- Joined
- May 28, 2003
- Messages
- 2,591
I recently got an oil pump to test and I told my friend if he wanted , I'll do an OPV test too.
So in this case I saw a new over pressure valve...
New style manufacturing process of the screen crimp that I had never seen before. When I screwed it into the timing cover I noticed the threads were not nearly as sloppy as OEM.
Also the thread placement was skewed a bit from all my old oem factory valves.
In operation I saw that with the valve still closed there was measurably less than the normal thread bypass leakage.
Next when the speed/pressure was run up to bypass opening, which was well within the normal range around 50 PSI, as the pump speed was run up and flow increases the spring linearity deflection caused the OPV pressure to stay much more constant then the normal increasing pressure to as much as 70 PSI at high speed..
I didn't take data or ask where it was sourced but the performance difference was very significant.
So in this case I saw a new over pressure valve...
New style manufacturing process of the screen crimp that I had never seen before. When I screwed it into the timing cover I noticed the threads were not nearly as sloppy as OEM.
Also the thread placement was skewed a bit from all my old oem factory valves.
In operation I saw that with the valve still closed there was measurably less than the normal thread bypass leakage.
Next when the speed/pressure was run up to bypass opening, which was well within the normal range around 50 PSI, as the pump speed was run up and flow increases the spring linearity deflection caused the OPV pressure to stay much more constant then the normal increasing pressure to as much as 70 PSI at high speed..
I didn't take data or ask where it was sourced but the performance difference was very significant.
