Melling HV oil pump

46ford

46ford

Senior Member
I was thinking of getting one of these. The note in the Speedway catalog says the pump will require modification to the oil pan, however I don't recall the stock pump being that close to the bottom of the pan. Has anyone done this?
 
The oil pump is not higher pressure but high volume. If your bearings are loose you should see some pressure increase, if a new engine was assembled with the proper bearing clearances you would see very little increase in pressure from a stock pump verses a high volume. A high pressure pump can erode bearing material if the pressure is set to high. A HV pump is a good idea.
 
Pressure is caused by a resistance to flow. If you have a high volume pump, you will have higher pressures.
 
I have always been told that it's best to use an M-19 OP for engines built with normal/factory specified bearing clearances and an M-15 high volume OP for racing engines built with greater bearing clearances. I have never had a problem with oil pan clearance when using an M-19 OP.
 
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am running an M15 on my 8BA. origionally installed it in hopes of fixing low oil pressure due to excess ware. didn't help much, so i re-did the bottom end and the cam bearings. am still using the M15. runs 48 psi at cruise with 15-40. did have to rework the pan a bit with a hammer. as i recall it was the longer body of the pump that interfered with the pan
 
Higher pressure just heats up the oil which is counter productive to one thing it is supposed to do which is dissipate heat. I run 30-35 psi on the highway. 5psi at idle. Stock pump stock clearances.
 
I installed my high pressure pump on a French block with Red's Headers 100% filter system. I only used it because the pump is pushing ALL the oil through the filter medium. That was my theory, engine running file, 10 years and many miles.
 
Here we go again!!!!
 

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I have a McCullough Super Charger and plan to install it after Cool Deadwood Nights. It looks like you add a fitting to the oil pressure sending unit.

What do you think about a high volume oil pump for this application?
 
The pan modification questioned would be the removal of the baffle in the pan (we're assuming you are talking about a '46 Ford). The late model pickup fits farther forward than the stock pickup.

I also had to heat and bend the tube of the pickup as it dropped a little too low for my pan. It probably would have fit as-was, but it would have touched the pan. I bent it for 1/8" clearance. Your mileage may vary.
 
Hi All; Just a note, remember the '48 & earlier have that relief valve in the lifter gallery to deal with when the later pump is installed. Newc
 
Newc said:
Hi All; Just a note, remember the '48 & earlier have that relief valve in the lifter gallery to deal with when the later pump is installed. Newc
Click to expand...

What would you do with the relief valve? Raise the setting, lower the setting or leave it alone are the only options. What is recommended?
 
Dad built a lot of racing motors back in the day and he would never use a H/V pump.
He said with the sustained high RPM, the H/V would pump the oil pan low which would kill the lower motor. I’ll never use a H/V oil pump !!
 
TobbyT said:
Dad built a lot of racing motors back in the day and he would never use a H/V pump.
He said with the sustained high RPM, the H/V would pump the oil pan low which would kill the lower motor. I’ll never use a H/V oil pump !!
Click to expand...

That's the most absurd statement I've heard in a long time.
 
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