Mi Oil Pressure

[screwloose 6]

I have just finished doing a few bits to my Mi like manifiold, cambelt change, fitted mocal oil cooler (oil and filter change done too), un-tilted the engine so more like the angle it should be. Anyway I have also just fitted a mechanical oil pressure gauge and would welcome some thoughts on its readings.

 

Before the above bits were done on the car it ran very healthy oil pressure - over 3/4 cold idle and when under load pretty much the top of the gauge all this on the standard gauge. Never suffered any oil surge etc etc so I was very happy.

Having run the car properly for the first time since the work my cold idle pressure on both the OE gauge and mechanical gauge is at 45-50 PSI and when under load doesn't budge over 60 psi. It reaches 60psi from 4k onwards all the way to 7200k which is where i dared rev to - doesn move any higher on either gauge.

 

Going through some older threads it seems a healthy Mi should be more like 70psi cold idle rising to 80psi+ under load/high revs.

 

The engine has done 19k since complete rebuild previous owner had done, forged internals, running carbs, PT1604 cams.

 

The car is on a track day this Saturday - is it making enough oil pressure so as not to damage the engine?

 

Any ideas on how i can raise the oil pressure? I've heard a Gti6 pump literally bolts staright on and should make more pressure.

 

thanks for any help guys!

 

Jonny.

[PVFCpug 6]

That does appear high TBH in comparison to mine which is on a Dry Sump and external Pump. Mine is of course totally rev dependant but I see starting pressure of 90 at idle , 120 revving (No temp reading). Normal 40 idle, 70 revving (80-90 Degree's), Track abuse Hot 20 idle 60 revving (100-110 Degree's). My thoughts are as long as you get good pressure when revving, and it is flowing well when idle all should be OK.

Edited April 19, 2010 by PVFCpug

[Henry 1.9GTi 36]

60psi seems about right for a 4 bar spring.

 

My Mi was much the same. Got Very very low on hot idle. 120degrees or so (sump temp) was only about 10 psi using 10W-40 semi syn and about 15-20psi using 10W-50 ester fully syn.