Posted by David G on April 22, 2020 at 18:27:27 from (209.181.208.169):
My 44 EFI has a 3 main bearing crank, extremely long stroke and small valves. OK, I have just explained why I should not have put a bunch of money in it, but my dad and I spent tons of time together on it when I was young. It was also the first vehicle I drove.
So, lets talk main bearings.
I really lugged it down on the dyno when I tuned the EFI, enough it scared me about the main bearings holding up.
I have upgraded the oil pressure relief so it runs 40 at idle and 50 at RPM. I should have plenty of oil regardless of 3 or 5 main bearings.
I am running it about 150 RPM greater, or 1500, but it does have lighter forged pistons. I would assume that there is stress on the crank do to the higher RPM's.
Is there any data on how much torque to put through a 3 main bearing crank?
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