Matty's first 1st Gen

Hey guys, On my recent rebuild I'm getting about 65 PSI max at about 3 and a half grand and any higher up it drops to 60. I'm also getting a decent 25 PSI at idle, and I'm using a Mechanical gauge so i know its accurate. I had the exact same problem before i rebuilt the engine. In this new engine i have a new oil pump, and Modified oil pressure regulator to allow for up to 80 PSI. I also am using a second gen oil cooler. My question is would running oil lines with a thinner I.D. than the stock lines create less flow, and a oil pressure loss like i am experienceing? My current custom made lines are fairly thinner compaired to the Stock lines. Would it be benificial also to get thicker I.D. lines than stock if i have to replace them?

Thanks, Matt

trochoid

iTrader: (6)

It's possible, what is the inside id of the new lines, stock is a hair under 1/2"

Matty's first 1st Gen

I think the ID of the new lines are 3/8. Or should i be looking for a different problem area?

trochoid

iTrader: (6)

Are the oil pressure readings the same warm/cold, and what weight oil?

Matty's first 1st Gen

its 10W30, and when cold it reads a max of 70 PSI untill warm

Matty's first 1st Gen

I'm thinking about switching to 20W50 once the engine is propperly broken in

trochoid

iTrader: (6)

That will bring it up, especially cold. I hit 100 on 10w30 and 125 on 20w50, cold. Still goes down to 50-75 psi warm, above 3k. I have the RB opr too.

Jeff20B

iTrader: (13)

I added washers to an adjustable OPR in a recent rebuild and test cranked it with 20w50. I cranked it on and off for a while until it started showing some pressure. Then I cranked it on and off a few more times and watched it pass the 50 psi mark on the guage. Gulp.

The old engine wouldn't go much past 60.

Matty's first 1st Gen

So is it decided, should i change my line for thicker ID ones? i did a run to 6 grand and it dropped to 50 PSI

trochoid

iTrader: (6)

I would give it a try, i'ts fairly simple/easy and doesn't require opening anything up. If that doesn't work, then I would drop the oil pan and check both oil regulators.

Matty's first 1st Gen

Could the rear oil pressure regulator cause this, because i didn't touch it during the rebuild.

trochoid

iTrader: (6)

The rear one is what controls oil pressure, the front one is a relief vavle. You said you modified the opr, that should be the rear one.

Matty's first 1st Gen

My appologies, I did modify the rear one, sorry i got a bit confused there. The question should be if the relief valve could cause this problem?

trochoid

iTrader: (6)

Front one is a possible candidate.

Matty's first 1st Gen

Went for a boot tonight and i had some questions. first off the oil pressure at 6 grand on the highway dropped to about 50-55 PSI, and also i think my temps are a little on the low side, The coolant was 160 degrees, and the oil temps were staying at 145-150. Are these temps ok, i'm running a cooler thermostat and a second gen oil cooler.

Siraniko

iTrader: (13)

If its a real modded ROPR, the oil pressure shouldn't drop below 60 when hot.

with the smaller ID oil cooler lines, no clue.

Matty's first 1st Gen

I guess i'll buy new lines, hopefully that helps. WHat is a good AN size for the lines?

Siraniko

iTrader: (13)

With all my cars and most installs, I get the lines replaced with stock end fittings to save $$$. Thats roughly $70 vs $110+ for steelbraided/inlet fittings.

KBSRX7

What was the reason? Anyone figure it out. I have the same problem! New oil pump and added a second cooler, but I didn't touch the regulator. My cars showing like 60PSI at idle and goes down slightly on accereration? WTF? I talked to many people and they said if it was the regulator mostly likey it wouldn't have much pressure at all. Can someone please verify this.

Siraniko

iTrader: (13)

60 PSI @ idle using stock oil pressure gauge OR aftermarket mechanical.