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Originally Posted by russellw
I'll pass on the OHV vs OHC debate - I personally couldn't care less as long as it goes hard.
However on the topic that was started here I am surprised that anyone thinks 7,000 rpm is that high for an OHV design. Those who follow the Nascar circus will have noted the gradual increase in RPM limits on the super speedways to the point where RPM in excess of 9,000 is now a common sight - and for 4 hours on end. This is up over 1,000 RPM on a year ago and some of their engine builders are predicting a similar increase in the next 2 years. There are also surprisingly few failures in either the top or bottom end of these motors although when they do fail they do it in a big way.
Cheers
Russ
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Yes but they're only designed to last 5-6 hours... true. The lighter-weight components they use in their qualifying engines help the engines rev even higher but they'll blow within an hour under race conditions.
In F1, it's much the same story.