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Canucks Fan
Join Date: Jan 2009
Location: Vancouver B.C. Canada
Posts: 2,045
Question Oil flow questions

It's getting a bit colder and I was wondering about warm up times and oil flow. Does any one know the volume of oil that flows through the engine at idle, 3000 rpm?
Is the oil flow to the front cooler, temp. regulated or does it flow through the cooler all the time?
It's an 87 930
Old 11-15-2009, 07:12 AM
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Registered User
Join Date: Mar 2000
Location: Auburn,In. U.S.A.
Posts: 2,449

There are 2 oil cooler systems on your car, an engine oil cooler and a front
fender aux oil cooler. There is also a thermostst mounted in the right rear
inner fender. Oil circulates through the engine oil cooler system untill a
temprature is reached that opens the thermostst in the rear fender and
then oil flows through the engine cooler, through the thermostat, through
the front aux cooler, to the oil tank, and back to the engine.

Simplified explanation but you'll get the idea.

Cole - 80 930 "The Old Sled"
Mods: TurboKraft Custom IC, 934 Headers, GSX 61, Zork, Port Work, SC Cams, Air Mod Fuel Dist Relocated, Water Meth Injection, BL WUR, MSD 6530, Greddy EBC, Synapse Bov, Short 2nd & 3rd with 8:37 R&P, Wevo Shifter, Coupling, and Mounts, MTX-L SSI-4, Big Brakes, Rebel Coilovers, Bilstein Sports.

Last edited by cole930; 11-15-2009 at 10:13 AM..
Old 11-15-2009, 10:09 AM
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Registered User
Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
There are 2 seperate oil circuts in a 911 motor, and a third small one for the turbo sump in a 930.

The main oil pump in the crankcase is actually 2 seperate pumps together, a scavange pump and the main oil pressure pump.

Starting with the scavange pump oil in the crankcase, all the oil in the crankcase is pumped out of the engine to the external oil thermostat next to the torsion bar cover in the right rear fender well.
This pump is not high pressure because it is not pumping oil through small oil clearances in shell bearings so there is not much restriction to flow but it moves alot of oil.

If the oil is cold or just warm it is diverted from the external thermostat back to the oil tank where it is pushed through the spin on oil filter and then it settles into the baffled oil tank.

If the oil is hot like up around 170 degrees, (I don't know the exact opening temperature) then the external thermostat diverts the oil forward to the external oil cooler in the right front wheel well. From there the oil flows back through the oil line to the external thermostat and on to the oil tank where it goes through the oil filter and then settles into the oil tank.
Thats the scavange oil circut.

The other half of the crankcase oil pump is the main pressure pump.
It sucks oil from the bottom of the oil tank through the large S shaped hose into the engine's oil pump.
From there the pressurized oil goes to an internal thermostat in the top of the engine case next to the oil pressure switch and crankcase breather.

If the oil is cold or just warm that thermostat diverts the oil around the engine mounted oil cooler and sends it to the oil galley where it branches off to the crankshaft main bearings and on to the rod bearings and at the end of the oil galley it branches off to the cam towers through external oil lines to lube and cool the cams, rocker arms, and valve guides.

If the oil is hot the internal thermostat in the engine diverts the oil through the engine mounted oil cooler and after that it goes to the oil galley, etc.

On a 930 there is one more small external oil pump on the end of the driver side camshaft that sucks oil from the turbo sump and pumps it directly to the oil tank unfiltered.

hope that helps...
Old 11-15-2009, 10:46 AM
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Tinkering Pays!!
mooney265's Avatar
Join Date: Sep 2008
Location: New Orleans
Posts: 1,365
This should help, too...

LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 11-15-2009, 05:43 PM
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one of the great unwashed
patkeefe's Avatar
Join Date: Apr 2004
Location: Ringwood, NJ
Posts: 2,850
I have tried to find the mystical oil flow volume/time numbers for two years, and can't. I sent emails to the factory, but they never answer anything. I wanted to do some calculations regarding resizing of the oil lines in various places, and flowrate is essential to that (along with the 10 or so other variables that are coincident). If I ever find it, I'll post the number.

The explanations and diagram posted above are as good as you will find.
Patrick E. Keefe
78 SC
01 Boxster
Old 11-21-2009, 02:58 PM
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