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What technically is the oil pressure gauge reading on the dash?
Is this total pressure for the entire crankcase only ?, How about peripherals such as cam towers, things like oil filter, breather hose, lubrication into the timing chains, etc.,?
Thanks anyone.
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1969 911 E Coupe "Little Bull" "Horse" "H." Heart, "G." Gears, and "P" the Porsche |
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10-17-2005, 11:19 AM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,272
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HGP, sorry, can't answer your question, but aren't you the guy that with little to no exp pretty much rebuilt your engine because the heads were messed up?? Glad to see it's still running (I assume) and you are still workin' on it.
Good luck!
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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10-17-2005, 11:27 AM
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durn for'ner
Join Date: Feb 2005
Location: South of Sweden
Posts: 17,090
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I think the oil pressure is measured with the oil pressure sensor gauge located on right top of engine and as a general guide should rise approx. 10 psi for every 1k rpm.
But maybe that didnīt answer your question.. ?
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Markus Resident Fluffer Carrera '85 |
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10-17-2005, 11:29 AM
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Location: St. Louis region
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It can only measure the psi at the point where the measurement is taken. The oil pressure is not going to be the same everywhere inside the engine. Why do you ask?
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Deceased: Black '88 Carrera Coupe, Steve Wong and Russell Berry chips, Dansk premuffler, custom MK GT3-style muffler, Magnecores. Al Reed 7 & 8 X 16 Fuchs. Full Elephant Racing suspension, 21/28 T-bars, Turbo tierods, bump steer kit, Bilstein Sports, BK strut bar. Ruf bumpers, 935 mirrors, Carrera 3.0 tail, DasSport bar. '11 BMW 328iX, '18 Nissan Frontier 4X4, '92 Acura NSX. |
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10-17-2005, 11:45 AM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
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The pressure is case pressure (internal passages, not the pressure in the air space that the crank spins in). There is some loss between the pump and the gauge, especially at higher flowrates, but it's marginal. You can assume that the gauge reading is what your bearings are seeing, with the exception of a blocked or abnormal restriction in any of the oil passages. The pressure at the cam spray bars is marginally less, but again, you can assume your gauge pressure is what is at the spray bars.
The filter pressure is much less as the oil is pumped by the scavenger pump, then goes to the cooler and back to the tank. The hoses are under case (not oil passage) pressure. Last edited by MotoSook; 10-17-2005 at 12:01 PM.. |
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10-17-2005, 11:59 AM
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durn for'ner
Join Date: Feb 2005
Location: South of Sweden
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Souk..... wow !
You guys just keep blowing me away with your knowledge.
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Markus Resident Fluffer Carrera '85 |
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10-17-2005, 12:09 PM
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Quote:
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1969 911 E Coupe "Little Bull" "Horse" "H." Heart, "G." Gears, and "P" the Porsche |
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10-18-2005, 10:22 AM
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Registered
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Quote:
 
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1969 911 E Coupe "Little Bull" "Horse" "H." Heart, "G." Gears, and "P" the Porsche |
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10-18-2005, 10:27 AM
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