Oil pressure sanity check

[ls1frc]

Hey all, figured I'd make a thread since my hot oil pressure is bothering me. I pulled my 5.3 out for a junkyard 6.2 with about 50k on it.

I replaced all the gaskets, put in a melling 10355 oil pump with standard spring, new VVT cam and Johnson 2110 lifters. I stupidly didn't plug the oil pan relief valve because I thought it was necessary for VVT. Turns out, only necessary for DOD lifters to not get overloaded.

Anyway, on cold starts my oil pressure pegs the relief valve at 55 psi. My moderately warm oil pressure is around 35 psi at idle.

Once it gets fully warm, over 200 degrees, I see 19-22 psi at 625 rpm. My 5.3 saw around 30-35 with a melling 10296 pump but it had a 3 bolt cam. I am not sure if the VVT cam will lower oil pressure over a regular cam.

I also read that people were reporting lower oil pressure with Johnson lifters. Also, I didn't plug my DOD oil holes, just relying on the valley cover. I read stories about these seeping and lowering oil pressure.

I don't have any abnormal noises and the truck runs great. It just seems lower than I figured it would be.

 

[ls1frc]

Forgot to mention, oil pressure climbs instantly with RPM. Like even a few hundred RPM drives it right north of 40. My thought process was if I had some looser tolerances, the oil pressure would be pretty bad at every RPM when warm.

Found many threads saying exactly what I am saying, so I guess I am good. Just figured the Melling would be higher.

https://www.silveradosierra.com/vor...le-and-driving-recommended-range-t410305.html

 

[Joseph Garcia]

For my 07 6.2 with a stock oil pump and with ~145,000 miles, when the oil is cold, the idle pressure is 40+ psi. When the oil is at operating temperature, the idle pressure is ~20 psi, 40 psi at 1500-1800 rpms, and 40-50 psi at higher rpms.

I hope that this is helpful to you, and other folks will chime in.

 

[ls1frc]

For my 07 6.2 with a stock oil pump and with ~145,000 miles, when the oil is cold, the idle pressure is 40+ psi. When the oil is at operating temperature, the idle pressure is ~20 psi, 40 psi at 1500-1800 rpms, and 40-50 psi at higher rpms.

I hope that this is helpful to you, and other folks will chime in.

That's good to hear, thanks.

 

[1BADI5]

Wow. I left my oil valve in the oil pan too.

NOTE: I did a VVT & AFM delete with the cam swap. I have almost 5500 miles on the build.

Cold/start up - 51-55psi
Op Temp - 41-45psi
Driving - 46-55psi

What color o ring did you use on your oil pick up tube?

 

[ls1frc]

Whatever one melling said to use in their kit for trucks, it was definitely the correct one. I believe the thick green one. I highly doubt it has any issues since I assembled it in my garage. Since your driving oil PSI closely matches mine, but my idle is way lower, I can only assume the VVT cam has something to do with it and it's just normal.

I am going to plug my DOD oil holes just incase since it's easy anyway.

Dropping the pan is a nightmare on the 4x4, and I really don't feel like doing that so the stupid relief valve will stay in.

 

[FrankU]

6.2 with @ 65K miles.

Cold start @ 40
Hot idle 25
Hot run 38

 

[1BADI5]

Whatever one melling said to use in their kit for trucks, it was definitely the correct one. I believe the thick green one. I highly doubt it has any issues since I assembled it in my garage. Since your driving oil PSI closely matches mine, but my idle is way lower, I can only assume the VVT cam has something to do with it and it's just normal.

I am going to plug my DOD oil holes just incase since it's easy anyway.

Dropping the pan is a nightmare on the 4x4, and I really don't feel like doing that so the stupid relief valve will stay in.

OK, sounds good!

What weight oil are you running and how much?

My tuner to me to run 10w30 and between 6-7 qts

 

[ls1frc]

I am running 5w-30 castrol magnetec. I ran 0w-40 for a bit and that idled at around 22-24 psi. I think I will run that for summer or the magnetec 10w-30.

Just ordered the DOD plugs, for the 2nd time. My original package said "delivered" but I never got it. TSP never responded to me. Fedex didn't seem to give a shit. I hate doing chargebacks since I am also a retail business owner, so I may just eat it.

 

[1BADI5]

Yeah thats a pain in the dick.

 

[Foggy]

I don't think you are too far off from normal 6.2 pressures
But definitely need those DOD holes plugged.. The valley cover will NOT
seal them.. There is oil seeping/pushing out from there for sure..
I think just doing that will put you where you should be

 

[ls1frc]

I don't think you are too far off from normal 6.2 pressures
But definitely need those DOD holes plugged.. The valley cover will NOT
seal them.. There is oil seeping/pushing out from there for sure..
I think just doing that will put you where you should be

Good to hear. That would make sense because colder oil is thick, so the o-rings may be sufficient. When the oil is hot and slippery I can see it creeping by at low rpm. I just ordered some from LSXacceleration and selected UPS this time.

 

[1BADI5]

^^ I just recently ordered some injectors from them. One of the most under rated LSX shops out there. Great prices and stupid fast shipping

 

[Foggy]

I have looked at some stuff on LSXceleration too... Haven't ordered anything,
but curious to see what others think of their products/services too

 

[ls1frc]

Anyone try to drop the pan like this guy does?

 

[Foggy]

"Don't take this whole thing out, it's just too much work"
I like it !!!!!!!!!!!!!!!!!!!!!!
Haven't HAD to do this yet , but i'm sure i will in the future...
On somebody's rig anyway
I'm thinkin about "while I'm in there" , I'll do a DOD delete cam AND
a 3.90 stroke 404 CI stroker LS3 to go under my supercharger... Yeah, that's the ticket

 

[iamdub]

I am running 5w-30 castrol magnetec. I ran 0w-40 for a bit and that idled at around 22-24 psi. I think I will run that for summer or the magnetec 10w-30.

Just ordered the DOD plugs, for the 2nd time. My original package said "delivered" but I never got it. TSP never responded to me. Fedex didn't seem to give a shit. I hate doing chargebacks since I am also a retail business owner, so I may just eat it.

 

[wjburken]

Anyone try to drop the pan like this guy does?

What he says makes sense. I think @Geotrash found he could do it this way on his ride.

 

[ls1frc]

Yeah paid $25 for the part and $15 to ship. It is what it is. They put the right address on it, so I am not going to make a big stink about it. It's really fedex's fault but they also don't give a shit.

 

[ls1frc]

What he says makes sense. I think @Geotrash found he could do it this way on his ride.

Yeah, still kicking myself for not plugging that dumb thing but at least it's good to see dropping the pan doesn't require dropping the diff.

I doubt the relief valve causes issues at idle though. I probably don't even have any issues and I am just chasing ghosts.