Oil Pressure Relief Valve Comparison

[Powerhouse]

Howdy all....

 

I have been wondering about the difference between the 3 valves I have.  I have been running the newer vpw one. Any pointers are greatly appreciated.

 

Also...my oil pressure gauge is plumbed through the 2 port from front on the oil galley.  I get very high readings, about 3/4 over on the gauge, at speed and cold idle.  But around 30 at hot idle.

 

I know the springs came in hard(green), regular(unpainted) and soft(red).

 

This video is VERY good material:

 

 

These are the different valves I have.

 

Edited May 31, 2013 by Powerhouse

[Powerhouse]

wow.... no takers?  I guess I stumped the Mopar Magicians.   hahaha

[RobertKB]

Can't comment on the valves. However, your oil pressure sounds great. I wouldn't touch a thing.

[Dodgeb4ya]

Mr Tech couldn't help you?

[james curl]

I installed the new type in the 41 Dodge 218 engine in my P-15 after the original spring broke and the new plunger came with a spring and was improved according to the literature that came with it.  The 218 in the 48 engine that I removed from my P-15 had the larger plunger where the spring goes inside of the plunger, tried to use the spring with my old plunger after the original spring broke but had 80 psi oil pressure on start up.

[Dodgeb4ya]

The VPW is a old stock replacement "Thexton" relief valve.

[Tom Skinner]

If memory serves me, the Black one is for normal - standard use.

Beyond that it sound like your oil pressure is fine.

[Powerhouse]

Nice find with the "thexton" info!  I have seen the longer valves but am guessing they are for different size engine.  Mine are the short ones.  

 

I am wondering if where my oil gauge pick up line is connected is to far ahead of the valve to get corect pressure reading.  Or if that even matters.  

[Don Coatney]

The oil pressure in the galley should be the same no matter where your gauge is connected.

 

[Dodgeb4ya]

 The picture is just an artists rendering showing the valve as being longer than it is.

Nice find with the "thexton" info!  I have seen the longer valves but am guessing they are for different size engine.  Mine are the short ones.  

 

I am wondering if where my oil gauge pick up line is connected is to far ahead of the valve to get corect pressure reading.  Or if that even matters.  

Edited June 2, 2013 by Dodgeb4ya

[Powerhouse]

Thanks for the info guys.  

 

I re-routed the oil line from the #4 oil gallery port just to keep it per the book.  Still the same reading, as expected. 

[Cpt.Fred]

This is good info, great movie! Thanks for sharing.

 

My pressure relief valve spring was broken into pieces and my oil pressure went down to nearly zero at idle

after longer autobahn travel, so i decided to get a new one. Well, "new" wasn't available so i got a good used one from

an old engine a friend has laying around in his shop, either 218 or 230cui.

The plunger in my 201 is very long, and the spring i got is as well, so i have quite some pressure on the spring now.

It's not easy to get the cap screwed in, makes me wonder... i now get 60psi or even more at idle, and the needle jumps right

out of the scale when i rev the engine. Hot engine idle still reads around 45 psi.

That's too much, i guess...

 

Maybe i should dig around in my spring collection to find something more suitable.

 

If i understood the video correctly, to much spring pressure will prevent the bypass filter working correctly.

What else could go wrong with oil pressure beyond 80psi?

[Young Ed]

Fred can you go back to your buddy and get the piston that matched the spring you put in?

[Cpt.Fred]

I'll try various springs and take a close look at what happens to the gauge readings.

Getting the other piston is a good idea, though, i'll call him and ask if it's still there and what condition it is in.

[_shel_ny]

cut the spring

[Cpt.Fred]

hmm, i'd rather not. they're pretty rare around here...

 

just made a couple of test rides, i have found a spring that gives me around 40-50psi at cruise speed.

didn't get the motor hot enough, though, so i take a small selection of springs on the trip tomorrow and

change if it seems necessary.

[greg g]

Yeah, anything prolonged over 60 isn't going to be good for things, it will want to push out of areas where it is supposed to be, and past seals.  Your 40 to 50 should be OK,  My enggine runs about 45 at cruising speed.  Instead of messing with other springs, maybe you could temporarily block bits of your radiator with cardboard till you find the happy medium of a good spring and engine temp.  Seems easier than crawling under and swapping springs.  Then you can find something nicer to make a blocker out of and make it removable for hot days.

[Don Coatney]

I replced a broken spring in my engine several years ago. I believe I bought my new replacement from Vintage Power Wagons. If I recall the springs are color coded for pressure ratings.

 

[Cpt.Fred]

take about one third of the spring on the photo, break that in half and you get what fell out of my engine...

it was running surprisingly good with that, actually. *cough*

we'll see. i can easily reach the valve from the drivers side without any crouching, so that's not an issue on the P10.

if you want something hard to reach let's talk batteries...

[Don Coatney]

What happened to the rest of the broken spring?

[Cpt.Fred]

it disappeared into thin air.

 

 

 

 

 

i hope.

 

seriously, i don't know.

when i opened it for the first time i took the biggest remaining spring parts, cleaned everything,

added a screw to increase pressure as an interim solution and then... forgot about it until last week.

shame on me.

 

 

 

 

anyway, the new spring is great!

i had constant 40psi oil pressure at cruise speed (55-65mph) and 20psi at idle / hot engine.

happy happy happy.