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Old 06-25-2007, 06:57 PM   #1
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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.
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Old 06-25-2007, 07:11 PM   #2
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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.
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Old 06-25-2007, 07:21 PM   #3
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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
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Old 06-25-2007, 07:22 PM   #4
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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.
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Old 06-25-2007, 07:24 PM   #5
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ah ok, thx for the help... if the pressure is low what would cause it? low on oil bad oil pump?
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Old 06-25-2007, 07:29 PM   #6
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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
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Old 06-25-2007, 07:31 PM   #7
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oil breacking down bad seals or bearings somewhere
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Old 06-25-2007, 08:03 PM   #8
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i know i need a new valve cover gasket, but i'll check like you said, thx for the help
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Old 06-25-2007, 08:05 PM   #9
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nah Valve cover gasket wont effect oil pressure more like cam, crank bearings and seals, or OP seals as well.
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