C-1 Oil pressure gauge

[Richard G.]

I kept my old oil pressre guage line but installed a reproduction line. Don't know why -I just did. Anyway, the diameter of the repo line is bigger than the original inside and out. Is this why the oil pressure is pegged until the car is warm and idling? Rebuilt original 270 hp engine just now past 500 miles. Guages worked fine when I parked it years ago. Don't know if I can bend the old line back into shape or not or if that will change anything. Thanks for any comments.

[Stephen B.]

Re: C-1 Oil pressure gauge

i do not believe the line has anything to do with that it is probably tighter bearings since the rebuild and will lower over time and wear or may be the wrong pump just my two cents Steve

[Roy B.]

Re: C-1 Oil pressure gauge

I kept my old oil pressre guage line but installed a reproduction line. Don't know why -I just did. Anyway, the diameter of the repo line is bigger than the original inside and out. Is this why the oil pressure is pegged until the car is warm and idling? Rebuilt original 270 hp engine just now past 500 miles. Guages worked fine when I parked it years ago. Don't know if I can bend the old line back into shape or not or if that will change anything. Thanks for any comments.

Well a water line nozzle (diameter ) will change water pressure

[Stephen B.]

Re: C-1 Oil pressure gauge

if I am not mistaken it changes volume not pressure Steve

[Roy B.]

Re: C-1 Oil pressure gauge

My thinking may be off but if you open a water nozzle you get more volume of water and if you close the nozzle hole you get more pressure ??

[Stephen B.]

Re: C-1 Oil pressure gauge

may still be barking up the wrong tree but does this say it or not Pressure is a one-way street. It can always be reduced, but it cannot be increased unless there is sufficient volume to sustain it, and the volume is strictly a factor of pipe capacity.
Steve

[Ken A.]

Re: C-1 Oil pressure gauge

Line size does NOT affect pressure, just volume. You might want to use another gauge to check your calibration. Your original gauge can be tested & calibrated.

[John H.]

Re: C-1 Oil pressure gauge

Rebuilt original 270 hp engine just now past 500 miles.

Oil pressure will always be higher with a fresh rebuild than it was on the old engine, due to tighter bearing clearances, even with a stock oil pump. Diameter of the oil pressure line has no bearing on indicated pressure.

[Bob B.]

Re: C-1 Oil pressure gauge

Richard,

Hope you reproduced the loop in your oil line when you replaced it. The thickness of the oil line makes no difference as to pressure because there is no flow, same as with your brake lines.

You didn't say what the pressure goes down to after the car warms up, but it should be mid-range of your gauge. If it is higher, whoever rebuilt the oil pump may have put a higher pressure/volume pump in. Too much pressure might damage your gauge or so I have been told. Also, you won't pass PV if your oil pressure is too high if you go that route.

Bob

[Ken A.]

Re: C-1 Oil pressure gauge

Richard,

. Too much pressure might damage your gauge or so I have been told. Also, you won't pass PV if your oil pressure is too high if you go that route.

Bob

Urban legend. Gauge should be able to handle 100 psi & c-2 up were built for 125 psi factor

[William C.]

Re: C-1 Oil pressure gauge

"Engine rebuild" was a standard pump installed or a "high volume" pump? Many have also a high pressure spring which will peg the gauge on a C-1. Maybe a drop the pan is in order. LOTS on this in the archives.

[David K.]

Re: C-1 Oil pressure gauge

I have exactly the same issue with my '62. As of today, I have finally drove it. When cold, I will peg the guage, when it gets hot/warm, it will drop to around 50lbs. I have the same repo oil line you do. I did have my guages restored and the engine is the original one..rebuilt. I now have 36 mi. on the engine.

[Richard G.]

Re: C-1 Oil pressure gauge

From input I have gleaned the following:
1. The line diameter is not a factor. 2. The oil guage should be able to handle being pegged. 3. It is possible the pressure may get to "normal" as the bearings and clearances wear in. 4. If the high presure reading bothers me or does not go down I need to drop the pan and check the oil pump ( I guess the numbers on the pump will indicate if it is "stock" or a high volume pump) Thank all of you for your input. I'm thinking this is a situation that can wait for a while. Won't it be nice if a situation that looks like a problem fixed itself. Wouldn't happen often on a C1. Thanks, Richard