Can anyone post a reference for what the oil pressure should be at idle? On a cold start I'm seeing 60psi. When the engine warms up I'm seeing under 10. Assuming the gauge is not junk.
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That's about what I see. About 60 cold, and about 9 when warm. I'm considering putting thicker oil in to see if it brings up the numbers a bit, since IIRC the lower threshold is like 7PSI, and 9 is a little close for comfort. -
Bentleys says 60-80 psi max. 10 psi warm idle is a bit low. Das Beast, turbo stroker with all new rings, gaskets, bearings & oil pump puts out 60 psi cold idle, 30 psi warm idle, 60 psi warm 3K rpm. I'm running Mobile One 15W50 synthetic. What grade are you running?"And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5Comment
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5w50 due for an oil change. And who knows if it ever had a rebuild.Comment
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what about warm at 3k rpm or so? This is the last important piece of the puzzle to troubleshoot your issueOriginally posted by turbski View PostComment
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Ill fire it up and get a warm readingComment
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Good to go. I wouldn't worry too much about idle pressure. Unless it starts behaving atypically89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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I agree with Digger. We have gauges on the endurance cars, they read ~8-12 hot idle, and both cars peak out over 80, but we have the oil reliefs modified. The stock relief should be 68psi (max pressure).
Also, we run 10w60 RaceTech LiquiMoly. We saw an increase in hot idle pressures after switching from M1. We tried some conventional years ago (no oil cooler) and the hot idle pressure dropped sown to 4-5psi after a 40min practice session at the track on a hot summer Florida day.
Most inportantly, you need high pressure at higher engine speeds. General rule of thimb is 10psi for every 1000 rpm at a minimum (~5psi idle, 20psi at 2000). When we build fresh engines at the shop, we usually see closer to 40psi at 2000rpm.Comment
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Mine reads about 9psi hot idle, ~42psi hot at 3000 rpm, and about 55 cold start up at idle. Think I'll try some thicker oil next oil change.Comment
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Im due for an oil change but will probably stick with 5w50 for the time being. Based on the feedback from the guys above im going to let a sleeping dog lie and not worry to much about it. I will ask just for the hell of it...… whats everyones choice in oil???Comment
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i now use this, says race oil but is ok for normal road use. the oil companies go pretty full on with marketing and BS
its normally quite expensive but got some bottles for $32 5L on special which is almost 1/2 RRP
was using a 10W-50 in summer but now just stick with 10W-40 all year round as oil doesnt get hot enough89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Likewise, I find that the oil choice makes the biggest difference with idle pressure,
Mobil1 15-50 sitting a little under 20 when it comes off track.
The VR-1 idle pressure was higher- but it also generated significantly more oil temperature at speed.
I went back to the Mobil product.
tnow, sometimes I just mess with people. It's more entertaining that way. george gravesComment
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Originally posted by digger View Posti now use this, says race oil but is ok for normal road use. the oil companies go pretty full on with marketing and BS
its normally quite expensive but got some bottles for $32 5L on special which is almost 1/2 RRP
was using a 10W-50 in summer but now just stick with 10W-40 all year round as oil doesnt get hot enough
I would say that is some very expensive oil and having trouble sourcing it, on the other hand the liquimoly is easier to come by than I thought, even found it on amazon of all places. I might give it a try and see what the car thinks about it.Comment
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