car revv'n out at 7000 help?!?!
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Originally Posted by kane.s2k,Dec 15 2004, 06:40 PM
If you wanna go back to my statement on piston to wall clearance. They're made of 2 different alloys. The pistons are probably made of a 4XXX series aluminum alloy and the walls maybe out of iron or steel or something. The 0.001" cyl. wall clearance is measured at room temperature. I mean...sure 40 degrees less in temperature wont have a huge impact on dimentions, but it could be enough to cause piston slap. Aluminum expands/contracts more than steels (dont know about iron...i'd have to look at my textbook) per degree. So you say there's no problem...but you never know.
I agree with your technical proof that cold starts cause wear. What you are failing to give any evidence for is why the wear is significantly greater with higher piston speeds. I think it is plausable to say that it is the number of passes that the piston makes while cold that will determine the amount of wear.
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The original question was answered quite early to the author's satisfaction. What follows has gotten into a pissing match about some tangental philosophy. So as friends don't continue to club each other to death, I'm closing this now. Thanks to all who contributed.
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