Calculating oil pump requirements

[buzzinhalfdozen]

Originally Posted by D. Hake 4459

Years ago I modified some Melling m55 oil pumps for small block chevy stock eliminator engines. I cut the gears down and cnc machined a plate to go in the bottom to take up the space I also did some other modifications. I did some 1/4 " and some 3/8" pumps. The 3/8" pumps were worth 9 horsepower more than a m55 in back to back dyno tests.I was planning to tap into the bypass circuit and plumb in a flow meter to monitor bypass flow. About that time Schumann started making pumps and I was raising my son so I didn't have time to pursue it. If you can monitor bypass flow you could find out how much oil pump you need. Derek

I like the idea, since I've got 2 of these pumps I've wondered about cutting down the gears and putting a plate in the void. I believe it's a inch and a half pump section, which is how I believe they rate them (by body size) may be worth looking into. Maybe make it 1 inch?

[Ed Wright]

Originally Posted by buzzinhalfdozen

I like the idea, since I've got 2 of these pumps I've wondered about cutting down the gears and putting a plate in the void. I believe it's a inch and a half pump section, which is how I believe they rate them (by body size) may be worth looking into. Maybe make it 1 inch?

I use Larry Stewart's low volume pumps. He does the same. Shortens the gears and machines a "stuffer" plate to fill the gap. Not sure how else you would do it without shortening the shaft.

[Signman]

Have run the Stewart pump in my stocker. If you like make an offer and you can have it.

The Schuman pump is a good deal. You may need to do some fabrication to make their latest model work, you will not be disappointed.