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Old 10-18-2004, 03:48 PM   #10
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Join Date: Aug 2002
Chapter/Region: NESIC
Location: Beverly, MA
2005 Big red


Originally Posted by ride5000
now, why does that occur? i think it has to do with the speed of the receeding piston during the power stroke. if the cylinder pressure peaks quickly and the piston does not have time to absorb that pressure and convert it to downward movement, then very little of that pressure will be used to perform actual work. instead it will be dissipated in the piston/rods/bearings/headgasket/rings, etc.

I was thinking along those lines on my way home.

My train of thought was like this:
At low RPM the pressure and heat generated have more time to do damage. It takes time for the heat to get into the metal parts so at lowwer RPM you have more time for the heat to get into those parts. Also the pressure or force has more time to do damage at lowwer rpm.

So it is not really BAD. You just have limits on the strength of the components. That is why it is bad. Same thing with RPM limits on rods they will only take so much and then boom.

Am I way off here?

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TheMadScientist is offline   Reply With Quote