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Originally Posted by BAN SUVS
I dunno... I'm of the opinion that autocross is harder on the drivetrain than road racing is.
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Absolutely not. Extended high RPM operation seen in actual road racing (or circle track) wears out engines very quickly, wearing bearings, fatiguing the rotating assembly, valve springs, valve seats, etc. etc. In any real track car that can develop appreciable lateral grip, oil starvation during sustained cornering forces and heat load on the components also become real issues. This is why you see adaptations like dry sump systems, oil squirters to cool the valve springs, etc. - so that racing engines will survive longer.