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CC Advertisers
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08-08-2008, 06:41 AM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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Not Ranked
I lost about 8 psi of oil pressure when I added an oil cooler to my road racer, small block Ford engine... I have used 4 different oil coolers over the years (headered type and single pass type) and get about the same results with all four... also using 12 AN lines... Talking to others about this, I think a 5 to 10 psi loss with an external oil cooler seems about the norm...........
David
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DAVID GAGNARD
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08-08-2008, 06:52 AM
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CC Member
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Join Date: Sep 2003
Location: Melbourne, Aust,
vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
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Not Ranked
David,
What pressure did you drop to, and what is a normal oil pressure with oil cooler ????? |
08-08-2008, 07:08 AM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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Not Ranked
I have a Melling HP series oil pump that is adustable for pressure... Normally I run about 50 to 55 psi on track at speed once the oil is at temp (220 to 240 degrees)....idle oil pressure is 30 to 35 psi at temp...
I really like this oil pump, it is a blue printed pump from Melling is under 50 bucks.... it is stock pressure and stock volume (I don't care for high volume pumps), but where the spring is, instead of a plug in the hole, it has a large Allen head screw, screwing it in or out will adjust the pressure......
Start-up, cold oil, it goes to 60 to 65 psi, as the oil warms up, pressure drops....I'm runnig Mobil I 15/50...... I have tried other oils and get within 5 psi regardles of what type/weight oil I use....
Motor is a 331 cu in stoker, 12.75 to 1 compression, turning from 3000 to 7000 rpms on track......
For a street car/motor, I would think anything over 40 psi at speed would be fine, and 25 to 30 psi at idle.....
David
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DAVID GAGNARD
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08-08-2008, 07:08 AM
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CC Member
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Join Date: Jul 2008
Location: Knob Hill, Monterey,
CA
Cobra Make, Engine: 931 mangled in parkinglot incident - traded for new house roof <sob>
Posts: 113
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Not Ranked
I also dropped 9 psi hooking up the cooler. This was with the oil cold. Once it warmed up and the oil thinned the oil pressure actually went up and almost matched hot oil pressure with no cooler  Don't worry about it and don't beat on it until it's fully warmed up.
Long Live the Cobra!!
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"...Just Shut the phuque up and Move on please..."
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08-09-2008, 06:06 PM
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CC Member
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Join Date: Sep 2003
Location: Melbourne, Aust,
vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
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Not Ranked
Thanks
Thanks guys, took it out for a spin yesterday in the Melbourne sun. 
Runs at 45 lb with engine warm. Will leave the cooler on and test at the Nationals in October.
Thanks for your help.
Snaken |
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