Update: MC engine - low oil pressure

[Lines Peter]

Wouldn't you lose the oil supply to the turbo if you run w/o the thermostat
housing?  I'm pretty sure that would be a bad thing .  I'm anxiously
following the results of this diagnosis.  I'm in the middle of a KH/MC
hybrid rebuild right now.
I know I'm late to this thread, but the pressure values being measured don't
seem terribly low to me...  Is there something I've missed?
-Peter


> >I would suggest buying some AN caps or use some other means
> > to seal off the oil cooler fittings and see what happens.
>
> Good idea... I might see if the hose place has anything like this.  I
could
> also make a short bypass loop with the extra hose I have from the oil
cooler
> lines....

To remove the oil cooler system as a variable, you should be able to
undo and remove the thermostat/bracket assembly from the block, install
a nipple (from dealer or spare engine block) and put a filter directly
on the block.

Also, your pressure jumped to "almost reasonable" when you went to a
good filter.  Maybe now try some Xw50 weight oil?

btw, my 90Q doesn't run as high (on their respective stock gauges,
though) as my coupe.  The 90Q pegs when revved cold, but when warm only
shows about 1.5 bar at idle, 3.5 or so revved.