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Tech Question
Rob C, Oakland, CA, 340
There is an argument raging about rpm limits on 340's with stock two bolt mains; some say 8200+, and while never saying never, I'd have to see some more hard data before I'm a total believer.
Care to weigh in with your opinion?
Rob-
It's not that easy. Lots to consider. Just at a glance...
First of all, reciprocating weight factors in. And, to an even larger extent, so does HP production. Much over 500-550 HP, the cylinder walls split open (unless the jackets are filled with concrete.)
Then there's the bizarre pushrod-to-lifter angle deal. Wanna get scared? Look at this running on a Spintron with a strobe lamp.
Sure, say one guy spins his to a bazillion RPM and it hasn't blown up (yet.) Even if true, that's not really hard data. You'd need a heavily instrumented block measuring deflection, etc. And/or empirical evidence of HUNDREDS that haven't blown up.
Bottom line: The factory usually said 72-7400 was max. I concur. Even then, the bottom end had better be right.
Rick
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