Oil Pressure going away on KB Hemi

I have a KB Veney Hemi with a wet sump Dan Olsen oil pan, System 1 pump, System 1 filter. At idle (2000rpm) when warm its got around 30lbs which Im good with. All the way through the run it holds around 70lbs, which Im good with. As soon as I hit the chutes at 160 or so MPH I have zero oil pressure (Which Im not good with) for at least 5 seconds until the negative forces allow the oil to creep back into the rear of the pan. I use 17qts of Brad Penn 70wt. Seems like it just sucks the pan dry at will. Is there a place to restrict the amount of oil going to the lifters on a KB Hemi? Anybody else fight this?

 

Oil Issue

I have no experience with Hemi engines but if you hit the chutes and loose oil pressure sounds like you are plastering the oil in the front of the pan and exposing the pickup.
I will admit that I am not 100% sure of this due to the fact that you are using 17 qts of oil.

What type of baffling does the pan have?

Corey

 

It's a Dan Olsen pan with Windage tray, crank scraper and duel trap doors. I'm thinking a deeper pan or a accumulator will fix problem.

 

Standard main or 3 inch?

Also, are you using a top fuel style crank with a lot of bearing clearance?

 

STD main. Crank is a Bryant. Not sure on the bearing clearance.

 

I have a three quart accumulator. Got rid of my oil issue on my sbc, but i'm not a fan of the extra plumbing.

 

this is very common with a hemi wetsump pan. Not sure what king of pump you have but the pressure you talk about under load seems low. Dry sumps have really made the oiling system work for race clearances and a continuous oil supply. In my opinion, wet sumps work to a certain level and then they won't. Roots blown engines were Ok and then screws changed everything in the oiling system

 

Money Shot - Oil Pressure

You didn't say what size line you have between the pan & pump, makes a difference on a Hemi, especially when using 70wt oil. I think the pressure is low at idle and at rpm. Run a Hemi - 14-71, Moroso Pan w/ stripper & trap door next to pick up, Pluger pump with a -20 from the pan to the pump, idle 1800 - 2000 rpm with 125- 150 PSI & 200 PSI at 8000 RPM, have run 70 wt & 50 wt. Look at the lines & pump!
Good Luck!

 

Those pressures look low to me too, 70psi of oil pressure? I'd be looking for more like 170.

After my first year of hurting bearings we were told to turn the pump up and run heavy oil, so now its nitro 70 Brad Penn, 110-120psi idle pressure and 170-190 at rpm, right now I still have last years bearings in, they looked to good to throw away so i put em back in.

 

30# at idle?? Holy crap! That is WAY low!!! my KB olds idles at 70-80#

 

you should have 120lbs at idle i was told a long time ago a hemi needs 120lbs on the starting line and i always do 70 wt i perferr brad penn the old green oil

if you filter is dirty and it dont take much the oil pressure very low it could be fine one miniute and the next it could trash in it and the oil pressure would be low it happened to me one miniute it was fine started again very little oil pressure WTF it was the filter good luck

 

i dont know how you guys get so much oil presure at idle and stage, shure when you fire the motor cold its there but when things start warming up and expanding it soon goes down,
Iv run my motor for two years and never have more than 70 going to the start line, and its been as low as 40 if theres been a hold up and the motors hotter than usual, it always goes up at the hit runs aroung 130 the whole pass everything i have is new perhaps the nre heads extra oilers lose a bit but numbers like 200 scare me
i use 60 wt redline these things may be agricultural but there not that bad, id have thought if you need 200 psi to make it stay together its fucked already

 

oil pressure

Make sure you are running the right filter element in the canister. DO NOT run the fine one. when running anything thicker than 50 wt. Don

 

any way of identifying the fine filter without having a cource one to compare it?

 

The filter element should have a part # on the end of it . Go to the system 1 site and see which one you have .

 

The # for the nitro filter (50-70wt screen) is 512571. The number for the standard (finer screen) is 512561. Those are the numbers for the complete filter, not sure about the number on the screen itself.

 

oil pressure

How did you make out with the oil problem? I really wish guy's would let us all know what or if something worked out . That sure would help everyone else out. Don

 

Sorry Don, Havent been on in awhile. Ive been in Reno. Had to get out of Dallas and that 100+ degree heat for awhile.

I havent checked to see what filter element I have. Thats a great point. I put new rods and mains in it last weekend and also put a 3qt accumulator on it. Havent fired it up yet. We have a race on the 25th. Ill let everybody know how it goes.

Randy

 

Oil Pressure

Well, We put the 3qt accumulator on it and broke a lifter and a piston 1st round of qualifying so not much to say yet on the oiling problem. Pressure seems good so far.