Quote:
Originally Posted by Wonderboy
Welcome to EM, TimG! Thank you for the input. Now I'm back on the fence again. I PMed johnny mullet about this issue - hopefully he'll reply and put the last nail in this coffin.
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FWIW -
It's a gas seal, sure, but I don't think it really needs precision due to the pressures involved. I think that under the combustion/compression pressures, the rings will likely "close" themselves, especially at the speeds they normally travel up and down the cylinder bore.
You also have to remember that gasses will always take the path of least resistance... combustion gasses won't like changing direction 3 or more times to get through the filed ring, so you're not likely to lose much of anything.
No ring is totally sealed, either. There's always going to be
some blowby, which is part of the reason that racers use gas porting on their pistons.
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