Pressure relief valve?

[JakesBackyard]

Does anyone have an idea where I could find a small, low pressure
(3-4lb) relief valve to adapt to the radiator drain tube on my '35.  I've read about a guy in Florida that has done it, but have been unable to get a response from him.

Something similar to this is what I have in mind.  This one is from Speedway, but is 15lb.

Thanks

[Tom]

I can't help you with a valve...........but can you tell me what your are trying to do??

[Eyeball]

Yes, why?

[JakesBackyard]

I want to pressurize the cooling system slightly (3lb) to raise the boiling point and improve the cooling.  My original plan was to block off the drain hose and add a tee and cap to one of the upper hoses.  Then I read on a forum about this relief valve in the drain tube deal and thought it would look better than the tee idea.  I don't have enough room between the cap and hood to add a pressure cap in the stock location.

Any ideas???

[Tom]

Ok, I see. Will the stock cap hold 3lb?

[JakesBackyard]

Yes.  It should hold at least 5 or so.  I've read of many people putting the tee fitting with a 4lb cap on it.  If you go more than 4 or 5 on a stock radiator you are likely to blow out the seams of the rad.  They don't have any baffles or anything to hold the thin metal together.

For every 1lb. of pressure, the boiling point is raised 3-4 degrees.

So I'm still looking....anyone know of a relief valve for any other use that is low pressure or possibly adjustable?

Thanks

[Eyeball]

Is something wrong with your cooling system. I have not had a heating problem (knock on wood) with either of my flat motors.

[JakesBackyard]

I'm not going through the motor.  Just cleaning everything up on the outside.  Getting the radiator cooked and pressure checked to about 5lb. I'm putting kits in the water pumps.

The little bit I drove it since I got it, it runs very nice, but if low speed or idle it starts to get pretty warm.  As soon as you get it going at 30 or so it cools down again.  

I don't think it's too big of a deal.  But as long as the radiator is out, I figured it would be a small, quick deal to pressurize it.....if I can find a small valve.

[JakesBackyard]

Fianally made contact with "Skip in Florida".  The valve, hose and clamps are on the way.  He was going to mail it today and doesn't take cards....just told me to put a check in the mail.  Must trust us Norskies from the northland!

Sounds like it works in an interesting way.  He (and others who have used it) say by putting 3lbs. pressure on the system, you don't loose any coolant.  It will run for many miles and never loose any coolant like they do with no pressure.  We'll see in the spring. Goes on the drain tube.

Here's his link....He is noted as a great flathead coil and waterpump rebuilder....

http://www.fordcollector.com/coils.htm

[Eyeball]

Glad you found where to get one. I looked allllll over the internet but came up empty.