I have installed some aftermarket guages... my oil pressure is reading about 25 psi when driving and a little above 6 psi at idle when warmed up... I am running 10w30... this just seems low to me. I am wrong or is it about time for a new oil pump? this is in a '90 rrc with 168,000 on the ticker...
I don't want to re-start the whole "what oil is best" debate (many opinions there) but the Rotella 15-40 has been consistently the best for the engines I have built with a design like the Rover V8 and it improved the low rpm (hot) oil pressure dramatically. Example: I had a Ken Duttweiler built NHRA Stock Eliminator class Buick turbo V6 (same design/lineage as the rover v8) in my Buick Grand National and any other oil caused unacceptable rocker arm/lifter noise even though pressure/viscosity was within tolerances. I use it in my Rover too, others don't. To each their own, YMMV and my advice is worth exactly what you pay for it!
__________________
'95 RRC LWB, '05 Suburban Z71 (not stock), '94 F350 (very ugly), '62 International 404 tractor (red & white) & many other project cars in the past!
5 to 7 psi at idle when normal temp, 15 to 25 psi normal temp at 2700 to 3000 rpm max.
according to factory specs, that is for a normal? engine according to factory manual.
what is normal? I guess a good running, clean engine with out knock or tap issues.
I have installed some aftermarket guages... my oil pressure is reading about 25 psi when driving and a little above 6 psi at idle when warmed up... I am running 10w30... this just seems low to me. I am wrong or is it about time for a new oil pump? this is in a '90 rrc with 168,000 on the ticker...
Factory spec is up close to 40 PSI up around the 2,000 to 2500rpm. My 4.6 runs in the high 30's normally and may drop to the low 30's when the oil temp gets a little hot. At idle it reads in the low 20's and may drop to the high teens if the oil is getting hot.
At idle it should be around 20psi or above. The low oil pressure light cuts in at around 8PSI.
You definitely have an issue somewhere. Could simply be the oil you are using.
Do you have a functional oil temp guage. If so what is it reading when you have these low pressures.
Your low pressure is probably not doing your engine much good as it needs a certain amount of pressure to circulate and protect properly. I would not be driving it at those pressures unless I had another motor ready to go in.
I would not leave it the way it is. First I would try a thicker oil. Particularly a thicker hot temp oil, where you seem to be having you issue. I would not stuff around with a 40 weight oil as it is not going to prove much as to what is wrong. Go for something like a 15W50. If it fixes your issues you can try a 40 oil next time. If the 50 doesn't fix the problem, then you need to start looking at other causes.
5 to 7 psi at idle when normal temp, 15 to 25 psi normal temp at 2700 to 3000 rpm max.
according to factory specs, that is for a normal? engine according to factory manual.
what is normal? I guess a good running, clean engine with out knock or tap issues.
What motor are these the specs for. Can you supply the source of the specs?
factory certified technician, I have worked on cars and trucks for about 22 years, currently I am employed by a land rover dealrship. currently I hold ase master tech certificates on cars and trucks as well as heavy duty diesel engines level 1 and 2.
these specs can be found on the factory manual for all nas rover v8 buick based engines.
on land rover global reference and rave.
factory certified technician, I have worked on cars and trucks for about 22 years, currently I am employed by a land rover dealrship. currently I hold ase master tech certificates on cars and trucks as well as heavy duty diesel engines level 1 and 2.
these specs can be found on the factory manual for all nas rover v8 buick based engines.
on land rover global reference and rave.
There must be different manuals out there as every published landrover workshop manual has it at between 38psi and 40 psi (new motor) at between 2000 and 2500rpm. It varies slightly between the various years for the different models, that is why I posted the range. It would appear strange that, as the low oil pressure switch has an activation range of between 6psi and 10psi (8psi nominal), you are suggesting that having the low oil pressure light on at idle is "normal". But as a "factory certified technician" you must be right and I will not worry if the oil light ever comes on.
If you want to look up the specs in the old fashion way, here are the links to the hardcopy manuals. Both state that operating range is between 30psi and 40psi. That is, 40psi new motor, below 30psi stuffed motor.
My Rave CD(Discovery 4.0) says the oil pressure switch will initiate
From .22-Bar=3.19083-PSI
To .59-Bar=8.55722-PSI
So anything over 8.55722-PSI at idle would seem to be adequate.
Your after market gauge might not be calibrated correctly or your oil pressure switch is one of those switches that operated at the lower end of the scale. The .22-Bar=3.19083PSI before the Low Oil Pressure light comes on. weather this is good or bad Who knows.
oil pressure question...
this is in a '90 rrc with 168,000 on the ticker...
Linear Mode
