PY Online Forums - Bringing the Pontiac Hobby Together

PY Online Forums - Bringing the Pontiac Hobby Together (https://forums.maxperformanceinc.com/forums/index.php)
-   Pontiac - Street (https://forums.maxperformanceinc.com/forums/forumdisplay.php?f=418)
-   -   New Oil Pump with Two Types of Springs (https://forums.maxperformanceinc.com/forums/showthread.php?t=451396)

65goatman 08-21-2005 05:16 PM
New Oil Pump with Two Types of Springs
 
When I received my Melling M54D-S oil pump it contained two springs of different size. One spring measures 1"-50/64 and the other is longer which came installed in the pump. Which spring is required for a stock 65 389 as there were no instructions included for choosing the right spring?

hal101 08-21-2005 05:28 PM
im sure eather one would work but i think the longer one will give you higher oil presher

pro-tour79 08-21-2005 05:33 PM
"presher" good thing Brian B.'s not around...LOL

Tom Vaught 08-21-2005 05:36 PM
The longer spring will give you about 60 psi at road speed.

The short one is about 40 psi for older 389 type cruiser vehicles that
old people drove and were never revved over 4000.

I would always use the longer spring except in a pure fuel economy vehicle where the shorter spring "might" take slightly less road hp.

Tom V.


All times are GMT -4. The time now is 05:57 PM.