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Re: [GMCnet] High volume oil pumps [message #246348 is a reply to message #246119] Fri, 04 April 2014 02:25 Go to previous messageGo to previous message
BobDunahugh is currently offline  BobDunahugh   United States
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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The main, and rod bearings will pass the same amount of oil at 700 RPM as at 3000 RPM. As the bearing clearance remain constant as long as the oil pressure remains the same. The output of the oil pump goes up as the RPM's increases. At idle. The relief valve is generally closed. ( Except at start up with a cold engine. ) This can be observed on the oil pressure gauge. You can also observe when the relief valve opens as the RPMs increase.. The oil pressure gauge will also increase. There will be a point that the gauge will stop climbing. Even though the RPMs continue to increase. That is the point that the relief valve starts to send the excess oil back to the pan. With the OEM pump in place. And if you pay attention to what your dash gauge is doing. You can get indications of the condition of your bearings, and pump. If you have a high volume pump. The relief valve is bypassing oil most of the time.This will decrease the movement of the dash guage. Some guys get upset bec
ause of the gauge moves to much. When it moves. It's telling you a store on the health of your engine. A static gauge due to a high volume pump is saying nothing . And can mask issues that are building up internally. Personally. I like it that my dash gauge is communicating to me. As ror the splash oiling systems. Yes. Way back in time. A splash system worked in car, and truck engines. But that wasn't the kind of splash that we have been discussing. There was more to that system then oil just flying around the crank case. And that oiling system worked well until compression ratios got above 5.2 to 1. As for the Briggs. Low compression with very little weight in the reciprocating mass. That's what made that work. Anyway. That's my input.Bob Dunahugh
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