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Oil film strength is strongest when keep to a mere film, so on race engines the tolerances are very close due to high HP and elasticity within the moving parts... we're seeing tight tolerance engines more and more today in the production car market as the average engineÆs HP increases and so race technology is carried over to the production car market.


A friend of mine works for a large race engine builder in L.A. Last time I saw him, he commented about the heat gun I was using to strip paint, laughed and said that the guys at work use the same kind to pre-heat the motors before start-up on the dyno because they run ZERO clearance on the main bearings. He said after the parts heat up that there's enough room for lubrication.


Really blew my mind <img src="/forums/images/graemlins/zombie.gif" alt="" />