[tofnbad]

Dumb ? time. I just bought a summit brand standard volume oil pump for a 72 402. it came with a spring. whats that for?

 

[engineguy]

That is a spring with a higher rate than the spring that is already installed in the pump. You can install the spare spring, if you want more oil pressure, but I recommend that you install the pump as-is. Your pump should have had an instruction sheet that explains the extra spring and how to install it. You know, that piece of paper that really didn't look very interesting - and probably just some guy's opinion anyway (LOL).

 

[SWHEATON]

M77 Melling std vol pump?

If so that the optionmal vette spring that gives the motor approx 6-10lbs more oil pressure with hot motor & oil which is very good to run ,so install it.

BTW,There should have been a slip of paper in the box explaining it was the optional hi psi vette spring.

Just for ref when i have used that same pump with and without that opt spring over the yrs in different (fresh with new bearings) bbc builds i have done hot oil psi at cruise /2200-2400 rpms is generaly (depeding on clearances & oil viscosity) 50lbs + - couple lbs & with the opt higer psi spring 58lbs + - couple lbs too.

Cold oil pressure with opt spring is approx 15lbs to as much as 20lbs higher then with the stock/std spring. That higher oil pressure cold mostly due the the fact the bottom end clearances are tighter with motor cold and also the oil isnt warmed up yet either.

Scott

 

[tofnbad]

Thanks for the answers.. i thought it should have had that boring paper called instructions with it but there was nothing u guys have clarified it though and i appreciate it