low oil pressure

1SILLYGT · 02-24-2004, 10:07 AM

Someone please help, I recently swapped a 351w into my 90GT and I spun a bearing. I pulled the crank had it cut with matched bearings and I also added speed-pro pistons and eagle rods. now when I start the car up i have about 10 lbs of pressure at idle. Does anyone have any suggestions for me. Please

Smokedawg · 02-25-2004, 11:30 AM

Check the oil for other liquids(water, antifreeze, gas)..These will lower the pressure. Also, how do you know you only have 10lbs? Is that what the stock guage says? Take off the oil sending unit and hook up a aftermarket guage to that fitting and test it.

-Smoke

jonnyk · 02-25-2004, 12:01 PM

What pump do you have in there?

1SILLYGT · 02-25-2004, 03:36 PM

there are no other fluids mixed in the oil, and i know the oil pressure because i have an autometer mechanical oil pressure gauge

LX5liter · 02-25-2004, 05:26 PM

When the rotating assembly was put back in the block were all the clearances checked with plasti-gage? What about the cam bearings, were they replaced? Was the pressure higher before with the same pump in the old engine or is this a new pump? The good news is it will still live with 10psi oil pressure as long as the pressure increases as the engine revs, ( I believe the # is 6psi/1000rpm but I may be mistaken. )

02-24-2004, 10:07 AM	#1
1SILLYGT Registered Member Join Date: May 1999 Location: sloatsburg NY Posts: 28	low oil pressure Someone please help, I recently swapped a 351w into my 90GT and I spun a bearing. I pulled the crank had it cut with matched bearings and I also added speed-pro pistons and eagle rods. now when I start the car up i have about 10 lbs of pressure at idle. Does anyone have any suggestions for me. Please __________________ 90 GT 351W long-tube headers, flowmaster exhaust, off-road h-pipe, 3.73 gears, hurst short throw shifter, GT-40 heads, demon 650 carb, speedpro pistons, eagle rods, comp cams

02-25-2004, 11:30 AM	#2
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	Check the oil for other liquids(water, antifreeze, gas)..These will lower the pressure. Also, how do you know you only have 10lbs? Is that what the stock guage says? Take off the oil sending unit and hook up a aftermarket guage to that fitting and test it. -Smoke __________________ 1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc

02-25-2004, 12:01 PM	#3
jonnyk Being stroked is great Join Date: Oct 1998 Location: Alberta, Canada Posts: 772	What pump do you have in there? __________________ Novi 2000 now spinning off the snout of the 331... Mods Pics

02-25-2004, 03:36 PM	#4
1SILLYGT Registered Member Join Date: May 1999 Location: sloatsburg NY Posts: 28	there are no other fluids mixed in the oil, and i know the oil pressure because i have an autometer mechanical oil pressure gauge __________________ 90 GT 351W long-tube headers, flowmaster exhaust, off-road h-pipe, 3.73 gears, hurst short throw shifter, GT-40 heads, demon 650 carb, speedpro pistons, eagle rods, comp cams

02-25-2004, 05:26 PM	#5
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	When the rotating assembly was put back in the block were all the clearances checked with plasti-gage? What about the cam bearings, were they replaced? Was the pressure higher before with the same pump in the old engine or is this a new pump? The good news is it will still live with 10psi oil pressure as long as the pressure increases as the engine revs, ( I believe the # is 6psi/1000rpm but I may be mistaken. ) __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

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