351C Oil pressure

kevnsue · June 17th, 2008, 01:05 PM

I have a pinto with a 351C in it. It run's 80lbs of oil pressure at idle, but when you snap the throttle the oil pressure goes down instead of up. It seem's to be very unstable off of idle. any suggestions would be great. I have put new oil in and still has the same problem. I am running royal purple 5-30 Thanks Kevin.

russtang · June 17th, 2008, 03:31 PM

My brother had a Pinto with a 351c back in the 70's, raced it in Tx, cool car hot motor. Any oil leaks? probably not...how old is the oil pump? new...have you checked you spark plugs? have you done a compression test? have you done a vacuum check? Those are the things I would check, it could be a bad oil pump, piston rings, valve stem seals or as simple as an oil passage screw not being tight. It would be interesting to see what a vacuum test would show... Good luck with it

MustangOne · June 17th, 2008, 03:32 PM

You might have to look at your oil pick up and see it is blocked.

It sounds like it running out of oil.

460brevill · June 17th, 2008, 04:14 PM

if the pickup tube screen is tight to the oil pan it will do that.

kevnsue · June 17th, 2008, 08:46 PM

Thanks for the help. The motor is pretty new. it has around 30 1/8 mile passes on it. I am running a mechanical guage that is why it concerns me. Thanks again Kevin.

Kobra Killer · June 18th, 2008, 06:01 PM

Has it done this ever since the rebuild or did it just start?

I run 2 oil pressure gauges. Mechanical under the hood & electric inside so I can compare the two.

June 17th, 2008, 01:05 PM	#1
kevnsue Newbie Join Date: May 2007 Posts: 48 iTrader: 0 reviews	351C Oil pressure I have a pinto with a 351C in it. It run's 80lbs of oil pressure at idle, but when you snap the throttle the oil pressure goes down instead of up. It seem's to be very unstable off of idle. any suggestions would be great. I have put new oil in and still has the same problem. I am running royal purple 5-30 Thanks Kevin.

June 17th, 2008, 03:32 PM	#3
MustangOne Lost in the 60's 1968 GT 500 Super Snake 12.6 @ 114.3 Join Date: Mar 2008 Location: Sapulpa Oklahoma Posts: 2,053 iTrader: 0 reviews	You might have to look at your oil pick up and see it is blocked. It sounds like it running out of oil. __________________ MustangOne's Car's How to post Photos in Your Thread. Vote for your Favorite Ride of the month, Every Month Modded Mustangs Facebook

June 17th, 2008, 04:14 PM	#4
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	if the pickup tube screen is tight to the oil pan it will do that. __________________ i sixing 200 six with 300 hp.

June 18th, 2008, 06:01 PM	#6
Kobra Killer Regular Join Date: Sep 2006 Posts: 123 iTrader: 0 reviews	Has it done this ever since the rebuild or did it just start? I run 2 oil pressure gauges. Mechanical under the hood & electric inside so I can compare the two. __________________ Clevelands Rule https://home.comcast.net/~jimmiephil...er_project.htm

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June 17th, 2008, 03:31 PM	#2
russtang Look Ma! My First Post! Join Date: Apr 2008 Posts: 1 iTrader: 0 reviews	My brother had a Pinto with a 351c back in the 70's, raced it in Tx, cool car hot motor. Any oil leaks? probably not...how old is the oil pump? new...have you checked you spark plugs? have you done a compression test? have you done a vacuum check? Those are the things I would check, it could be a bad oil pump, piston rings, valve stem seals or as simple as an oil passage screw not being tight. It would be interesting to see what a vacuum test would show... Good luck with it

June 17th, 2008, 08:46 PM	#5
kevnsue Newbie Join Date: May 2007 Posts: 48 iTrader: 0 reviews	Thanks for the help. The motor is pretty new. it has around 30 1/8 mile passes on it. I am running a mechanical guage that is why it concerns me. Thanks again Kevin.

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