OIL PUMP
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From: Rockville, Ct.
OIL PUMP
Okay guys. Since I'm going the toothless Jake route in my engine rehab I looked up a new oil pump. Rock Auto offers a standard volume / standard pressure, Standard volume / high pressure, and a high volume version.
What should I go with?
Wouldn't high volume create higher pressure as well?
So what's the gain with standard volume / high pressure?
Also, it said to make sure of crank and pan clearance for the high volume model?
If I had to make the decision w/o any other input I would go with the standard volume/pressure one.
I'm all ears guys. Thanks, Todd.
What should I go with?
Wouldn't high volume create higher pressure as well?
So what's the gain with standard volume / high pressure?
Also, it said to make sure of crank and pan clearance for the high volume model?
If I had to make the decision w/o any other input I would go with the standard volume/pressure one.
I'm all ears guys. Thanks, Todd.
Fleet Owner
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From: NorCal
Lead Driver
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From: On the Edge of the Desert
Originally Posted by CougarJohn
What? Are you advising that he overfill the crankcase?
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From: El Dorado, Arkansas
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From: Cupertino
351, a low-volume oil pump and a high-volume oil pump have a preset pressure in the relief spring. Once you reach that pressure, the oil is dumped back into the crankcase.
A high-volume pump will increase pressure at idle, all things equal, and get you up quicker to the relief pressure. After that, you are increasing the entropy of the universe, blowing oil back into the crankcase at a higher temperature than it would otherwise be.
Parasitic loss.
A high-volume pump will increase pressure at idle, all things equal, and get you up quicker to the relief pressure. After that, you are increasing the entropy of the universe, blowing oil back into the crankcase at a higher temperature than it would otherwise be.
Parasitic loss.
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Lead Driver
Joined: Jul 2011
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From: On the Edge of the Desert
Originally Posted by CougarJohn
351, a low-volume oil pump and a high-volume oil pump have a preset pressure in the relief spring. Once you reach that pressure, the oil is dumped back into the crankcase.
A high-volume pump will increase pressure at idle, all things equal, and get you up quicker to the relief pressure. After that, you are increasing the entropy of the universe, blowing oil back into the crankcase at a higher temperature than it would otherwise be.
Parasitic loss.
A high-volume pump will increase pressure at idle, all things equal, and get you up quicker to the relief pressure. After that, you are increasing the entropy of the universe, blowing oil back into the crankcase at a higher temperature than it would otherwise be.
Parasitic loss.
Most of the time, the oil level isn't an issue. But it can be when going around a corner, or hard acceleration, when it will slosh away from the pickup tube. An extra quart helps prevent that from happening. Not to mention the other benefits of more oil. Like extra cooling ability, possible extended oil change intervals, and so on.
On the pressure side of it, yes a high volume pump will run the pressure up more quickly and hold it higher, because it is pumping more oil. But since when is oil pressure a bad thing? I get concerned when my oil pressure drops below 25psi....
Fleet Owner
Joined: Dec 2009
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From: NorCal
Consider installing restrictors under the rocker stands prioritze oiling the main bearings.
If ever the engine is apart, radius and smooth the oil drain back holes... could also install screens to catch crumbled umbrella seals.
When I used to autocross, my GTI's oil pressure warning light would sometimes illuminate due to the G-load. A windage tray took care of the issue.
If ever the engine is apart, radius and smooth the oil drain back holes... could also install screens to catch crumbled umbrella seals.
When I used to autocross, my GTI's oil pressure warning light would sometimes illuminate due to the G-load. A windage tray took care of the issue.
Lead Driver
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From: On the Edge of the Desert
Originally Posted by HIO Silver
When I used to autocross, my GTI's oil pressure warning light would sometimes illuminate due to the G-load. A windage tray took care of the issue.
Fleet Owner
Joined: Dec 2009
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From: NorCal
The rocker shaft supports are recommended when running a high lift cam and stiffer valve springs. I don't think too many of us have cams of more than .550 lift. Some day......
Laughing Gas
Joined: Mar 2013
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From: Garner NC
I went with high volume as the rpm my motor will see is in the low range. Also, I am using stock sized bearings. No machine work to block, rods or crank. They all mic'ed fine, but did lean to the loose side. I also put the restrictors (Holley jets drilled to 90) in the heads. Still kicking around an external electric oil pump so it never starts dry. Low duty cycle for this vehicle. It's going to sit around most of the time.
And I had to chuckle picturing my dump truck in 'hard acceleration.' Yeah, accelerating will still be hard...
And I had to chuckle picturing my dump truck in 'hard acceleration.' Yeah, accelerating will still be hard...
Hotshot
Joined: Oct 2002
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From: The Big, Oregon
If you have new bearings or more than about 5-8psi of idle oil pressure, a high volume pump can cause more headaches than anything. I once had a 78 F150 with a built 400, and the previous owner put in a high volume pump as part of a rebuild. The truck stripped the teeth off the cam gear more than once before we sorted out that is was the oil pump's fault. Once the pump was changed it stopped doing that.
If you have the pan off, do the right fix and throw in new bearings along with a regular pump.
If you have the pan off, do the right fix and throw in new bearings along with a regular pump.