Quote:
Originally Posted by jspaeth
THIS is what I am talking about!!!!
However, even though that head is good for a bizzillion RPMs.....
Someone on here (that knows their shit) showed me the calculation for Mean Pistion Speed.
And apparently, the SR with stock stroke is dangerously near the "factory standard maximum Mean Piston Speed" when it is at 8500 RPM....
I like all this tech talk :-)
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Mean piston speed, with the stock stroke, @ 8500rpm, is 24.36 meters per second. Around 25 meters per second is considered the "safe" limit for a street engine. However, there are other factors to consider, such as piston acceleration (from BDC and TDC), rod angle, etc.. The SR doesn't have a large stroke, and the rod isn't super short, so, the angle isn't so severe, that it causes tons of sidewall loading. With a good set of rings, and some lateral gas porting, 8500rpm is safe for any SR bottom end, but, I would never spin one up that high unless I had a VE head to take advantage of it.