LPO Dropping on Drag Truck

dthompson · May 1, 2015

Ok, truck has 350/400's from unlimited and a srp1 pump but anyway upon acceleration the low pressure oil drops significantly. I know that I've seen others have this issue. Been told possibly blew a galley plug out the rear of the engine. Any other possible options? Thanks guys.

OBS-Addiction97 · May 2, 2015

What LPOP are you using?

02BigD · May 2, 2015

:whs:

dthompson · May 2, 2015

Stock as far as I know. It kinda jumps at idle then gradually goes down even just off idle.

DW Adam · May 2, 2015

Sounds like the hpop is starving for oil. DieselSite and Melling make lpop's that flow more oil. Your stock one can't keep up with the demand.

isootmypants · May 3, 2015

Take off balancer and lpop, check for wear or grooves on pump or front cover.

dthompson · May 3, 2015

I've got a melling pump from another project so I guess I'll start there probably. Just thought I'd check to see if there was something else.

isootmypants · May 3, 2015

I'd start at lpop. Easiest

dthompson · May 16, 2015

Alright, going to try to do lpop in the next few days, but have noticed that when the engine is cold it's worse like almost no pressure even at idle. As it warms up it's better. But even sitting there once you give it any throttle the pressure falls off. Doesn't seem like the pump would have these symptoms. Am I wrong? Why is there more pressure with hot oil. I'm wondering about the galley plugs on the back of the engine....

ghohouston · May 16, 2015

^the gallery plugs have been brought up a few times on here, where they were left out on a rebuild, and would cause some issues. Don't remember if the trucks would even start when that happened though.

OBS-Addiction97 · May 16, 2015

Honestly i'd change the lpop and go from there. It's easy enough to swap in a few hours.

dthompson · May 20, 2015

Ok, I decided to toss a manual gauge on it. Plumbed into the port on the oil cooler and truck has 50psi at idle and up to 75 under throttle when warm.