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Jon H...Chev 350 oil pres
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Posted by txblu on February 25, 2005 at 06:21:58 from (209.151.116.198):
Jon, Your comments: "With only a few exceptions,Chevy not being one of them,10 psi per 1000 rpm is enough for a heavy duty truck or even a race engine. 10 at idle and 30 at 3000 is plenty. A high pressure or high volume pump on a chevy just causes faster distributor gear wear.
.............." Respectfully asking: Would you mind sharing with us the origin of your comment concerning 10/1000 and the reason why I should believe you? If you are a reliable source of information I will be very grateful. I have worried for years about low oil pressure, especially in the GM 350. I have a Ford and Dodge and the pressure locks right in in the 50ish psi range regardless of idle or 2500 rpm, regardless of hot or cold. !@#$%^&*()_ Chev is all over the place. Been told they use a high volume, low pressure pump and don't do as others do which is to have a high press, low volume pump and a press relief valve which is what the other 2 must use or they couldn't maintain a steady pressure under all those variables. Well I know the physical relationship pv=kt and I don't buy the Chevy logic; not yet anyway. Course I haven't done any research on engine lubrication system types to understand why there are the differences mentioned. Guess if I was all that curious I'd have done that. Maybe I will if still concerned after your reply. Have a Perkins diesel which looses pressure when at operational temp and at idle it goes to around 15 psig at about 800 rpm idle. Don't want to overhaul it as it runs good and the Perk has lots of parts to fool with, but would like to stop worrying about pressure drop off at idle. My other tractors hold at least 30 at idle. (Use the same type 15w-40 or 50 in all engines) Thanks, Mark
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