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Thread: Oil Pressure Spec

  1. 03-24-2015, 12:46 PM #1
    FL-Frank
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    Oil Pressure Spec

    I've searched but can't seem to find the answer to this question. What is the rule of thumb for calculating "healthy" oil pressure in a 2.4 T engine with MFI? I think I recall reading somewhere that it should be approximately 20 psi for every 1000 rpm. I recently had the leaking pressure sending unit replaced along with an oil change. The oil level is good, however the pressure gauge now reads 140 psi at 4,000 rpm with the new sending unit installed. Prior to installing the new sending unit, the gauge used to read approximately 80 psi at 4,000 rpm.

    Is 140 @4,000 too high? What would be causing this? What should it be reading?
    Cheers!

    Frank Kohnen
    Jupiter, FL USA
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    1972 Bahia Red 911 Coupe #9112100390..."Rudy" SOLD
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  2. 03-24-2015, 02:58 PM #2
    edmayo
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    10 psi for every 1,000 RPM at 190 degrees or thereabouts. Yes, 140 at 4000 is too high. Sounds like mismatched sender and gauge.,,,,,or you have a really stuck relief valve.
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  3. 03-24-2015, 03:32 PM #3
    Troos
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    How about a bad ground or loose ground wire? That could cause crazy high pressure reading.
    Tom
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  4. 03-25-2015, 10:52 AM #4
    FL-Frank
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    Quote Originally Posted by edmayo View Post
    10 psi for every 1,000 RPM at 190 degrees or thereabouts. Yes, 140 at 4000 is too high. Sounds like mismatched sender and gauge.,,,,,or you have a really stuck relief valve.
    Thanks Ed...
    Cheers!

    Frank Kohnen
    Jupiter, FL USA
    Registry Member #921
    1972 Bahia Red 911 Coupe #9112100390..."Rudy" SOLD
    1967 Savannah Beige VW Beetle Sedan #117364457..."Heidi"...aka "Tinker Toy"
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  5. 04-10-2015, 04:31 PM #5
    FL-Frank
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    correct sender installed, problem solved. Thanks again Ed!
    Cheers!

    Frank Kohnen
    Jupiter, FL USA
    Registry Member #921
    1972 Bahia Red 911 Coupe #9112100390..."Rudy" SOLD
    1967 Savannah Beige VW Beetle Sedan #117364457..."Heidi"...aka "Tinker Toy"
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  6. 04-11-2015, 03:44 AM #6
    mike911
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    Hello Frank, can you say what the issue was with the unit you installed?
    Regards,
    Mike

    Quote Originally Posted by FL-Frank View Post
    correct sender installed, problem solved. Thanks again Ed!
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