Water Pressure

[Reel Poor]

I am going to install water pressure gauges on my new Volvo 5.7 Gxi's and was wondering if anybody had an idea of how much water pressure there would be in a raw water cooled engine. I'm thinking 0-30 psi should be more than sufficient. I'm guessing in the 8-12 psi neighborhood.

 

[Bondo]

Re: Water Pressure

As you can see Here,.... Your 30lb. gauge Might be alittle short,... It Sounds High to Me, but I've never Tested it....

 

[Reel Poor]

Re: Water Pressure

Thanks Bond-o. I've got two 30 psi gauges comming so I'll let ya know what they run. Hopefully in a couple of weeks.

I could start a part ordering rant but I won't. :| 8)

 

[whywhyzed]

Re: Water Pressure

are you putting them in the block before the thermostat? or are you putting them in the raw water pump supply... or one of each? just curious...

 

[Reel Poor]

Re: Water Pressure

are you putting them in the block before the thermostat? or are you putting them in the raw water pump supply...

I would suspect either of those places would have about the same pressure as the supply would be backed up by the t-stat. My origional idea was to install them in the raw water pump supply to the engine. I really don't know. Ya got any suggestions?

 

[Bondo]

Re: Water Pressure

I've never put alot of Thought into it,....
I'd Think that as long as it's between the Pump,+ the Riser Outlets,...
It should show good Pressure.....

I Guess the Intake Manifold would be my 1st Choice,.....
If there's an Available Port to screw it into.......

 

[Reel Poor]

Re: Water Pressure

That was my thought also. There is a fitting in the water crossover on the front of the intake manifold, just to the right of the t-stat housing. That looks like it's as good of a place as any to me, and it very accessible.

 

[Rigidtool]

Re: Water Pressure

Dont take this as gospel or anything but here is my take on it. No matter where you put the guage I would think you are going to have massively fluctuating readings. As the thermostat opens you will get a major pressure drop, and after it closes you should see a major spike in pressure. Not sure what the "major" value would be. I am thinking that the nly useful info to be gained is the relative health of the water pump itself. Didn't want to throw a wrench in the works but its my 2 cents

 

[Reel Poor]

Re: Water Pressure

I am thinking that the nly useful info to be gained is the relative health of the water pump itself.

Yeppers, thats what i'm looking for, a relative indication of the health of the raw water pump.

 

[Reel Poor]

Re: Water Pressure

Well I installed the water pressure gauges in the intake as I showed in the pic above. At idle the pressure is about 5 psi and at cruise about 12 psi. Can't tell ya what it's gonna be a wot because I only have around 4hrs on the new motors so far.

 

[Coors]

Re: Water Pressure

If you put a temp one one the hose from the impeller to the engine, with a new impeller; wouldn't that give a baseline?

 

[Bondo]

Re: Water Pressure

Well I installed the water pressure gauges in the intake as I showed in the pic above. At idle the pressure is about 5 psi and at cruise about 12 psi. Can't tell ya what it's gonna be a wot because I only have around 4hrs on the new motors so far.

Yah But,..... We Gotta Know,.........8)

Go out there and Run the Living Snot outa that thing for a minute or 2..........
Just for a Baseline ya know...........d

 

[Reel Poor]

Re: Water Pressure

Well I installed the water pressure gauges in the intake as I showed in the pic above. At idle the pressure is about 5 psi and at cruise about 12 psi. Can't tell ya what it's gonna be a wot because I only have around 4hrs on the new motors so far.

Yah But,..... We Gotta Know,.........8)

Go out there and Run the Living Snot outa that thing for a minute or 2..........
Just for a Baseline ya know...........d

 

[Tail_Gunner]

Re: Water Pressure

Well a marine mech i am not, but running more that 10 psi in a engine seem's crazy to me.That is a lot of volume for a simple water pump, and as stated before, with the t-stat opening and closing man how could one get a constant to go by. Now i could understand multiple temp reading's and the correlation to vloume distributed, but for now im just trying to get these old eye's to lay a paint stripe straight.......

 

[Reel Poor]

Re: Water Pressure

TG, I put over 90 miles on those motors Sunday and I couldn't tell you by watchin the pressure gauges when the t-stats were open or closed. The water pressure stayed consistant, it only varied with rpm change. I never ran them over 3600 rpm's but it won't take me long to get 20 plus hours on the engines. I've never run water pressure gauges on an I/O before but so far they are reacting just as I suspected they would. It's really not the actual pressure that i'm interested in, it's noticing the lack of water pressure. Temp senders don't work in a dry motor. Don't ask me how I know this.

 

[Tail_Gunner]

Re: Water Pressure

8) I see say's the blind man, that is one hell of investment, and i too would want to have a bit of releif, if that is the word.Perhap's block temp gauge's would be the answer in this case, as to psi gauges in this modern enviroment we live in, it would be highly speciallized, wrong speeling but i am sure you get the ideal.........8)

 

[Tail_Gunner]

Re: Water Pressure

d Wrong forum.......:}