turbotuner20v

I'd much rather have high oil pressure vs. low, but the pressure readings with the new melling 10296 are so much higher than my old stock pump/motor that I just wanted to double check what pressure is ok.

I'm still running Joe Gibbs BR30 break in oil, and the oil has a cold idle around 60psi, then drops to ~50psi hot (205*F @ idle). As RPMs increase, the pressure increases, and I'm just curious if there is a 'max' I should be worried about exceeding. I'm pretty sure it'll max out the stock gauge which only reads up to 80psi.

Realcanuk

I'm curious what you figure out here. Everyone seems to run the 10296 but my builder told me to run the 10295 and uses that on all his builds. I haven't run my new engine yet but will definitely be watching the pressure when I do next week.

CAMSTER

iTrader: (10)

I say 75 psi is safe but above 80 will likely scuff the bearings, a friend seen 120 psi on the dyno, that will likely never happen to me sense i clean up the pressure bleed port and seen it very compromised with overcasting every time i look into 'em.

turbotuner20v

so is your friend having any issues at 120 psi?

Gray86hatch

iTrader: (83)

Mine makes 105 on a pass bearings looked perfect. 7500 rpm. Few other guys running the pump I use see the same thing and the engines look really good during inspection.

Tim

427zm

iTrader: (9)

I am running the 10295. It'll run 65psi @ cold idle, and 40@ hot idle.

vx355

Just a side note, when you increase pressure you increase the temp of the oil. So seriously think about weight and thermal properties if pressures are going to be high.

Realcanuk

Interesting. That is about what I would hope to see. I thought the 10295 was higher pressure than the 10296. I wonder why the op is getting higher pressure hot.

turbotuner20v

Good to know. I'm tuning the car this weekend, so it'll be the first time it sees redline, so I could very well see that much pressure (not sure if I'd know on the stock gauge though, maybe I can log it and the table won't max at 80psi like the gauge does?)

turbotuner20v

I'm planning to run Joe Gibbs LS30 oil, so it will be on the lighter side compared to what some people run

turbotuner20v

The 10295 is high pressure, the 10296 is high pressure/high volume. I think the 10296 also comes with a regular spring to make it regular pressure/high volume.

Realcanuk

The 10295 came with an extra spring also. My builder sent me a ported pump and I will also be running Joe Gibbs... break in oil and then LS30.

3.8redbird

iTrader: (3)

Buddy of mine sees 95-100 psi at 7500-8000 and his engine is still purring like a kitten. A pissed off turboed kitten but no shaving in the oil and everything looked great the last tear down.

Realcanuk

The pressure must be related to bearing clearances also, so I would use whatever pump is recommended by the engine builder, if having an engine built.

CAMSTER

iTrader: (10)

He took that pump out rite away.

Any more than 80 psi is a lot of pressure, bearing babbitt is not that hard, you need to know what you are looking for to find scuff bearings, in the flip side, i rather have scuff bearings than low pressure and worrying. 90 psi is where i drow the line.

KCS

iTrader: (20)

It certainly is. Bigger clearances are usually needed for bigger power, but the increase in clearance gives more area for oil to flow and causes a drop in pressure. I set my clearances at about .0022" and hot idle gets to about 35psi with the 10296 and the blue spring.

Realcanuk

My clearances are .0025. Maybe that is why I was recommended the 10295 high pressure pump.

JakeFusion

iTrader: (7)

Pressure you see is directly related to the bearing clearance. A high flow pump simply moves more oil and depends on the bearing clearance for the pressure you see on your gauge. The "high pressure" pumps are related to the bypass spring. The 10295 is no where near as thick as the 10296, because the gerotor in the 10296 is like 23% larger and thus moves a lot more oil.

The only way to add pressure is to increase oil volume for a given clearance or change the clearances.

427zm

iTrader: (9)

Jake Fusion on point once again. Sounds like the 10296 is a beast of a pump.

JakeFusion

iTrader: (7)

Good luck fitting a double roller in there. 10295 I think you still can with a little grinding. 10296 certainly outflows the ported LS6 pumps and doesn't fall off like a rock at 6000+ like the LS6 pump does.