Another oil pressure issue (found bad SLP pump)
#1
Another oil pressure issue (found bad SLP pump)
We just fired a new motor, forged 370, new pump and everything. We first fired the motor, there was 0 oil pressure on the factory gauge. The valve train got quiet almost instantly and we pulled the turbo feed off and there was a solid stream of oil coming out.
We replaced the factory sender and now have pressure, but is low at cold start.
I installed a mechanical pressure gauge at the end of the pressure supply line at the turbo, pressure jumped around at 40psi then dropped to 10psi, quick snap of the throttle and it spiked to 40-50.
oil pressure is only low at start up, sometimes the low oil pressure warning display comes up but is rare, after the engine is warm, about a couple min of driving, oil pressure holds around 40-50 psi, give or take watching the factory gauge.
We replaced the factory sender and now have pressure, but is low at cold start.
I installed a mechanical pressure gauge at the end of the pressure supply line at the turbo, pressure jumped around at 40psi then dropped to 10psi, quick snap of the throttle and it spiked to 40-50.
oil pressure is only low at start up, sometimes the low oil pressure warning display comes up but is rare, after the engine is warm, about a couple min of driving, oil pressure holds around 40-50 psi, give or take watching the factory gauge.
Last edited by LAFNZ06; 11-20-2010 at 12:09 PM.
#3
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did you reuse an old oil pump oring? Did a cam swap once and the oring was visibly fine and I didnt pinch it but when it didnt seal and we got a new one the new one was visibly squishier and fatter. Maybe an old oring is having to get hot and expand before it seals
#4
The engine was assembled from the builder, I pulled the pump out last night. Found this SLP pump was not clearances for the double roller chain, the chain hit the pump. When the pump was bolted on, it must have bowed slightly at the pressure port, once the engine got hot, everything expanded and it would sustain decent oil pressure. I have a new pump and chain on the way.
#7
We set the SLP pump side by side, the one on my motor had a noticeable height difference from the mounting bosses outward. We mocked both up on another motor and there was a .050" to .150" difference. Bad pump out of the box, strange...