Which stule of iil pump do you prefer and why
Oil Pumps - a multitude of styles
- Thread starter 65 Dartman
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Mattax
Just the facts, ma'am
With standard bearing clearances and engine temperatures the standard pump will work fine for most application. High volume pumps have taller rotors and will often interfere with the standard passenger car oil pans. Running looser bearings may call for higher volume and pressure.
This illustration came out of an article I *think* from SportsCar but could have been North American Pylon. If I find it I'll provide the proper credit. Take it for what it is - a way to think about how the changes can effect volume. I would not take it literally. A lot will depend on the temperature (becaues it effects viscosity) and the relief spring's pressure.
When the oil is cold a high volume pump is not going to provide any more volume at high rpm than a standard pump. The oil is just going to be too thick.
This illustration came out of an article I *think* from SportsCar but could have been North American Pylon. If I find it I'll provide the proper credit. Take it for what it is - a way to think about how the changes can effect volume. I would not take it literally. A lot will depend on the temperature (becaues it effects viscosity) and the relief spring's pressure.
When the oil is cold a high volume pump is not going to provide any more volume at high rpm than a standard pump. The oil is just going to be too thick.
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MOPAROFFICIAL
If it has tits, it's a liabilititty.
Pretty much what Mattax said.
Once an engine is fully warmed up, a standard pump is not going to put out much more than maybe 65lbs.
Stock clearances and 6000 rpm=stock pump.
Add loose clearance to that and you should still be good at under 6500rpm
Add 7000 rpm to that and now you should run a high pressure spring.
Add full groove bearings to the above and now its time to fit a high volume pump with the high pressure spring.
Most people are fine with a std pump.
But ultimately the bearing clearance and rpm usage are the deciding factors.
Once an engine is fully warmed up, a standard pump is not going to put out much more than maybe 65lbs.
Stock clearances and 6000 rpm=stock pump.
Add loose clearance to that and you should still be good at under 6500rpm
Add 7000 rpm to that and now you should run a high pressure spring.
Add full groove bearings to the above and now its time to fit a high volume pump with the high pressure spring.
Most people are fine with a std pump.
But ultimately the bearing clearance and rpm usage are the deciding factors.
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MOPAROFFICIAL
If it has tits, it's a liabilititty.
No.
I always use a HVHP pump.
One reason is because I almost always use full groove main bearing.
Another issue is flow is as important as pressure is. So I can use a HV pump, a thinner oil and get more flow through the bearings.
And, I want no less than 30 pounds of hot idle oil pressure.
If you go much lower than that by the time the oil gets to the rockers (the last to get oil in the system) you’ll have near zero oil pressure at the shafts.
It’s not a Chevy.
If I’m using big solid lifter or ANY roller ca I get full time, full pressure oil to the rockers, so what I see on the gauge is what is at the rockers.
I think I have a couple of pictures of how I do it.
I clock the cam bearings so the home going from the cam to the head is blocked.
Then I plumb in oil from the oil feed to the pressure gauge port.
You now have full time oiling to the rockers. And it’s not taking oil from the mains to feed the rockers.
You do need to install a restrictor in the head under the rocker shaft or you will send too much oil to the rockers.
One reason is because I almost always use full groove main bearing.
Another issue is flow is as important as pressure is. So I can use a HV pump, a thinner oil and get more flow through the bearings.
And, I want no less than 30 pounds of hot idle oil pressure.
If you go much lower than that by the time the oil gets to the rockers (the last to get oil in the system) you’ll have near zero oil pressure at the shafts.
It’s not a Chevy.
If I’m using big solid lifter or ANY roller ca I get full time, full pressure oil to the rockers, so what I see on the gauge is what is at the rockers.
I think I have a couple of pictures of how I do it.
I clock the cam bearings so the home going from the cam to the head is blocked.
Then I plumb in oil from the oil feed to the pressure gauge port.
You now have full time oiling to the rockers. And it’s not taking oil from the mains to feed the rockers.
You do need to install a restrictor in the head under the rocker shaft or you will send too much oil to the rockers.
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I guess it depends on the application and WHAT it will be used for.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
There's an order and application to abide by. You can have tighter clearances and run full grooves and still be fine with a std pump.
If you youre turning left the entire time you'll need baffles and a tray or even a std pump will suck air and foam the system.
There's no one size fits all
If you youre turning left the entire time you'll need baffles and a tray or even a std pump will suck air and foam the system.
There's no one size fits all
MOPAROFFICIAL
If it has tits, it's a liabilititty.
Saying it twice in the same sentence is pretty thorough..lol
I always ran high pressure, high volume oil pumps. I run solid cams and want to design to be able to run 7,000 rpm. I remember 10 psi per 1,000 rpm was a "rule of thumb" so 70 psi was the number I shot for. Standard factory oil pumps used to have a 45 psi relief spring, so that was not going to work for me. High volume was a safety factor for me, the extra volume if the pump wore and lost volume over time. Ran all kinds of stock pans from Early A to 71 340 with never a problem, street driven cars.
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