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Old 08-02-2002, 08:14 AM
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Post Cracked piston rings!!

I thought I might ask this here. Last year I had to tear down a 64' Vett's 327 that I WAS going to use in my 67' Firebird till the install shop dropped it and cracked the starter mounting ear. I was able to start it a few times and it ran great..no smoke. While taking it apart on at least 6 pistons the rings were broken into many pieces. What would of caused that to happen?

Tim

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Old 08-02-2002, 01:38 PM
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I would say improper gap or clynder bore not true.Also were the cylinder bores oiled on the first startup dry start could probably do that.On a new motor after I gap the rings I put um on the piston and dip the whole thing in motor oil and coat the cylinder walls in oil.
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Old 08-03-2002, 08:52 AM
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Maybe the machine shop didnt bother removing the carbon ring around the bore top? A wear ridge will biuld right there and can cause many problems simialer to yours. espeically if the crank has benn modified or the a longer stroke has been used or even a new set of pistons.
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Old 08-03-2002, 09:46 AM
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was the part of piston that is in between the rings also broke? I've had this happen a couple
times, low grade fuel, to-hi-comp of piston,to
much timing,to high rpm's. I've got a 428, and
2-different times, dish pistons or change heads to lower comp.ratio to 9:5:1
My firebird is 67 convertible, 428 HO,4-speed
3:55 limited slip
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Old 08-03-2002, 09:52 AM
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Tapered bores, excessive side clearance in the ring groove, excessive bore clearance, heavy detonation are all problems that can crack rings. Typically a worn engine will wear the bores tapered which then stresses the rings and eventually cracks them, this was much more common with old fashioned cast non-nodular iron rings. Stainless or chrome or chrome/moly rings almost never suffer this fate.
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