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Goshen
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Joined: April 03, 2012
Posts: 833
Location: Miami. FL & Cartagena
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 Posted: Mon Jul 07, 2014 8:25 am Post subject: Should my Oil pressure gauge read 80 psi at Idle ? |
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I have a question
My car at Idle at the stop light reads between 80 to 100
at 40 MPH it reads 40 to 60
It is a VDO gauge with a sending unit.
My motor is a 1641cc with Engle 110 cam
I installed Scat HD Dual Oil Relief springs
I also have a full flow oil pump with remote oil filter under the rear fender
Here is a pic at Idle.. traffic light
Here is a pic at 40 MPH driving it reads 50 to 60psi
Here is the HD full flow oil pump
You can see the oil pressure sending unit
Hydraulic Lines used for the oil lines
Remote Oil filter
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esde
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Joined: October 20, 2007
Posts: 5969
Location: central rust belt
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| Posted: Mon Jul 07, 2014 8:31 am Post subject: |
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| Lose the scat springs, the fram filter, and the blue distributor cap. The springs are part of the cause, if not all of it. The filter is not going to last long at that pressure, and Fram is not a good filter these days. The blue cap is just garbage too, and will leave you stranded... |
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[email protected]
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Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
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| Posted: Mon Jul 07, 2014 9:03 am Post subject: |
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What oil are you using with that huge pump?
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Goshen
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Joined: April 03, 2012
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Location: Miami. FL & Cartagena
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Goshen
Samba Member
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Location: Miami. FL & Cartagena
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[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
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| Posted: Mon Jul 07, 2014 9:31 am Post subject: |
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Change to 0-30 or 5-30 and your pressures will behave a lot better.
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vwracerdave
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Joined: November 11, 2004
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Location: Deep in the 405
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| Posted: Mon Jul 07, 2014 9:33 am Post subject: |
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A few years ago the Fed Gov't changed the specs for all diesel engines and the Diesel motor oil should no longer be used in any gasoline engine. You need to change it.
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jfats808
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Joined: December 10, 2007
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Location: oahu hawaii
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| Posted: Mon Jul 07, 2014 9:49 am Post subject: |
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Thats one of those 30mm in/out oil pumps. X2 on the oil change to 10-30 and either find softer springs and/or swap the "champagne glass" relief galley plug with a stock one. I think youll def need to do both.
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Check your oil levels routinely! |
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Juanito84
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Joined: March 17, 2012
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Location: Colorado Mountains
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| Posted: Mon Jul 07, 2014 10:09 am Post subject: |
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Is it just me or doesn't it seem strange the oil pressure goes down with increasing RPM? Wouldn't that possibly be a faulty reading, perhaps a gauge that is wired incorrectly?
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If a water cooled engine cools its water with air, isn't it just an overcomplicated air cooled engine? |
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esde
Samba Member
Joined: October 20, 2007
Posts: 5969
Location: central rust belt
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| Posted: Mon Jul 07, 2014 10:48 am Post subject: |
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| Juanito84 wrote: |
| Is it just me or doesn't it seem strange the oil pressure goes down with increasing RPM? Wouldn't that possibly be a faulty reading, perhaps a gauge that is wired incorrectly? |
I saw the same readings too, using the HD springs; high at idle and lower at 2-3k. The idle pressure is high, and I suspect the forward relief valve is closed. As RPM increases so does pressure, the valve opens and pressure drops. On my engine I figured that the volume of oil flowing past the relief valve at that point was enough to hold it open until the engine was brought back to idle. At least that's what we thought, putting a stock spring solved the issue. 25 years ago and I had bought a 30mm pump, HD springs, the adjustable relief plug,and then was stumped when it blew coolers and filters on a weekly basis. Took an old German mechanic to set me straight, I was so mad to be removing $30 worth of new parts to make the thing run right, but that was the solution |
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Juanito84
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Joined: March 17, 2012
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Location: Colorado Mountains
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| Posted: Mon Jul 07, 2014 11:02 am Post subject: |
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Ok, that makes sense.
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If a water cooled engine cools its water with air, isn't it just an overcomplicated air cooled engine? |
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Quokka42
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Joined: December 02, 2010
Posts: 3117
Location: Melbourne, Australia
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| Posted: Mon Jul 07, 2014 2:19 pm Post subject: |
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While it is known the scat springs are too strong, 30mm is larger than most need, and diesel oil is not well suited to our engines, I too suspect there is a problem with the sender. 80-100 at idle would seem suspiciously high even with cold 50 weight!
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57 Rag
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Location: Paradise
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| Posted: Mon Jul 07, 2014 2:37 pm Post subject: |
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My question is.... how long has the motor been running when it reads 80-100? Does it stay like that through out the drive?? Im running 20-50 and when i first start it she will have about 75 psi and it slowly comes down as the engine warms up. Before you know it, whats its warmed up its down to 20-25ish.
If your running 80-100 after shes warmed up, simply switching to 10-30 aint gonna help much. But like Dave said switch it. For me... just the fact that its "Diesel oil"...nuff said. Definitely go with the stock spring first and see what happens. I still dont know how you didnt already blow filter on that Fram POS. Ive used those just on breakins here and there and let me tell you, aside from the chance of screwing up your motor, theres nothing worse than throwin oil all over your engine bay and garage!!!  Good luck and keep us posted.
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miniman82
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Joined: March 22, 2005
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Location: Southern Maryland
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| Posted: Mon Jul 07, 2014 2:38 pm Post subject: |
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| little mouse wrote: |
| 80-100 at idle would seem suspiciously high even with cold 50 weight! |
Really? What does your crystal ball, *cough* I mean science book have to say on the subject? 30mm pump+15-40 oil+HD springs absolutely equals that much pressure- THE PROOF IS STARING YOU IN THE FACE. 
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esde
Samba Member
Joined: October 20, 2007
Posts: 5969
Location: central rust belt
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| Posted: Mon Jul 07, 2014 2:57 pm Post subject: |
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| I remember the 30mm pump with 10-30 and the HD springs pegging the 80psi gauge at idle. I never got to see how much it would have dropped when the oil warmed up, as it always blew the filter or cooler seals first.. |
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Max Welton
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williamM
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Joined: August 07, 2008
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Location: southwest Arizona
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| Posted: Mon Jul 07, 2014 6:38 pm Post subject: |
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Had a front relief stick once and it alone went to 100 psi and instantly blew 2 filters be fore we got it figured out- then we were asked to leave.
By the way- you can get 30 feet out of a blown filter. 
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Goshen
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Location: Miami. FL & Cartagena
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williamM
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Joined: August 07, 2008
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Location: southwest Arizona
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| Posted: Mon Jul 07, 2014 9:03 pm Post subject: |
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Fluid dynamics-- is there a doctor in the house.
think they have solved your problem- now go find those old springs.
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some days I get up and just sit and think. Some days I just sit.
opinion untempered by fact is ignorance.
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Goshen
Samba Member
Joined: April 03, 2012
Posts: 833
Location: Miami. FL & Cartagena
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| Posted: Mon Jul 07, 2014 9:22 pm Post subject: |
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| esde wrote: |
| Juanito84 wrote: |
| Is it just me or doesn't it seem strange the oil pressure goes down with increasing RPM? Wouldn't that possibly be a faulty reading, perhaps a gauge that is wired incorrectly? |
I saw the same readings too, using the HD springs; high at idle and lower at 2-3k. The idle pressure is high, and I suspect the forward relief valve is closed. As RPM increases so does pressure, the valve opens and pressure drops. On my engine I figured that the volume of oil flowing past the relief valve at that point was enough to hold it open until the engine was brought back to idle. At least that's what we thought, putting a stock spring solved the issue. 25 years ago and I had bought a 30mm pump, HD springs, the adjustable relief plug,and then was stumped when it blew coolers and filters on a weekly basis. Took an old German mechanic to set me straight, I was so mad to be removing $30 worth of new parts to make the thing run right, but that was the solution |
I have already blown two oil filters at the rubber seal of the filter where it mates with the spin on oil bracket. I had to rush over to WalMart to buy more oil.
The mechanic suggested i use Fram HP1 because its stronger.... So far so good. He also suggested that i replace the HD spring with stock ones.
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My '67 Split Window Bus project :
http://www.thesamba.com/vw/forum/viewtopic.php?t=634144
My '67 Maserati Blue Oceano Bug Build:
https://www.thesamba.com/vw/forum/viewtopic.php?t=541870 |
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