[70bluegoat]

I have 461 street strip combo with a stock baffled pan should irun the 60 or 80 psi oil pump?

[Tim Corcoran]

The 60 psi pump is fine for most street strip cars but what some people do is get the 60 psi pump and put a .100" shim under the spring and it ends up around 65-70 depending on your clearances and the oil you use. The 80 psi pump robs hp and is over kill for most combos.

[grivera]

Some also replace the ball size from 5/8 to 9/16 and shim the spring to take up the difference in space. The smaller ball is intended to provide the clearance for debris to pass by that would otherwise cause the ball to get stuck.

[mgarblik]

First, I agree that a 60 PSI pump is more than enough pressure for almost any application. However, I am troubled by the "loss of HP" that is always mentioned in thread after thread about oil pumps. Has anyone actually found a way to measure this theoretical HP loss? We can run the oil pump on our funny car with a 1/2" drill motor at 200 PSI and not stall a little hand drill. I don't know the answer, but I would venture to guess the difference between a 60 and 80 lb. pump is less than 1 HP. Still think 60 is plenty though. If running Pro-Stock where every .1 HP means something, I think the HP loss from a spur gear oil pump is mostly an "urban legend". Would love to see some actual facts about this.

[Tom Vaught]

We have done oil system testing using the factory oil pump driven by the engine and by using a remote "oil cart" to feed the engine running the same test and found a very small difference in the HP of the engine. The oil cart had a 10 HP motor and was not working hard at all supplying force to the factory oil pump.

So I would say, based on that ACTUAL TESTING Mike, that the HP difference between a 60 PSI pump and a 80 PSI pump is minimal at best, at street rpm conditions.

Tom V.

[Elarson]

Aviad has an in-house oil pump dyno. They can run a 4-stage dry sump pump with a 3hp electric motor.

I used a 3-stage Moroso dry sump pump on a turbine test rig that we ran at NASA. I used a 5 hp electric motor and it acted like the pump wasn't even there.

Eric

[Blued and Painted]

Is this where nasa found out you can't run a hydraulic pump @ 110% without failure.

[tom s]

Not sure about HP loss but the factory used a larger dist gear with the 80 lb pump.There must have been some added wear for them to make that change.Engineers dont make changes because they felt like it?Tom

[Cliff R]

Run the 60lbs pump, it's fine for any of these engines. Make sure to effectively attach the pick-up to the pump, never rely on the "press fit" to keep it in place.

I don't advise welding them in place either, there are better and more effective way to attach the pick-up and keep it in place for the life of the engine......Cliff

[mgarblik]

The mechanical attachment method in the pic looks fine with a nylock nut. Couldn't see the other end. I have brazed the steel tube into the cast iron housing for years without issue. It's actually easy if everything is clean. Very important to remove the relief ball and spring if welding or brazing, you will effect the spring if you leave it in there.

[Squidward]

I did 60lb pump with shim washer for a little bump in pressure. I also lock wired the tube to the body of the pump. It reminded me of my days on submarines where we lock wired EVERYTHING.