Oil Pressure Query

[Alex170984]

I wonder if you can shed any light on this potential issue…

My engine is from a corolla originally putting out 115hp, even though I was told it was the same engine from the MR2, this is not the case. The sump on the engine obviously doesn't come with the MR2 factory oil cooler outlet on it either.

I then rebuilt the engine, with bigger OEM pistons, changed the sump to an MR2 sump, so it’s got the outlet for the oil cooler pipes and installed the rest of the oil cooler recirculation components.

When the car was running before, I had no oil pressure issues and the gauge read correct when it was securely fastened to the sensor.

Since it’s been rebuilt, running but before the cambelt snapped, I had low oil pressure when the car was hot. There was a knocking noise, but I have since identified this as the cause to my cambelt issue (don’t ask!).

What I'm asking is, can the addition of the oil cooler, reduce the oil pressure?