Georgia Fiero Club Forum
All Things Fiero => Tech Tips, Tech Questions => Topic started by: Mike_21 on September 18, 2019, 05:12:12 pm
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My old chevy small block motor (Archie conversion with 5 speed) has a 2 piece rear main seal. The new motor has the 1998+ one piece rear main seal and I need a new 153 tooth flywheel to match the new crank.
Has anyone done this upgrade before and can you recommend a specific flywheel?
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I think GTXVette is a Chevy man. He may be able to provide some info. I think you have his contact info?
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We've been playing telephone tag this afternoon but haven't spoken yet. I'll keep trying.
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If you can locate one, get a lightweight flywheel. The only steel is the ring and pressure area. All else is high-strength aluminum.
You WILL notice a difference! Wallet will be a tad lighter but it's well worth it! Got one in my Firebird and it made a HUGE difference in acceleration. I don't remember the weight difference but the reduced mass is incredible.
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Back when, we used Schaefer Lightweight Aluminum Flywheels, especially on the smallblocks. And yes, there is a remarkable difference. Only problem I ever remember is that sometimes the starter ring would come off.
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I've used lightweight flywheels in a lot of motorcycles I've built. I do like a fast revving motor!
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Hmmm. We should try a lighter flywheel on the 2.8.
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Hmmm. We should try a lighter flywheel on the 2.8.
Wouldn't work on a pre-88 2.8 because of the need to balance the externally balanced crank shaft with the counter-weighted flywheel.
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I could be mistaken, but I think the Archie kit might have used a "kit specific" flywheel. Unless Archie sourced it someplace else.
Also, I believe the later one-piece-seal 305 was externally balanced. Make sure whether or not yours is the same.
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Hmmm. We should try a lighter flywheel on the 2.8.
Wouldn't work on a pre-88 2.8 because of the need to balance the externally balanced crank shaft with the counter-weighted flywheel.
Maybe on a 3.4.
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Raydar, You are correct. The single piece rear seal is externally balanced on the rear end and the flywheel is weighted. The harmonic balancer is neutral.
I spoke with Archie for about half and hour yesterday, His flywheels were custom machined for his kits. Luckily, he still had few in stock so I grabbed one!