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Join Date: Feb 1999
Location: Chelsea , Quebec , Canada
Posts: 113
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Oil Pressure/Cam Restrictors
Oil pressure on freshly built 2.4 with all oil system upgrades including Cam oil restrictors is over 115 psi @ 5000 , 25 psi at idle 65 C oil temp. Cold oil temps (20C) are higher 38 psi at idle for example.
Pressure is correct measured with calibrated mech. gauge, both relief pistons verifed and not sticking. I am now thinking of pulling the cam oil restrictors as I feel the pressures are excessive. Any comments ? Thanks Chris Last edited by ChrisN; 03-22-2005 at 07:29 PM.. |
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03-22-2005, 07:01 PM
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Join Date: May 2003
Posts: 3,346
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I took mine out for the same reasons.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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03-23-2005, 11:33 AM
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Join Date: May 2003
Posts: 132
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How about just drilling out the restrictors to make them a little larger. My 930 runs over 5 bars @ 5000 rpms, but right at 2 bars at idle with the updated restrictors.
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Victor Toce 2000 Boxster S w/ Tequipment exhaust 1993 Spec Miata 87 911 turbo - sold 3.4 RUF pistons and cylinders Euro CIS head |
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03-23-2005, 01:07 PM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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"Oil pressure on freshly built 2.4 with all oil system upgrades including Cam oil restrictors is over 115 psi @ 5000 , 25 psi at idle 65 C oil temp. Cold oil temps (20C) are higher 38 psi at idle for example.
Pressure is correct measured with calibrated mech. gauge, both relief pistons verifed and not sticking." Your idle pressures seem okay, but your normally operating pressures are high. If you made that observation, why do you say the "pressure is correct...."? Do you think the previous factory camshaft oil restrictors (larger orifice) will reduce the oil pressure by 50 psi or so? I think you should look at the pressure relief system for a solution. MHO, Sherwood |
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03-23-2005, 05:46 PM
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Join Date: Feb 1999
Location: Chelsea , Quebec , Canada
Posts: 113
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My statement "pressure correct" refers to the fact that the pressures indicated on the gauge are correct and that the gauge has been calibrated. By calibrating the gauge and verifying that what it reads is correct I can then be sure it is actually reflecting oil pressure and not a sender problem, ground problem etc.
With respect to the relief system, bypass mod done, new relief springs and pistons added. Pistons were removed to check for binding and smooth travel in the bores with no problems found. Relief spring for the horz. oil pressure relief requires slightly more pressure to compress then the old spring removed but this is a new spring vs an old spring. Chris Last edited by ChrisN; 03-24-2005 at 03:29 AM.. |
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03-24-2005, 03:23 AM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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"Relief spring for the horz. oil pressure relief requires slightly more pressure to compress then the old spring removed but this is a new spring vs an old spring."
Pressure gauge calibration understood. Thanks. If the new spring exhibits more tension than the old spring, that implies a higher relief pressure threshold. Perhaps substitute the old spring and see what happens. Sherwood |
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03-24-2005, 09:31 AM
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