High volume oil pump at what clearances?
07-18-2008, 01:50 PM
#16
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Join Date: Feb 2003
Location: Mooresville, NC
Posts: 2,640
Some engine builders like bigger clearances for very hi-po motors. The idea is that there is more deflection and that a thicker oil film will minimize metal to metal contact under these circumstances. That's they way my machine shop does it and it makes sense to me. I can't say if it's true or not though.
Rich
Rich
And for not perfectly machined parts... like my Eagle crank!
07-20-2008, 08:59 PM
#17
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Join Date: Aug 2007
Location: Purgatory... Also known as New Jersey.
Posts: 316
I guess that makes sense, that's what we used to to in the machine shop I learned/worked in. But we usually reserved that for pretty potent motors; stockish stuff got stock clearances. Hell, I built a 357 c.i. chevy motor that made about 615 HP in a drag car that ran 9.70-9.80 and that was at stock clearances with 10w30 synthetic oil so I didn't have as much oil pump loss / spark scatter. That engine lived through over 100 passes before I sold it and as far as I know the guy who bought it is still running it. Only thing it needed changed regularly was valve springs about once a season. Before I sold it I swapped out the bearings, and they still looked pretty damn good.
As far as the eagle crank situation - I would've either sent it back or if that wasn't possible, sent it to a crank grinder to get straightened out.
As far as the eagle crank situation - I would've either sent it back or if that wasn't possible, sent it to a crank grinder to get straightened out.
Some engine builders like bigger clearances for very hi-po motors. The idea is that there is more deflection and that a thicker oil film will minimize metal to metal contact under these circumstances. That's they way my machine shop does it and it makes sense to me. I can't say if it's true or not though.
Rich
Rich
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