[BruceWilkie]

Originally Posted by johnta1

If it's a 60 PSI pump how would you get more than that out of it?

455 SD's were 80 PSI

Change regulator spring or shim it or modify spring cap so you can make it adjustable.

[GTOGEORGE]

Originally Posted by BruceWilkie

Change regulator spring or shim it or modify spring cap so you can make it adjustable.

Ive changed springs and also I've shimmed the spring (changed caps).....at one time i had 100psi with the same configuration I had in my mellings pump (purple spring)! The Butler pump comes with the same yellow spring thats in the mellings 60psi pump. So I took the mellings cap off and reinstalled the Bultler cap (one cap is deeper then the other), with the same purple spring that was in my mellings pump....now I'm only getting 45psi and that it. Just doesn't make sense psi should be at least 70?

GTO George

[Tom Vaught]

Originally Posted by GTOGEORGE

The Butler pump comes with the same yellow spring thats in the mellings 60psi pump. So I took the mellings cap off and reinstalled the Bultler cap (one cap is deeper then the other), with the same purple spring that was in my mellings pump....now I'm only getting 45psi and that it. Just doesn't make sense psi should be at least 70? GTO George

If you have the Deeper Cap (probably the stock Melling Pump Cap on the pump and the Butler cap is shallower (with the same spring to compensate for the smaller ball installed in the Butler Pumps so debris does not hang them open) you basically put even less preload on the spring so the pressure went even lower.

You should have shallow cover, smaller diameter ball, and purple spring stock from Butler.
Then if you add a spring washer shim to that set-up you should be able to bump the oil pressure up even a bit more.

Tom V.

[johnta1]

The longer housing requires a longer spring.
The longer spring can be stronger because there is room for more coils.
About like valve coil spring installed height.
Also with a short spring in the longer housing it may not be doing anything?
(unless shimmed a lot for the extra length of housing)