[QUOTE=type25]
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Originally Posted by trainwrex
Ok, in brief...
we should agree that race built engines are highly stressed (under race conditions).
because of this they are generally built looser, (with larger clearances), so that they spin easier and have less chance of nipping up.
... because of these looser clearances and the greater stresses that are under they will generally wear out quicker/ need refreshing on a regular basis.
This is commonly done with race engines to prevent catastrophic failure, (and a whole heap of scrap metal).
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Agree agree to that point. Most engines are generally built looser, but mine however is built fairly tightly only 2.5 thou clearances.
Refreshing is a common occurance when driven hard, but i can not see the need when driving the car normally that a refresh is needed.