HD Oil Pump vs. OEM Oil Pump

[Mesa Mike]

I have my oil pump out and wonder if I should replace it with a HD pump or go back with OEM oil pump. I had the OEM pump in and another builder recommend the heavy duty in stead of the OEM. Old pump has about 10,000 miles on it. Which would you guys recommend?

[frankeeski]

Stock volume and pressure Mike.

[michael everson]

10,000 miles? Put it back in.
Mike

[Mesa Mike]

Thanks Mike. Stock pump back in. I was loosing oil pressure so I thought it might be the pump. Turns out the bearings were bad.

[riptide motorsport]

If you go with the high volume pump without any mods to the oiling system you risk oil starvation as the pump will pump too much oil from t he pan too quickly.

[Bob Cowan]

Once again, it all depends on use and application.

Why are the bearings bead? You mentioned before that you needed to have the crank turned. Sounds like something blew up, and contaminated the oiling system (been there, done that!).

If that's the case, open up the pump and see what it looks like. If there are some small nicks here and there that can be polished out, no sense in replacing it.

[Dan Babb]

High volume pumps have been known to cause failures in Ford 5.0s. I don't remember why, but remember reading a lot of posts about not using a HV pump for that reason.

Standard pump is all you need.

[tirod]

The high performance pumps have a place - in a block that has all the oil galleries worked over to handle the flow. Otherwise, HV or HP, the bypass opens up because the system is overloaded.

The purpose of a HV pump is to make more oil flow because the clearances on the bearings have been set a lot more open for racing purposes. HP pumps are simply shimmed up for more pressure - on a stock block with standard clearances, all you wind up doing is churning the oil more and consuming a hp or two, to boot. And both will pump more oil into the valve covers, which lowers the crankcase volume and helps uncover the pickup more quickly in cornering.

A blueprinted pump is what gets used more often in race blocks. It's taken apart, miked, the clearances checked, the parts checked/corrected for flatness, safety wired, and boxed back up. Mostly labor, and you get a pump well looked over. If anything, Ford pumps need better drives connecting them to the distributor, and a good filter that won't blow open internally and dump the pressure before it even gets a chance to get to the block. Filters let go a lot more often than pumps. But, race teams use screens to catch the internal debris - they don't plan on 7,500 mile oil changes. No filter with it's own bypass valve to fail is one less thing to go bad. They aren't worried much about subfreezing temps and cold starts.

Pumps are just another one of those "race car" things that don't really help unless it's part of a system designed for a particular advantage - which always has an offsetting disadvantage.

[Mesa Mike]

Thanks for the reply's.

Here is what I learned at the machine shop. A high volume oil pump can ONLY be used in applications where you have ample space for the additional oil flow to go. One way is to narrow the rods to allow some "splash" space. Other wise, as stated by tirod, if not modified the HV pump will overload the system. I have heard, in the past, that a HV pump is not required. Now I know, without modification, it can cause problems. NO HV OIL PUMP IN STOCK 5.0.