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Performance / Re: Connecting rod bearing clearance
« Last post by ehjorten on Today at 10:25:54 AM »This doesn't make sense to me. You want to increase the bearing clearance to move to a lower viscosity oil? The relationship between oil viscosity and bearing clearance is directly proportional (i.e. tighter bearing clearances require lower viscosity, thinner oil and larger bearing clearance require increased viscosity, thicker oil).
0.0015" - 0.0025" is within a factory spec. Your 0.002" should be about perfect, but to really know you need a micrometer that can read down to the 0.0001". You don't know how tight the out of round is, or if you have slightly tapered journals. Given that you are spending a bunch of money to build your 383, you could take the crank to your machinist and have the journals polished up to take a few tenths off. That might be the best way to gain a little extra clearance.
0.0015" - 0.0025" is within a factory spec. Your 0.002" should be about perfect, but to really know you need a micrometer that can read down to the 0.0001". You don't know how tight the out of round is, or if you have slightly tapered journals. Given that you are spending a bunch of money to build your 383, you could take the crank to your machinist and have the journals polished up to take a few tenths off. That might be the best way to gain a little extra clearance.