So what do you guys think? I may be ignorant, but I have soy'ched and have not been able to find anywhere, a coolant/water pressure system guage. You know, like the pressure tester pump that has the gauge on it.

Maybe there is such a thing and I just haven't come across it.

 

Just curious, but why would you want this?

It could probably be made I would guess using an oil pressure sending unit and gauge.

 

I would just like to gauge, especially now, if my water pressure drops dramatically while sitting in traffic. I think it'd be a great diagnostic tool to have while on the road when a pressure tester pump is not readily available.

 

I'd imagine a fuel pressure/oil pressure type gauge would work. I'd lean towards an electrical fuel pressure gauge and isolator would be the best bet, as you can get the lower pressure fuel gauges for more needle sweep (5-20 psi vs 10-80 psi)

Regards,
Frank

 

A water temp gauge will quickly tell you if things are going seriously wrong with your coolant system (such as the pressure dropping when your radiator barfs).

 

I would think the fuel pressure gauge would work. Sounds pretty cool! I agree that water temp gauge can tell u what u need to know but this would be a handy diagnostic tool. Keep me updated if you figure something out! Aloha Dave

 

Dave, still workin on it....

 

Thats actually a pretty good idea. I wouldn't wanna be looking at it all the time though, maybe you could house it somewhere not usually viewable? I'm thinking like even under the hood, coming off the radiator or something?

Anyways, good idea, lets see pics and a writeup when it gets done.

 

Why don't you get a gauge to measure the exhaust pressure too, while you're at it?

 

One per rotor too right!! So if a apex seal cracks you can see the change in pressure! I think under the hood is a cool location.( for the coolant press. gauge)

 

Yes there is one to answer your question

 

Outboard engines for boats have water pressure gauges available. I am pretty sure NORDSKOG or GAFFRIG or FARIA have several different models to choose from.
You're gonna pay a pretty penny, just to forewarn ya!

 

I used a standard 0-30 psi pressure gauge, teed into an ast line, to check coolant pressure for a few days.

pressure rises quickly from cold start and hits cap set point in less than a minute. With 16 lb cap and warmed engine, would be like 8 psi cruising, up to 16 getting on it, then drop near zero with long downhill run at light load. due to rad airflow. In traffic, will be at 16 psi while coolant gets hotter, then drops when fans come on.

the fluid is not compressible, but has a high expansion coefficient. slight changes in average system temp will make a big change in pressure.

There is no fixed correlation between pressure and temp in the system ... can be cold and high pressure, or very hot and low presure.

I would just use a cheap boost gage for short term testing, or low range electric fuel pressure gage for long term use as someone suggested.

 

KEVINK2---- You said it man.

All you need is a Standard pressure gauge, you can hook it up to your butt plug if you want to too, its universal for the most part HAHA

 

Thanks for all the info. Even your's Jim.

 

Here you go Series..

http://www.egauges.com/eg_typeI.asp?...Pressure&Cart=

They dont have a pic of them, but those are it.