Hey guys,
Has anyone upgraded to a high volume or high pressure oil pump?
I'm replacing my 1991 302 oil pan and I figured why not upgrade while I'm at it.
Any recommendations would be helpful.

Jerry D.

 

I have a high volume moroso and I like it. Probably worth doin since you're gonna have the pan off anyway
High pressure pumps can cause more problems with oil leaks than they're probably worth, besides for cooling and wear resistance I think you need the volume, not the pressure.
I've never experienced the problem but several people have said ford oil pumps are notorious for going out

 

I wouldn't do it. It wouldnt be a bad idea to replace it, but I wouldn't go with a high volume. It pumps more oil, BUT robs more power(although you probably wont notice) and it puts a lot more stress on the oil pump shaft and cam/distributor gear. I have seen several twisted oil pump shafts caused by a high volume pump trying to pump really cold oil during startup (in winter). The only time I would ever use one is in a wore out engine as a band aid for wore out bearings.
Just my .02

 

Thanks for all the replies!
I think I just might buy a Melling oil pump. I really don't want any more problems or new leaks.
Just to give you an idea, my 302 has around 40K on the rebuilt engine. I just installed a FMS A312 cam and all new valve train comps. Oil pressure runs at 45 psi at idle and 55 at higher Rpm's.

Thanks again.
Jerry D

 

45psi

 

45 psi is good right????
In my Chiltons it says it should range from 40-60 psi.

 

is good.

 

If its that good, dont fix it if it aint broke

 

There is nothing wrong with going with a high volume pump . i did and i haven't had any problems from it . a high volume pump doesn't increase pressure , it increases volume. pumps more oil . the also make a high pressure pump if your having pressure problems. there is a difference !! one thing you'll need to keep in mind if you do is run a higher level of oil so it doesn't suck the pan dry .

 

I have a question for you all. Say I have a garden hose running at 5 gallons a minute and I increase it to 7 gallons a minute. if I don't change the size of the hose what is going to happen to the pressure?

 

If you increase the volume of water to 7 gallons per minute without changing the size of the hose, then you must increase the velocity of water flow to account for the difference in volume. But is this analogous to the oil pump? Maybe the oil pump is larger to account for the difference in the volume of oil in order to keep the oil pressure constant? I'm not sure exactly how the oil pump functions and works so I couldn't tell you exactly what goes on there. :o

 

A high volume pump requires more of the energy that your engine has to offer, which means it will take away from the power to the wheels. You may or may not be able to detect it SOTP, but on a dyno, a high volume pump always robs power.

Do as you wish, but I would go with a stock replacement. Mellings are killer pumps.

 

OIL PRESSURE i don't know much about but high volume should have some pressure behind it my lightning when it is warm runs about 45 # pressure