siegler
Registered User
The mcmaster carr spring got installed yesterday, along with the regulator valve from my broken header and another bundle that I cleaned (just in case the one on the engine was plugged...). Made no difference. 20 psi cold idle, 30 psi cold at 2000 rpm or over. 10 psi hot idle, 20-25 psi hot at 2000 rpm or over.
I DID find the specs for the oem spring in the service manual though. 1.547" free length, 0.915" test length, 5.82+/-0.29lbs test load. That gives a spring rate of 8.75-9.75 lb/in. After measuring the regulating valve where pressure acts on to open the valve and lots of calculating the oem spring allows the valve to open at 50-58 psi, where the mcmaster carr one opens at about 57-58 psi. Valve would be bottomed out (all the way open) at 71-72 psi with the oem spring and 73-74 psi with the mcmaster carr spring. That is really close.
I'm going to say the issue is probably not the spring. What else can it be. Oil isn't foamy after a run, so I think the pick up tube is ok, plugged pick up maybe? Oil jet came out after less than 50 miles of use? oil pump is actually weak? Oil pump didn't get mounted quite perfect and is bleeding by on the mounting face? Reading oil pressure at the turbo isn't the best place and I actually don't have low pressure?
Here is the pressure sensor for my gauge. It's all 1/4" pipe there fed by and 1/8" hose coming from the oil gallery at the bottom rear of the block on the driver's side.
I DID find the specs for the oem spring in the service manual though. 1.547" free length, 0.915" test length, 5.82+/-0.29lbs test load. That gives a spring rate of 8.75-9.75 lb/in. After measuring the regulating valve where pressure acts on to open the valve and lots of calculating the oem spring allows the valve to open at 50-58 psi, where the mcmaster carr one opens at about 57-58 psi. Valve would be bottomed out (all the way open) at 71-72 psi with the oem spring and 73-74 psi with the mcmaster carr spring. That is really close.
I'm going to say the issue is probably not the spring. What else can it be. Oil isn't foamy after a run, so I think the pick up tube is ok, plugged pick up maybe? Oil jet came out after less than 50 miles of use? oil pump is actually weak? Oil pump didn't get mounted quite perfect and is bleeding by on the mounting face? Reading oil pressure at the turbo isn't the best place and I actually don't have low pressure?
Here is the pressure sensor for my gauge. It's all 1/4" pipe there fed by and 1/8" hose coming from the oil gallery at the bottom rear of the block on the driver's side.
You must be registered for see images attach