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sundevil64 sundevil64 is offline
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Join Date: Apr 2009
Location: Cedar Park,TX
Posts: 2,617
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.
John- I blame and thank the longhood boys of Austin
-84 911 Carrera w/ 930 t/p,efi'd,dizzy free,HFS turbo, 78 930 RoW no option sunroof coupe, 64 Corvette roadster, 71 911T, 73 911E, 67 Bronco survivor. 71 FJ40, 95 M3 (for sale)
"Illegitimi non carborundum"
Old 11-03-2011, 03:50 PM
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