Oil pressure readings

[930slant]

My 88 930 with 68,000 miles runs well, pulls hard, and burns no oil. I’m curious if my oil pressure readings are ok and how they compare with other similar cars.

When driving at 60mph, with car warmed up, the needle was steady at the 4 mark. After accelerating twice in 2nd gear to 6,000 rpm, the needle was steady at a tick just above the 3 mark at 60mph in 4th gear. So basically the needle reading after the 6,000 rpm accelerations dropped from 4 to 3.

It remained steady at the 3 mark until I parked. At idle the needle dropped to the 2 mark and stayed there for the 2 minutes I let the engine idle to cool down.

Do these reading sound normal?

Thanks!

[Alan L]

As a rule of thumb, rpm xK + 1.
Eg 3000 rpm, 4 bar. Or somewhere close. Idle, 2 bar.
Alan

[stownsen914]

Agreed with the above. I'd wonder why the change from 4 bar to 3 bar at 60 mph after a couple acceleration runs though. What changed? Were you in 4th gear both times? Did the oil temp increase?

[mark houghton]

Originally Posted by stownsen914

Agreed with the above. I'd wonder why the change from 4 bar to 3 bar at 60 mph after a couple acceleration runs though. What changed? Were you in 4th gear both times? Did the oil temp increase?

My concern as well

[930slant]

Yea. The 4 bar to 3 after two hard accelerations in 2nd to 5800 rpm is a mystery to me since the readings were noticed when both were in 4th gear. I’m not hearing any strange noises and under boost there is no sudden puff of smoke.

I’ll get out again this week and see if the 4 to 3 bar shows up again.

Thanks for your input!

[930slant]

Oh, and oil temp did go up a bit but nothing unusual.

[gorskined]

After reading some comments here, im starting to second guess the oil pressure in my newly rebuilt engine 76 3.0lrow turbo .

in using Mobil 1 15w50 full synthetic
at operating temp 100c oil temp

950 rpm 1 bar
2000 rpms at 2 bar
4100 rpm im at 4 bar .
would a 20w 50 help with the lower oil pressure at idle? also im not running oil restrictors on the cam towers. The motor had them prior to my ownership.
should i be concerned ?

[mark houghton]

Originally Posted by gorskined

After reading some comments here, im starting to second guess the oil pressure in my newly rebuilt engine 76 3.0lrow turbo .

in using Mobil 1 15w50 full synthetic
at operating temp 100c oil temp

950 rpm 1 bar
2000 rpms at 2 bar
4100 rpm im at 4 bar .
would a 20w 50 help with the lower oil pressure at idle? also im not running oil restrictors on the cam towers. The motor had them prior to my ownership.
should i be concerned ?

No concerns, don't get all oil hot and bothered, since the amount of time you spend at idle should be miniscule. I run 20/50 oil with high ZDDP zinc content. I'm in a hot semi-arid climate and rarely drive this thing in freezing temperatures.
I can't comment on the oil restrictors whether that has anything to do with it.

[Black_Hat]

using oil restrictors will slightly raise your oil pressure

[gorskined]

Originally Posted by Black_Hat

using oil restrictors will slightly raise your oil pressure

i was contemplating using them but its a double edged sword . did a bunch of reading regarding them. mixed opinions but its mostly from the natural asperated groups. I think i am going to start a new thread in this forum to see who what the norm is in the turbo engines .

[Black_Hat]

I'm using them on a 964 Turbo except I drilled them out to a size 1/2 way between restrictor and stock.
Many opinions on this. I defaulted to 1/2 way.
My oil pressure did drop a little.
I have a high lift cam and thought extra oil for lubrication/cooling wont hurt.

[gorskined]

Originally Posted by Black_Hat

I'm using them on a 964 Turbo except I drilled them out to a size 1/2 way between restrictor and stock.
Many opinions on this. I defaulted to 1/2 way.
My oil pressure did drop a little.
I have a high lift cam and thought extra oil for lubrication/cooling wont hurt.

good point, i was surprised how small the orifice is on the restrictor. i think that's the main reason i didn't use them.