Flywheel help needed, emergency!
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Flywheel help needed, emergency!
You may know that I'm swapping in a 331 from a 93 mustang into my 86 2wd truck. Now, the flywheels are different I know, but the Mustang's is much smaller and weighs 23 lbs and the truck's is much larger and weighs 30 lbs. Both years 302 engine use the same balancer so is this added weight a problem? Second, I found out the hard way that the bolts I had on the I-6 300's flywheel DO NOT fit the 302 flywheel, nor do the ones from the mustang?! Is this normal? The bolts seem to be a finer thread than I have and I broke one on the new flywheel. Thanks for any help!
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From: Cantley
1968-80 302 engines were built with a 28-ounce imbalance factor.
1981-01 302 engines were built with a 50-ounce imbalance factor.
The weight shouldn't be a problem as long as the imbalance factor is the same.
The bolts are probably metric instead of SAE.
1980
F150
1981-01 302 engines were built with a 50-ounce imbalance factor.
The weight shouldn't be a problem as long as the imbalance factor is the same.
The bolts are probably metric instead of SAE.
1980
F150
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Joined: Jan 2001
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From: Virginia
The truck flywheel is possibly larger because it will take a larger clutch. The larger rotating mass also makes the engine in the truck take longer to rev up, but it has more stored energy to help the heavier truck take off without stalling.
This is one more factor to consider in the design differences between a truck setup and a small light car like a mustang. If you want the truck to accelerate quicker and the revs to rise faster, then use a lighter flywheel. If you want it to take off better under load or pulling a trailer, then stick with the heavier flywheel.
This is one more factor to consider in the design differences between a truck setup and a small light car like a mustang. If you want the truck to accelerate quicker and the revs to rise faster, then use a lighter flywheel. If you want it to take off better under load or pulling a trailer, then stick with the heavier flywheel.
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Thanks guys. The clutch is actually smaller than the mustang. It's the 10" clutch and my mustang had a 10.5" clutch. Anyway, I got the flywheel on. The problem was the flywheel holes themselves. I got a new one and thread chased the holes with a 5'16"-18 thread tap. Picked up some new grade 8 bolts at Oreilly's and voila! The engine is in the truck now and it lined up PERFECTLY! Thanks again
