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sundevil64 sundevil64 is offline
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Join Date: Apr 2009
Location: Cedar Park,TX
Posts: 2,617
Garage
Okay I have an update with an answer.

After checking all the lines and replacing the scavenge pump with another known good one I still had the same problem.

I ran a few more tests and found the threshold of the overflow at the vent to be about 1500 rpm.

I texted the PO and asked "Are there cam oil restrictors on the motor?" I wasn't aware at the time of the "groove" that is in them to identify them installed. He texted me back "Yes...". That would . explain the increased oil flow at temperature as the oil viscosity changes the flow increases to a point where the scavenge pump cannot keep up Now if I had the Clewitt scavenge pump it wouldn't be a problem as that one has a higher volume across the board, but I don't.

They were put in because the motor has spun a rod bearing, understandable. I think I will drill out the restrictors from 2.5mm to 4mm which is 1mm smaller than the stock which should give a little more oil to the rod bearings and not be a problem with the scavenge pump.
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Old 11-03-2011, 03:50 PM
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