Oil pressure guage is reading a little higher than normal on an 85 12a - at idle its around 70lb and when at speed its about 100lb. - what would be causing this? - and how much oil pressure is too much?

 

http://www.racingbeat.com/FRmazda1.htm

This lists oil pressures...

 

I have the same question. My oil perssure runs over 100psi at speed. Is this too much or about right?

 

toxic the link doesnt work.
are you guys running the proper oil?
ive heard of the 2nd gen guys running up to 90 psi but i havent heard of any running over 100.
double check with a mechanical gauge factory is suppsoed to be 30 @idle and 60 above 1500rpm

 

The normal oil pressure in a stock Mazda rotary is approximately 71 psi above 3,000 RPM, (110 psi above 3,000 RPM in the 1993-95 RX-7) and should never drop below 15 psi at idle (use a 0 to 125 psi gauge). Normal oil temperature varies quite a bit depending on the operating conditions, but usually stabilizes between 140F and 200F. If the temperature exceeds 210F, reduce the load on the engine immediately or shut it off. Continued operation above 210F may damage the engine.

copied fromt he racingbeat page

 

Assuming the dash guage is somewhat accurate, will I hurt anything if its at approx. 100psi at highway speed? Its less at idle. I will check it at various speeds tonight since I drove it to work and post the resuts tomorrow

 

about 70psi at 1K rpm idle
jumps to approx. 90psi at 2K rpm
then 100 to 100+ psi at 55mpg
guage was reading lower until yesterday [maybe 60 to 70 range] - what would cause this jump in oil pressure reading and is there a risk of damaging something internal or external to the engine, e.g. blowing a oil line?

 

wow you guys! hahahah unless your motor is highly ported and you are always in excess of 8k rpms you dont need that high of oil pressure. the most needed for a street car is the the racing beat 85psi regulator. 85.... not over 100. lol i would check that out, it might be your gauge is off. i dont see HOW you guys are getting that high unless something is messed up.

 

my fc is 30 at idle, and never goes about 60. Stock internals with just bolt-ons.

 

try replacing your oil sending unit

 

the more horsepower the more oil pressure you want the motor may ahve the wrong oil regulator.just a guess

 

I had my oil pressure bumped to 100psi when Mazdatrix built my TII engine.It fluctuates a bit depending on temp,anywhere from 80 to 110psi.Anything higher than that and the oilpump chain can wear prematurely from the load.

 

Nah, the oil pump will outlast the motor. Have you ever heard of an oil pump going bad? I have not.

I have been using high ROPR (100 PSI for over 10 years, and lately the FD ROPR) with no problem. In fact, Im still using the same ROPR and GSL-SE oil pump in my RX-3's motor which is the same block that I rebuilt @ appx 130K miles. Now I have over 50K of daily abuse (was my daily driver) and still runs hard, not to mention I never warm up my engine after work. The block Im talking about has been around for 16 years. GSL-SE internals with modified e-shaft for better oil flow and OMP set high are contributors for a long lasting engine IMHO.

High pressure ROPR is useless if the oil cant run freely.

 

Chances are its one of the following (listed in order of likelihood)

a) stock gauge is crap (very common on mazdas)
b) stock gauge is crap (once again a very common problem with mazda)
c) Read the first explanations
d) somebody changed the ROPR and put in a HD Pump
e) your a freaking ****, and you put gear oil in the engine

seriously the gauges that mazda used were not known for thier accuracy, look at the Temp guage for petes sake, it read half way from engine warmup until its too late, the speedo's tend to be off by as much as 10% from the factory, and the tach well go figure.

kenn

 

i've got a buddie with a PP the idels at 120 psi >

 

So if the stock oil pressure guage is not bad (it was reading more like you would expect it to read until a week ago), then 100psi will not cause any serious harm to anything if I run it several 100 miles until I find out what is really causing the high reading? At idle it drops to appox. 70psi.

Ths is a bone stock 85 12a with 60k originial miles on it using 10/30 Exxon Oil (always have used 10/30 oil in it)

 

The gauge can't be right.

 

YOU CAN NEVER HAVE TO MUCH OIL PRESSURE! Remember.... your bearings are riding on that THIN layer of oil... so long as your not generating leaks...I would not worry about it. Good Luck! I am running between 100-120PSI in my racecar...which is basically stock with some MINOR porting... Its an IT7 car.

 

Okay so it may not be bad to run that much oil pressure as long as your not generating leaks BUT whatever's causing the increase in pressure might hurt your engine in the long run.

Example: Clogged FRAM oil filter + not finding and replacing the problem = engine Failure

 

FYI - the fix was a replacement Oil Sending Unit - so if you are getting a high reading, try replacing it as a second step - first step being making sure connection is tight and connection is clean - also confirmed at dealer that oil filter will sometimes cause a high oil pressure reading, so worth replacing the filter before oil sending unit

 

30 psi at idle
60+ psi at hwyspeeds
12a with beehive

 

Wack the end of ROPR with using a sledge hammer. the idea is to compress the spring but not too much.


Modded wrench (grinded down) for this project. for illustration only.





Left is stock. Right is over 100 psi.



[this will give ya about 30 psi at idle and 80 psi max .


I had to replace the FD ROPR in my FB since blow-thru turbo is on-hold.