbalance" mean? I see plenty of flywheels for sale that are 50oz but only a few say they are imbalance.

Billet steel or aluminum for street use with some spirited driving on the back roads? I should mention that once my wife learns to drive a 5spd she may take the car out sometimes too.

Any recommendations on brands?

Thanks, Rob

stykthyn · May 6, 2010

go with a stock 50oz flywheel. There are basically two balances out there. 28 and 50. some of the earlier 302/351 assemblies ran off a 28oz flywheel and balancer. The 302HO uses the 50. It sounds like you are building a weekend cruiser so going aluminum if you can get it at a good price may not be bad, but if you are spending on a new unit a stock flywheel will do just fine at your power levels.

SScott · May 6, 2010

^Agreed^ "imbalance" is something you ride in when you get hurt real bad I think. =) I never understood why people use that word??? It really means "not in balance" or "out of balance". (I hope, I didnt Google it this time) =)

BigmacK192 · May 6, 2010

SScott said:
^Agreed^ "imbalance" is something you ride in when you get hurt real bad I think. =) I never understood why people use that word??? It really means "not in balance" or "out of balance". (I hope, I didnt Google it this time) =)

That's the correct definition Scott. haha

stykthyn · May 6, 2010

imbalance refers to the offset of the weight used to balance the flywheel. Some engines were balanced internally requiring weights to the crankshaft and balancing by the motor builder were a must. production assemblys are designed to run the already balanced flywheel and balancer with the weights welded on from the factory.

robl110 · May 6, 2010

The imbalance makes sence now. Basically all the .50oz are imbalance they just don't use that old term =)

I can pick up the ford racing aluminum one tonight for $70 but it still needs to be turned. I may give it a try.

SScott · May 6, 2010

Sounds like a pretty good deal

robl110 · May 6, 2010

So I searched a few parts places and googled Ford Racing Aluminum flywheel and came up with zero. Did Ford Racing make an aluminum flywheel at one time?

Is there any other parts I should pick up before doing my new clutch disc and flywheel?
Like an ARP flywheel bolt kit and/or clutch pressure plate bolt and dowell pin kit.

Thanks, Rob

SScott · May 6, 2010

Here it is: Ford Racing Performance Parts - [Part Details]

robl110 · May 6, 2010

SScott said:
Here it is: Ford Racing Performance Parts - [Part Details]

Of course I looked every where but the Ford Racing site

Thanks Scott!

Mustang5L5 · May 6, 2010

I would be wearily of buying a used al flywheel. At the very least, before you buy it, call a few places and ask for cost to resurface it. Some places won't touch it and others may be expensive.

Inspect the flywheel to make sure it's not warped as well

Flywheel, I am confused

robl110

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stykthyn

I want to measure mine. It doesn't look that tall.

SScott

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BigmacK192

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stykthyn

I want to measure mine. It doesn't look that tall.

robl110

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robl110

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robl110

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Mustang5L5

That is…until I whipped out my Bissell

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Flywheel, I am confused

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I want to measure mine. It doesn't look that tall.

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I want to measure mine. It doesn't look that tall.

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That is…until I whipped out my Bissell

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