When the car first starts up it has normal oil pressure.When it warms up(after about 5-10 min) the gauge drops to zero.But when you give it any amount of gas/throttle the oil pressure jumps right back up.A new oil pump was installed but it still seems to do it.The motor doesnt make any lifter noises or knocks.

Any ideas as to what it could be?

The mods to the car are: Jet Performance Chip,2 Chamber Flowmasters,March Underdrive Pulleys.

Thanks in advance.

Erik

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1966 Ford Mustang 2+2
Mine - Restomod in Progress

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

Continually learning so I'm trying to picture which part of the engine has wore out.

Thanks in advance.

Erik

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1966 Ford Mustang 2+2
Mine - Restomod in Progress

It may be possible to fix this without a rebuild. It all depends on the condition of the crankshaft journals. You need to remove the oil pan, and remove and inspect each bearing and journal. If each respective journal still looks good, {no bad scoring or rough surfacing} you can try replacing the bearing {look at the back side of each bearing to read what undersize it is} and see what you end up with for oil clearance using Plastigauge, which is a type of clay string you lay across the engine bearing, reinstall and torque the bearing cap, then take it apart again to compare the width of the crushed Plastigauge to a scale and determine oil clearance.

{This was a common job for me at the Buick dealership, as the guys that grind crankshafts in Flint seemed to smoke lots of reefer. }

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

On the brighter side, the wife has let me go ahead and purchase a new engine in lieu of rebuilding the old one with limitations.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Alex, the problem is on a "prospective" fox body car that I was eyeing.

Thanks in advance. Again.

Erik

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1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

quote:

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Originally posted by Moneymaker:
Are you using the original factory gauge for testing? If so, I would try a mechanical gauge test before you condemn the motor.

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Think of the oil clearance as a controlled leak. When the clearance gets too large, the pressure drops. In fact, one of the things I used to do to quickly find a bad bearing is I used to pressurize the oil system and gm actually had a drop-per-second spec that would help you pinpoint the bad bearing. You usually didn't even have to count, the bad one would usually squirt. All you did was hook an air line at the oil sender port and hit it with 20-30 psi. That would also point out the cam bearings if they were bad.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl