High volume or high pressure oil pump

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Dan the man

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Which would be better for a mild build 318? Would the use of a windage tray be a good idea? Thanks everyone
 
Stock oil pump, regular volume. If you want to increase oiling efficiency, look a oiling mods on the small block forum. A windage tray always helps, it may not increase horsepower on a low rpm engine but it may keep your sump in oil.
 
ch1ll said:
Stock oil pump, regular volume. If you want to increase oiling efficiency, look a oiling mods on the small block forum. A windage tray always helps, it may not increase horsepower on a low rpm engine but it may keep your sump in oil.
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Thanks
 
It depends on how high you want to turn your 318. The general rule of thumb is for every 1,000 rpm you need 10 psi of pressure. The 340 used a relief pressure of about 65 psi. I always run HV pumps for insurance.
 
66fs said:
It depends on how high you want to turn your 318. The general rule of thumb is for every 1,000 rpm you need 10 psi of pressure. The 340 used a relief pressure of about 65 psi. I always run HV pumps for insurance.
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Most likely the rpm's will be in the range of the cam, 800-5200 rpm's
 
For a street car I use a standard melling pump and add a wind age tray. I always try to look through the catalog and look for a pickup tube with a bigger screen on the end if possible.
Check for burrs and check tolerances in the new pump. Manufacturing quality control is at an all time low in most industries right now.
 
HankRearden said:
For a street car I use a standard melling pump and add a wind age tray. I always try to look through the catalog and look for a pickup tube with a bigger screen on the end if possible.
Check for burrs and check tolerances in the new pump. Manufacturing quality control is at an all time low in most industries right now.
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I thought about checking out the tolerances, I agree with you about the poor quality control.
 
A common issue with new pumps can be debris in the pressure relief valve, causing it to stick. Always take a new pump apart and clean it.
I have always used high volume pumps in my 340's.
 
I follow the smoky yunick theory of oil pumps. High volume, high pressure pumps use more horsepower. Now couple that with the dinky small oil lines throughout the engine block and all the sharp and mismatched mating surfaces of the oiling system more hp used up for little more flow and pressure. Better to improve the oiling circuit before installing hp oil pumps.
 
318willrun said:
Just use the original oil pump. It will
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ch1ll said:
I follow the smoky yunick theory of oil pumps. High volume, high pressure pumps use more horsepower. Now couple that with the dinky small oil lines throughout the engine block and all the sharp and mismatched mating surfaces of the oiling system more hp used up for little more flow and pressure. Better to improve the oiling circuit before installing hp oil pumps.
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Is there a article in the engine section that talks about oil system modifications? I have a old mopar engine builder's manual that covers from the slant 6 to the hemi, it's over 600 pages I think.
 
Dan the man said:
Is there a article in the engine section that talks about oil system modifications? I have a old mopar engine builder's manual that covers from the slant 6 to the hemi, it's over 600 pages I think.
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There are several threads here on the topic, but for a mild engine I'd spend your efforts someplace else.
 
I don’t know how to paste a link from my iPhone , but you can find this thread here.

Home>forums>mopar technical forums >small block mopar engines.

Titled: any one interested in the oiling mods I did ?
Thread author: guitar jones.
 
ch1ll said:
I follow the smoky yunick theory of oil pumps. High volume, high pressure pumps use more horsepower. Now couple that with the dinky small oil lines throughout the engine block and all the sharp and mismatched mating surfaces of the oiling system more hp used up for little more flow and pressure. Better to improve the oiling circuit before installing hp oil pumps.
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No, they don’t. How big is your drill motor to build 80 psi? It ain’t much.
 
If you are using full groove mains, and you SHOULD be then you use a HV, HP pump. It won’t suck the pan dry, it doesn’t take more power to run.
 
Rat Bastid said:
If you are using full groove mains, and you SHOULD be then you use a HV, HP pump. It won’t suck the pan dry, it doesn’t take more power to run.
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I was thinking about using full groove main bearings, but the engine most likely won't be spun over 5k, 5500 tops.
 
You aren't building a race motor. Use a stock pump and even with no modifications, it will be fine. Hundreds of thousands of small blocks have survived with stock parts and no modifications.
 
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we run std oil pumps in our 340 stockers, fullgroove mains, 7500 rpm in traps, oil pressure is 72 #, 10-30 oil idle press is 63 #. bearings always look very good after 300 runs or more.
 
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