I purchased a high volume oil pump a while back for my 351W build, but have recently learned that it really isnt nessesary for a new (non race) motor. I read that you lose HP by running one. If that is true then Im wondering how much HP you lose. Is it worth buying a standard pump instead? They are relatively cheap but if its a nery nominal loss Im wondering if I should just throw it in there.

 

I dunno if anyone has ever quantitatively measured HP loss on the pump types...and whatever it is, ford is far less susceptible than a SBC given the passage size..

at any rate- I recommend them, but WITHOUT the high pressure spring. Very few people need 80psi.

I lot of people come to me for a 'refresh' of a tired engine. For that I change the rods and mains with STD size bearings (I dont even measure, unless there is some real obvious damage for the simple point that fresh STD clearance is better than worn STD clearance), hivol oil pump, new headgaskets, and recut the valves (this is often overlooked - in the world of high volume manufacturing, the automakers just cut the face angle and let the valve pound in the seat angle) and sometimes rings if the taper is not too bad - with a bottle brush hone.

getting back lost oil pressure will meake it last nearly as long as a complete reman.

now for your engine, I assume 'build' means everything - drilled, decked, new slugs, reman crank, rods etc.

since you 'own' this engine, lower the engine oil one grade (i.e. instead of 10-40 try 10-30, instead of 10-30 goto 5-30), use synthetic, and use the hivol pump. but not the high pressure spring - get a NEW standard spring (melling pump kits thru napa come with both and instructions on how to swap)

 

Thanks for the info. The block has already been machined and cleaned and I'll be using new rods, crank, and pistons. The pump I have says nothing about high pressure anywhere on the packaging. Only that it is a high volume pump. Since I already have it I guess I'll put it on.

 

One thing I always do is adjust the collar on a new pump drive shaft.

 

Can you explain that? I have an ARP shaft.

 

Put the pump, gasket, drive shaft in. Lift the shaft up & down. If it is close to comming out of the pump when lifted up, slide the collar up some.

 

I wouldn't use a HV pump if you don't need it. I know a few guys that have had cams-distributor gears get wiped out from turning the HV pump.

 

I have the same problem, same pump amd similar aftermarket shaft. The motor I'm building didn't have one on it either, so I need to find one somewhere.