oil pump question

gunmetal72 said

http://www.summitracing.com/dom/sea...amily/mopar-small-block-la?retaillocation=dom

would this pump have more pressure than the stock pump and would it sit lower in the pan where I would not be able to use the splash pan? If it does have more pressure, would it be better to change out the spring from the standard pump. The engine should have good pressure because it is a fresh build but more volume at idle would be the bug gain? I have had oil pressure issues in other engines at low rpm but that also might be because of bigger clearances in the bearings.

Click to expand...

That is the standard Melling SBM HV pump. It will have the same pressure after reaching the pressure limit as a standard pump if the same spring is used in the pressure relief valve.

I would expect that PN to have the heavier spring with a 72 psi limit. Either pump can have/use the heavier or lighter spring; it all depends on the spring wire diameter.

Yes, more volume (due to more pressure) at idle and low RPM's would be the difference. I don't get too awfully excited at the difference as it is only 18-20% flow difference, tops. I can't tell you the pressure difference at, say 1000 RPM; I have no data on that.

What do you mean 'splash pan'? Is that the windage tray? It should fit either pump. It bolts into the engine in the same way.

BTW, are you replacing the intermediate shaft that drives the pump?