mazda/nissan

iTrader: (2)

What should a miata in decent running condition read on its oil pressure gauge? I thought i noticed mine running a bit low at around 15. I checked the manuals but it didn't say anything about it. Any help would be great since i finally have it back on the road.

magnamx-5

iTrader: (7)

factory guage sucks check with a mechanical to be certian i found that once hot my guage was off by 10-15 lbs of pressure to the low side. factory is 20-30 at idle and you should shoot for 10psi for every 1K rpm is what i have always heard to be good.

mazda/nissan

iTrader: (2)

well i think it was around 93-95 so the temperature may have had an effect, how would i check the oil pressure with a mechanical gauge? never had to do it

magnamx-5

iTrader: (7)

take out the stock sender and screw in the fitting and line for a mechanical gauge then run the motor and observe the pressure. A mechanical guage measures pressure directly with a oil filled tube that actuates a diaphram, and turns the needle on the gauge to its desired location.

mazda/nissan

iTrader: (2)

ah ok, thx for the help... if the pressure is low what would cause it? low on oil bad oil pump?

Joe Perez

iTrader: (8)

Typical readings cold:
Idle: 30
3000: 90

warm:
Idle: 15-20
3000: 50-60

Cold and warm refer to the temperature of the oil, not the ambient temp.

If you do decide to check with a mechanical gauge, remember that the threaded fitting in the block is 1/8" BSP, not 1/8" NPT. Correct adaptor: http://www.pegasusautoracing.com/pro...asp?RecId=3142

magnamx-5

iTrader: (7)

oil breacking down bad seals or bearings somewhere

mazda/nissan

iTrader: (2)

i know i need a new valve cover gasket, but i'll check like you said, thx for the help

magnamx-5

iTrader: (7)

nah Valve cover gasket wont effect oil pressure more like cam, crank bearings and seals, or OP seals as well.