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Author
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Topic: Low oil pressure???
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Rigo5.0
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Member # 5247
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posted
 
 
I finally put my 331 into the stang, but I have a problem. The oil pressure when the car is cold is around 60 psi and after it warms up it drops to 5 psi. I bought the motor used off a friend and it only has about 3,000 miles since built. I'm thinking a bad oil pump, but what else should I be looking at?
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91 5.0 [331|T56]
87 Grand National
02 Z06
08 Challenger SRT8
13 Shelby GT500
00 Lightning
14 Camaro SS
Posts: 1454 | From: Kansas City | Registered: Jan 2005
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kingmoochr
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Member # 5834
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posted
what weight oil and who built it. does the pressure increase with rpms? whats peak pressure when hot
Posts: 880 | Registered: Jul 2005
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Rigo5.0
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Member # 5247
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posted
10w30, and as the rpms go up the oil pressure does as well, @ idle when hot its @ 5 psi
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91 5.0 [331|T56]
87 Grand National
02 Z06
08 Challenger SRT8
13 Shelby GT500
00 Lightning
14 Camaro SS
Posts: 1454 | From: Kansas City | Registered: Jan 2005
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2stangs69-91
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Member # 1951
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posted
Doubt it is a bad oil pump. Do you have a mechanical test gauge to verify your readings? Throw some 20-50 wt in it.
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69 Mustang on hold
1991 LX hatch getting a make over
1994 F150 4X4 351
2006 Yamaha V-max 1200 Modded
Posts: 3711 | From: Redding | Registered: Oct 2002
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kingmoochr
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Member # 5834
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posted
you need 10 psi per 1000 rpm. change for 20-50 and report back. could be tolerances that are too lose or another reason (bad oil galley plug, etc) you are bleeding pressure
Posts: 880 | Registered: Jul 2005
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Jaejae5.0
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Member # 7958
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posted
HAVING A BIG HOLE IN YOUR OIL COOLER WOULD MAKE YOUR PESSURE LOW..
[ December 30, 2007, 01:13 AM: Message edited by: jaejae ]
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1987 notchback h/c/i 302 & 70mm turbo SOLD
2000 camaro ss cam only
Posts: 4890 | From: the combustion chamber | Registered: Oct 2007
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jmcclesk
Moderator
Member # 1355
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posted
How does a large oil cooler cause low oil pressure????? please explain.
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Ford trained ASE master tech.
Posts: 4024 | From: marrysville | Registered: May 2002
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