STAR

iTrader: (1)

Hey guys, need some suggestions and opinions on what I should do. I have a fully built forged motor and I'm using a ported and shimmed ls6 oil pump. At cold idle I see 49 psi pressure and 220 degrees hot I see 24 psi at idle. Problem is oil pressure does build with rpms, but maxes out at 48 psi at anything over 5000 rpms. This scares me as I want to pull the motor to 6500-6800 rpms. Why does the pressure not increase anymore? Any suggestions?

dre2013

iTrader: (7)

o-ring seated properly? and have you verified these numbers on a mechanical gauge? my stock oil pump with 140k on it holds 40psi warm idle..

Marc 85Z28

iTrader: (8)

While you may still have a problem, 48psi is plenty of pressure for 7000rpm. 24psi at idle is also more than adequate.

bigboykilroy

iTrader: (48)

I use the old rule of 10 psi per 1000.
I love my meling pump.

98Aggie

iTrader: (19)

Is this a new motor - never run before?
What are your bearing clearance set at?

STAR

iTrader: (1)

Yes its a new motor that has about 600 miles and everything seems fine. I think the mains are at .002 and the rods at .0025 if memory serves me corrrect.
Considering upgrading to a melling 296 pump.

05 GSXR 1XXX

iTrader: (16)

pinched o ring?

SweetS10V8

iTrader: (4)

Key word is old, almost a wives tail now.... You dont need anywhere near 10psi/1000 RPM.

This engine has plenty of pressure to survive. Doesnt mean there isnt anything wrong, but doesnt mean that there is either....

STAR

iTrader: (1)

Don't know if the o-ring is pinched until I take it apart, but I doubt it. It seems like I'm bleeding off pressure somewhere? Or just simply the oil pump is not providing enough volume?

bigboykilroy

iTrader: (48)

I wouldnt run an engine at 7000 with 48psi, go with the Melling 10296 Oil Pump.
also make sure the oil pressure sending unit isnt damaged, test the pressure with a mecanial reader to be sure of the pressure.

bigboykilroy

iTrader: (48)

actually after thinking,,,,,if it wont build pressure over 48 psi i bet the pressure blead off spring is defective (in the oil pump)
mechanical test then order a Melling 10296 Oil Pump to replace it.

muayyadf1

try to change oil + filter

bigboykilroy

iTrader: (48)

Yes I forgot about that as well, if its a fram get rid of it !!

I only use Napa gold (Wix)

SweetS10V8

iTrader: (4)

You would be surprised how bad things have to be for an engine to die. 3v fords only have about 35psi at 7000 RPM.

Ive also run ZZ4s to 7000RPM at 25psi and never had a problem, even tore apart the bottom end and all the bearings looked perfect.

I would find out if indeed it is possible to have a mechanical bleed off, or if something is wrong causing it to bleed.

Super Speed

iTrader: (8)

Try running a thicker oil if you want more PSI...

Breathing Fire

Try the easy stuff first. Change oil and filter. I used a fram once because my usual ac delco was out of stock that day. Lost 15psi of oil pressure. Fram=****!

Super Speed

iTrader: (8)

I use a WIX filter!

ehnihl

I use a WIX filter too...

01formula6

iTrader: (7)

And I've spun a bearing running a ZZ4 to 5500 with only about 15-20psi...just saying. I don't trust things when oil pressure gets that low.

SweetS10V8

iTrader: (4)

Im not disagreeing, Im just saying 48psi isnt that low...