"Scott" wrote in message
.. .
Well, maybe reliability for one or two races might be thought about. I
guess what I was alluding to was that I wouldn't think an engine built for
racing would have a high TBO compared to our slow turning tractor engines
(Lycoming, Continental, etc.).

Scott



That's true with many of the high performance techniques. Mult-angle valve
jobs, high lift and overlap cams, and high compression are good examples.
But many other techniques would do just the opposite. Precision balancing,
matching rod and piston lengths and weights, equalzing combustion chambers,
tuned exhaust systems and alike, will afford better performance and a much
smoother running engine. Not to mention friction reducing coatings mentioned
above. Dry sump oil systems and modifications to improve flow in the
lubrication system would be applicable too. Most of these items are too
expensive for a routine automotive overhaul, but begin to look much more
affordable for something as important and often as expensive aviation
overhaul.