3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

Why resurface a flywheel?

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Old Apr 7, 2004 | 04:35 PM
  #1  
Ville H. Valo's Avatar
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Why resurface a flywheel?

ok, i am finally getting a new clutch and i want to know why anyone would buy a NEW flywheel when you could just have the old one resurfaced, is there an advantage to getting a new one. i need to know before i order, ASAP!!!! thanks

-Ville
Old Apr 7, 2004 | 06:12 PM
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sure. its a new part. id rather have anything new then used. advantages would be new non worn teeth and you dont have to worry about it being warped in anyway. other then those 2 reasons, theres nothing wrong with used wheels. plus if your going to have it out anyways, might as well replace it. not everyday you drop a tranny
Old Apr 7, 2004 | 06:58 PM
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If the flywheel is warped you're better off going with a new one. If the only problem is glazing or hot spots, resurfacing is fine.



My T56 flywheel cost me $300 so you better believe I'll have it resurfaced until it's too thin to cut.
Old Apr 7, 2004 | 09:21 PM
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Ville H. Valo's Avatar
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yeah, i just have enoght cash to get a new clutch, the resurface sounds like the way to go. BTW i am getting a stage 2 SPEC clutch, what do you guys think? i have an oem clutch now, the last owner was a bit retarded.
Old Apr 7, 2004 | 10:32 PM
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Stephen 87 IROC's Avatar
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I change a lot of clutches in highway trucks. We send the flywheel out to be resurfaced even if it looks fine. A resurfaced flywheel makes it perfectly flat and true plus it gets rid of any glazing.

The downside is that if they need to grind off too much to make it flat again, the flywheel could go below the minimum specs. It's just like machining drums and rotors. Once they get too thin, they become dangerous and need to be replaced.
Old Apr 8, 2004 | 12:03 AM
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If you go with a new flywheel you have other choices as well. You can get different materials, lightened versions, etc... But those options aren't cheap of course.
Old Apr 8, 2004 | 12:15 PM
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You'll like the SPEC clutch a lot. I went with a Stage 3 when I swapped in the T56 and absolutely love it.
Old Apr 8, 2004 | 01:50 PM
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Surfacing could get rid of some of the hot spots unless they are way too deep. If you have a good flywheel, you can have it surfaced provided it doesn't get too thin for your liking.
Old Apr 8, 2004 | 03:32 PM
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Originally posted by Stephen 87 IROC
We send the flywheel out to be resurfaced even if it looks fine. A resurfaced flywheel makes it perfectly flat and true plus it gets rid of any glazing.
My shop does the same thing.

Many people just put in a new clutch kit and don't bother with the flywheel. Then they wonder why their new clutch chatters and slips

Advantages for a new flywheel? Less runout (usually) for one. No need to shim it like you would with a cut flywheel. A warm fuzzy feeling inside knowing that you did the job CORRECTLY. Much like cutting brake rotors, cutting a flywheel is acceptable, but is not the preferred method. You're compromising safety. Thinner = weaker.
Old Apr 8, 2004 | 04:56 PM
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If they were to cut it down to before the specified thickness, would it really be compromising very much tho?
Old Apr 8, 2004 | 06:26 PM
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I'm assuming you just ment below specified thickness.

It's the same as brake rotors. They have a minimum thickness for a reason. If they're too thin they will warp when heated up and a flywheel can get just as hot. If they're too thin they can't disipate heat properly. If they're too thin, especially a flywheel, it can crack and explode and that's not a pretty picture. If a flywheel is too thin it also affects the clutch adjustment.
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