Sudden Oil pressure lose, want to confirm what I found
04-16-2014, 08:44 AM
#1
Teching In
Thread Starter
iTrader: (1)
Join Date: Dec 2006
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
Sudden Oil pressure lose, want to confirm what I found We had a fresh built ls2 based 402 that had about 300 miles on it. Had great oil pressure, 45psi at hot idle, 60psi cruise.
We were doing WOT tuning and immediately after noticed the pressure was down to 15psi hot idle, so knew something wasn't right. Car didn't make any sounds. Unfortunately, the owner drove the car home.
First thing I checked was the pickup tube O ring. That looked fine, but put a new one in, and no change.
Last night we pulled the engine, and noticed the barbell has dislodged itself. It was a brand new one with the build, so not sure how it came lose, but guessing that was our pressure loss?
Me being a touch OCD, decided to keep tearing into the engine, and noticed that the time the engine ran with reduced pressure must have hurt us. The rod bearings all appear to be wiped out. I pulled the mains and they look ok, but going to have the machine shop double check anyway.
So my theory at this point is,
WOT oil pressure somehow knocked barbell lose
Reduced pressure caused lack of proper oil to the rod bearings which ended up killing them
Thoughts?
We were doing WOT tuning and immediately after noticed the pressure was down to 15psi hot idle, so knew something wasn't right. Car didn't make any sounds. Unfortunately, the owner drove the car home.
First thing I checked was the pickup tube O ring. That looked fine, but put a new one in, and no change.
Last night we pulled the engine, and noticed the barbell has dislodged itself. It was a brand new one with the build, so not sure how it came lose, but guessing that was our pressure loss?
Me being a touch OCD, decided to keep tearing into the engine, and noticed that the time the engine ran with reduced pressure must have hurt us. The rod bearings all appear to be wiped out. I pulled the mains and they look ok, but going to have the machine shop double check anyway.
So my theory at this point is,
WOT oil pressure somehow knocked barbell lose
Reduced pressure caused lack of proper oil to the rod bearings which ended up killing them
Thoughts?
04-16-2014, 07:08 PM
#4
Pickup location in those pans sucks. The pickup needs to be 1/4 to 3/8 max
The pickup is in the center of the pan oil is running away from it under acceleration.
I would want more oil pump with some mods to the pickup tube and inlet.
I use Schumann pumps from car shop inc
Tim
The pickup is in the center of the pan oil is running away from it under acceleration.
I would want more oil pump with some mods to the pickup tube and inlet.
I use Schumann pumps from car shop inc
Tim
04-16-2014, 09:42 PM
#5
We had a fresh built ls2 based 402 that had about 300 miles on it. Had great oil pressure, 45psi at hot idle, 60psi cruise.
We were doing WOT tuning and immediately after noticed the pressure was down to 15psi hot idle, so knew something wasn't right. Car didn't make any sounds. Unfortunately, the owner drove the car home.
First thing I checked was the pickup tube O ring. That looked fine, but put a new one in, and no change.
Last night we pulled the engine, and noticed the barbell has dislodged itself. It was a brand new one with the build, so not sure how it came lose, but guessing that was our pressure loss?
Me being a touch OCD, decided to keep tearing into the engine, and noticed that the time the engine ran with reduced pressure must have hurt us. The rod bearings all appear to be wiped out. I pulled the mains and they look ok, but going to have the machine shop double check anyway.
So my theory at this point is,
WOT oil pressure somehow knocked barbell lose
Reduced pressure caused lack of proper oil to the rod bearings which ended up killing them
Thoughts?
We were doing WOT tuning and immediately after noticed the pressure was down to 15psi hot idle, so knew something wasn't right. Car didn't make any sounds. Unfortunately, the owner drove the car home.
First thing I checked was the pickup tube O ring. That looked fine, but put a new one in, and no change.
Last night we pulled the engine, and noticed the barbell has dislodged itself. It was a brand new one with the build, so not sure how it came lose, but guessing that was our pressure loss?
Me being a touch OCD, decided to keep tearing into the engine, and noticed that the time the engine ran with reduced pressure must have hurt us. The rod bearings all appear to be wiped out. I pulled the mains and they look ok, but going to have the machine shop double check anyway.
So my theory at this point is,
WOT oil pressure somehow knocked barbell lose
Reduced pressure caused lack of proper oil to the rod bearings which ended up killing them
Thoughts?