Thread: Insert bearings
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Old 07-04-2020, 08:43 PM   #57
Dave in MN
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Join Date: May 2010
Location: Jordan, MN
Posts: 1,410
Default Re: Insert bearings

Synchro,
I made a series of tests on an engine I was building for myself on my dyno some years back related to the required oil clearance for the insert bearings I use. I found I needed to increase the oil clearance for the rear main to between .002" to .0022". Any tighter and I could experience a failure (lock up) when the engine was heavily loaded. The manufacturer suggests .00175" and that will work for the front and center bearings, I prefer a bit more between .00175 to .002".
I tried increasing the oil groove at the parting line of the inserts approaching .25" from the rear of the bearing but it also failed. The only thing that worked was more oil clearance.
Hope you solve your issue.
Good Day!

Last edited by Dave in MN; 07-07-2020 at 06:02 AM.
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