Oil pressures with "blocked off" DOD engine?
Thread Starter
Joined: May 2011
Posts: 8,487
Likes: 1,033
From: Wichita, KS
I'm curious what you mean by "vane type". The last I looked, all of the pumps were a georotor design, just different sizes for different volumes.
The afm AND vvt combo truck engines use a vane type oil pump. If it just has vvt it has a reg pump and most times if it just has afm it has reg georotor pump.
What I said clearly states I would go from the vane style to the georotor like the reg melling and the stock ls6 pump as melling does also make an afm/vvt pump also. I dont know if it is a vane style but I do know the other vvt/afm combo pumps are.
What I said clearly states I would go from the vane style to the georotor like the reg melling and the stock ls6 pump as melling does also make an afm/vvt pump also. I dont know if it is a vane style but I do know the other vvt/afm combo pumps are.
The hole between the bolts denotes the pump pictured is high volume GM. These are used on DOD engines and also with piston oil cooling. All pumps are same style/design, but the gears are .100 wider in the high volume pumps used in DOD engines. The hp required is very low, but if you want it reduced get the high volume pump out. The pump is always pumping all it can, just more hitting by-pass in high volume design. I would guess if Nascar guys lower the pressure for qualifier it would be with very thin oils at very high temps, that would help windage. They also race with the valve covers filled with oil for dampening valve motion, they might Q with less oil trying for reduced drag. Not much of that will connect with normal driving cars
Kurt
Kurt
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Thread Starter
Joined: May 2011
Posts: 8,487
Likes: 1,033
From: Wichita, KS
I won't pretend to be a nascar guy. I was just quoting from the article from Engine Builder Mag that clearly states...
"Most NASCAR engines run half the normal oil pressure to reduce parasitic horsepower losses created by the oil pump."
Also said they used a 0w-20 synthetic oil.
http://www.enginebuildermag.com/2012...e-oil-systems/
I know Kurt's "been there done that" with all these LS setups and I'd take his advice over most. But it takes power to make additional pressure. If that additional pressure isn't' needed, why not bypass it?
A good direct comparison on oil pressure VS power gain.
http://www.shoptalkforums.com/viewtopic.php?t=101582
"Most NASCAR engines run half the normal oil pressure to reduce parasitic horsepower losses created by the oil pump."
Also said they used a 0w-20 synthetic oil.
http://www.enginebuildermag.com/2012...e-oil-systems/
I know Kurt's "been there done that" with all these LS setups and I'd take his advice over most. But it takes power to make additional pressure. If that additional pressure isn't' needed, why not bypass it?
A good direct comparison on oil pressure VS power gain.
http://www.shoptalkforums.com/viewtopic.php?t=101582
The difference is like a boosted car needing 10 pounds of boost:
The Nascar guys are running a D1SC maxed out at 10PSI.
The high volume guy is using F3136 and bleeding off excess pressure to maintain 10PSI.
Which one will save HP?
It saves power when you just use enough pump like the Nascar guys or car companies will do. The only reason GM would run the high volume pump is when another function inside the engine requires it, that need forces the added volume. I typically run higher pressure than some others, but I do it with standard pumps and a close eye on clearance. That way my parasitic drag is not increased by the pump volume, just the minor output pressure change. I do sometimes use the high volume pumps, but normally in lower rpm engines.
Kurt
The Nascar guys are running a D1SC maxed out at 10PSI.
The high volume guy is using F3136 and bleeding off excess pressure to maintain 10PSI.
Which one will save HP?
It saves power when you just use enough pump like the Nascar guys or car companies will do. The only reason GM would run the high volume pump is when another function inside the engine requires it, that need forces the added volume. I typically run higher pressure than some others, but I do it with standard pumps and a close eye on clearance. That way my parasitic drag is not increased by the pump volume, just the minor output pressure change. I do sometimes use the high volume pumps, but normally in lower rpm engines.
Kurt
I won't pretend to be a nascar guy. I was just quoting from the article from Engine Builder Mag that clearly states...
"Most NASCAR engines run half the normal oil pressure to reduce parasitic horsepower losses created by the oil pump."
Also said they used a 0w-20 synthetic oil.
http://www.enginebuildermag.com/2012...e-oil-systems/
I know Kurt's "been there done that" with all these LS setups and I'd take his advice over most. But it takes power to make additional pressure. If that additional pressure isn't' needed, why not bypass it?
A good direct comparison on oil pressure VS power gain.
http://www.shoptalkforums.com/viewtopic.php?t=101582
"Most NASCAR engines run half the normal oil pressure to reduce parasitic horsepower losses created by the oil pump."
Also said they used a 0w-20 synthetic oil.
http://www.enginebuildermag.com/2012...e-oil-systems/
I know Kurt's "been there done that" with all these LS setups and I'd take his advice over most. But it takes power to make additional pressure. If that additional pressure isn't' needed, why not bypass it?
A good direct comparison on oil pressure VS power gain.
http://www.shoptalkforums.com/viewtopic.php?t=101582
Imagine taking a gallon bucket of paint and tossing it onto a wall the splash/fan pattern it makes. Now use a 5 gallon bucket and do the same thing. All that volume has to go somewhere and if the clearances are tight it all comes out the end instead of the clearances absorbing the extra volume or another oil fed component.