Quote:
Originally Posted by Aurel
If you had a crankshaft that was slightly below the wear limit on the mains, rather than regrinding it one size under, would it make sense to just polish it, buy a set of standard bearings and send them to calico for coating a dry lubricating film inside the bearings with enough thickness to bring the tolerances back into specs? I am pretty sure they can coat any thickness we ask, not sure what the maximum is. Just a thought...then if you had spun a rod bearing, do the same on a new rod bearing...I wonder if this has been tried before.
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Coatings may work for awhile but it would be a hit or miss remedy.
How much under are we talking about?
If the number is minor you'll probably fine. Eight main bearings on a six cylinder engine gives you a pretty stable platform for main bearing stability. Remember to use cam flow reducers and updated pressure relief springs and caps to maintain oil higher oil pressures. There is a train of thought that says high larger clearances with high oil pressures is how you generate horse power. BMW and Chevy race engines seem to employ this theory.
If you have a 9 bolt crank, you could buy a set of GT3 main bearings in the smallest size (I think red). They come in tree different sizes for custom fitting of race cranks.