Oil Pump/Pressure Question. 20psi at idle
#1
Oil Pump/Pressure Question. 20psi at idle
I searched and didnt find much. But the oil pressure in my car at idle after its warmed up is right above 20psi, normal driving it sits around 40psi. Its up a little higher when its cold but after its warm it settles back down. Does anybody know what the problem might be? I was told maybe a gasket, o ring or something, does anybody have any ideas? Also, is it ok to drive? thanks
Last edited by 98NBM_TransAm; 02-20-2005 at 02:55 PM.
#6
So will this be ok? Camaro99SS, i honestly dont know if it has been replaced, i heard about that problem also, but its been like this for at least 15k (never paid much attention until i heard of the problem) if it was bad do you think it would take over 15k to go out? This may also be a dumb question, but im doing a cam swap soon, can i access the pump while i do that or will i have to remove alot more stuff, possibly pull the motor?
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Originally Posted by Chris@AP-Engineering
Stock motor or forged?? Has it always been this way? As long as you have 10psi for every 1000 rpm you are fine.
Paul
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Originally Posted by NastySSoo
Chris, why did you ask forged or stock? Which one typically has more pressure?
Paul
Paul
Stock engines usually have a lot more pressure than a forged engine. Unless the forged engine is using shims in the oil pump. The reason generally comes down to the stock engine having a lot tighter bearing clearances then the forged motors. Also a stock engine generally has a bearing that is shaped different from the high perf bearings. Back to the bearing clearances, stock engines can have any where from .0008" - .020" for bearing clearances, where a typical forged engine may have .002-.003" for clearance. Hope this has answered your question.
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The oil pump has a bypass for excess oil....but I can't remember what psi the stocker is set at. When you shim the pump, all you're doing is setting the bypass pressure up.
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Originally Posted by 98NBM_TransAm
So will this be ok? Camaro99SS, i honestly dont know if it has been replaced, i heard about that problem also, but its been like this for at least 15k (never paid much attention until i heard of the problem) if it was bad do you think it would take over 15k to go out? This may also be a dumb question, but im doing a cam swap soon, can i access the pump while i do that or will i have to remove alot more stuff, possibly pull the motor?
I'd say it'll tack on another hour or 2 in the cam swap if your doing it yourself. Just have to be sure not to pinch the o-ring
Craig
#13
Originally Posted by Fade2blk500
If your going to do a cam swap, I'd definitely say go ahead and do the oil pump.
I'd say it'll tack on another hour or 2 in the cam swap if your doing it yourself. Just have to be sure not to pinch the o-ring
Craig
I'd say it'll tack on another hour or 2 in the cam swap if your doing it yourself. Just have to be sure not to pinch the o-ring
Craig
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We've got a Vette here doing the EXACT same thing. 20-25 psi at hot idle, jumps to 40 psi or better during cruise, but never quite hits 60 psi at WOT. Like 55 or so. I have made numerous inquiries and the consensus is the its ok. BTW, its a forged 370 ci iron block, very agressive h/c combo, 11.16:1 cr.
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Mine did the same thing.. hovered around 20-25 psi at idle, warm... esp if it was really warm out [80* plus] and 45 ish during cruise and 50-55ish at WOT.. all warm
Cold, it jumped to around 70 psi ..
Ever since I got the mods listed in the sig.. it now stays at 40 psi idle warm and 55ish cruise and 60-65 at WOT
I bought the car with 91K miles and now has 104K on it...
Just keep an eye out at the gauge, and do the pump when you do a cam... I think you will be okay till then..
Cold, it jumped to around 70 psi ..
Ever since I got the mods listed in the sig.. it now stays at 40 psi idle warm and 55ish cruise and 60-65 at WOT
I bought the car with 91K miles and now has 104K on it...
Just keep an eye out at the gauge, and do the pump when you do a cam... I think you will be okay till then..