Full Flow Oil System Pressure?

salvatoremarino64 · Posted: Mon Sep 23, 2013 6:12 am Post subject: Full Flow Oil System Pressure?

I have a full flow system on a 1835. Prior to that I had 45 to 50 psi. Now i have 25 psi cold to warm and about 15 hot.

Why the major drop in pressure??

OLD VW NUT · Posted: Mon Sep 23, 2013 8:36 am Post subject:

Prior to what? If you did nothing more than add full flow filtering to an existing motor there will be some drop in oil pressure - it takes work to push oil thru the lines and filter then into the motor. Sounds like you should have added a larger oil pump while the motor was out and on the ground. A stock 21mm pump is barely adequate to push oil through a filter and lines added on for full flow oiling.
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salvatoremarino64 · Posted: Mon Sep 23, 2013 9:22 am Post subject:

Prior to installing the full flow.

It does have a larger pump but im not sure what size. I go know that the pump housing is much thicker than stock.

ashman40 · Posted: Mon Sep 23, 2013 9:44 am Post subject:

The easiest thing to check is the pressure relief valve next to the pump. Use a large screwdriver to remove. Make sure it can move freely all the way in until it seats. If it is stuck part way open, you will loose oil pressure.
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salvatoremarino64 · Posted: Mon Sep 23, 2013 10:35 am Post subject:

I am using a Bugpack Oil return adapter that goes in where the pressure relief valve was.

Should I leave it all in?

ashman40 · Posted: Mon Sep 23, 2013 11:11 pm Post subject:

Did you full flow the case? What I mean is, did you install a galley plug in the case where the output of the oil pump would normally flow oil into the case? This is to prevent oil from flowing from the return fitting back to the pump outlet. Without a plug here it is possible for oil to leak between the case and pump and drain back to the sump. Some will tell you this is not necessary as long as the fitment of the pump to case is snug. This is true.

I've not used the adapter you're referring to. I do understand it replaces the first pressure relief valve. I suppose if the upper orifice that the long tube fits through is not a snug fit to the tube oil will leak past and drain back to the sump. This would lower your oil pressure. You will need to find someone who has run one of these to see if they noticed the same thing as you. Maybe it is normal to see slightly lost pressures when using this adapter?
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salvatoremarino64 · Posted: Tue Sep 24, 2013 6:16 am Post subject:

Yes.... I think. I pulled the pump out, put a plug in opposite the oil pick up into the pump. The pump was real tight to get in and out but it was not horrible.

You say it replaces the first pressure valve?? [u]

I did not install any valves or springs when I screwed the adapter in.
Should I have put something back in?

ashman40 · Posted: Tue Sep 24, 2013 6:50 am Post subject:

salvatoremarino64 · Posted: Tue Sep 24, 2013 8:16 am Post subject:

Yes... When I pulled the pump out it was already tapped so I just put a plug in it as shown.

Oil pressure valve #1 had The screw on cap, 1 long spring, a valve, a smaller spring, and another valve.

Oil pressure relief valve # 2 is there but I did nothing with it.

I guess my next step is to unscrew #2 and see whats inside. What would you recommend putting in there?? I have no problem buying a new valve assembly, I just need to know what to look for in springs and valves. Or better yet what manufacturer?

BTW.... I appreciate all you help on this.

salvatoremarino64 · Posted: Tue Sep 24, 2013 5:03 pm Post subject:

Well... I went to remove the cover on the other relief valve and I had no luck removing it.

I did talk to someone about the front one and it should only be 1 spring and 1 valve in each.

Stumped on removing it. Don't wanna take it in but my have no choice.

OLD VW NUT · Posted: Tue Sep 24, 2013 5:11 pm Post subject:

Here's a pic of the standard way of installing full flow oiling.

Is your's different?

Image may have been reduced in size. Click image to view fullscreen.

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Other car - 2013 VW Golf TDI

johnnypan · Posted: Tue Sep 24, 2013 5:29 pm Post subject:

Multi69s · Posted: Tue Sep 24, 2013 10:27 pm Post subject:

Lets take a step back, before checking relief valves and other things. The first thing that I would check is the gasket between the oil pump and its cover. There are two almost identical gasket that are used when installing an oil pump. One between the case and the pump body, and the one between the pump body and the cover. If you mix up these two gaskets, you will not have good oil pressure. The critical gasket is the one between the pump body and the cover. This gasket is so thin, that if you blew your nose with it, it would tear. If you put the thick gasket there instead, the oil will actually bleed off from the pump, and your oil pressure will be VERY low. I would check that first.
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salvatoremarino64 · Posted: Wed Sep 25, 2013 5:55 am Post subject:

Mr. Nut........ For the most part its the same. If you look at prior post, Ashman posted a pic of the return.

salvatoremarino64 · Posted: Wed Sep 25, 2013 5:58 am Post subject:

Multi69's..... Hard to mix the two of them up when only one fits over the pump snout between block and pump.

Thanks for your input. All is appreciated.

ashman40 · Posted: Wed Sep 25, 2013 8:35 am Post subject:

salvatoremarino64 · Posted: Wed Sep 25, 2013 9:41 am Post subject:

I don't have a pic at the moment but I can post one of what came out ov pressure valve 1.

Im looking into a large 1/2" impact screwdriver bit. If I can not find one... I have stuff to make one.

BTW.... Thanks for all your help!!

salvatoremarino64 · Posted: Thu Sep 26, 2013 5:11 am Post subject:

WOO HOO!!!! Great news!!

I was able to remove the spring and valve from the (flywheel) side. The spring was soft and short.

New spring from Empi is much longer and stiffer.

@ Idle 30 psi
@3000 rpm 50 psi
@4500 rpm on up 70 psi.

I would like to thank all of you for your advice. This inspires me to wanna build a larger engine.

salvatoremarino64 · Posted: Thu Sep 26, 2013 6:09 am Post subject:

Maybe I spoke too soon.... Sad

Drove it into work this morning. Oil pressure started out great. I know its cold and oil is thick. As it warmed up, pressure dropped slowly. By the time I got to work ( about a 20 min. drive) pressure was @ 25 on freeway and about 5-10 at Idle.


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