Oil pressure question

[Doughboy66]

While rebuilding my 1970 dual relief 1600 I had the case full flowed and I am running a remote oil filter. I am running a larger oil pump but do not remember the exact size and I am running a manual oil pressure gauge. The problem is when I stop the oil pressure goes down to 0 for a few seconds this happens with both the stock and high pressure springs. Is this normal? should I be concerned?

 

[DeathBySnuSnu]

Zero is not normal.

10 psi per 1000 rpm is normal.

So an 800 rpm idle should be 8 psi.

 

[stinger608]

When you ran the tubing for the oil pressure gauge, did you make sure and bleed all the air out of the line?

An air bubble may be causing that issue.

Just pull the oil line, and your coil wire (so the engine doesn't start), then crank the engine over for a minute or two until you have solid oil coming out of the line.

If that isn't the problem, then you have a serious internal oiling issue.

 

[LarryA]

reply

do you mean that oil pressure drops to 0 at a stop lite, but then recovers??? or mean it stays down to 0.....if it recovers to normal after a short interval, i would suspect a relief valve hanging up, then finally closing, and pressure returning to normal.... my 02 larry

 

[rhino 2]

While rebuilding my 1970 dual relief 1600 I had the case full flowed and I am running a remote oil filter. I am running a larger oil pump but do not remember the exact size and I am running a manual oil pressure gauge. The problem is when I stop the oil pressure goes down to 0 for a few seconds this happens with both the stock and high pressure springs. Is this normal? should I be concerned?

Any chance the problem is the remote oil filter...Holding back the oil flow till the pump can over ride it...VW Air cooled were never made with a oil filter , Or needed one...:Shrug:

[Except for the wet air filter]

 

[DeathBySnuSnu]

Well that gives another thought.

Not all filters are built the same.

They all have a filter element.

But some depending on application have a flow check valve so they don't drain back when shut down.

Others have a pressure differential valve that bypasses the element if the filter is clogged or oil to cold and thick to pass through.

All that being said.....it is possible to have the oil lines backwards on the in/out and cause all kinds of oil pressure problems.

And personally I would recommend an oil filter over any other possible engine modifications.