Water manifold

[rsk289]

I finally gave up trying to work a convoluted tube from my radiator to the passenger's side water pump outlet, and made up a copy of an original in stainless instead. The Otter switches are repros made for Jaguar E-types and readily available, but they probably don't work well - time will tell. Threads are 2BA.



Roger

[LMH]

Nice job! I bought my thermal switch from Brown and Gammons. It's originally for MGB GT V8. Most of the others I kept running across were for choke. Hardly interchangeable!
Larry

[rsk289]

Thanks for the compliment. The MGB V8 Otter switch sits in the intake, whereas the Cobra one is in the lower hose, which will generally be a good bit cooler than the intake. Does the MGB one come on at the correct temperature? I'd have thought its heat range would be too high. That's why I chose the two-terminal one sold for V12 E-type, as it too sits in the lower hose.
I'd be really interested to know if yours works OK!

Cheers
Roger

[LMH]

I can't tell you how it works yet. The that's quite a ways away for me. I was told it should switch the fan on about 170*F but I'm not sure. It doesn't give a temp rating and B & G didn't say in their discription.
Larry

[rsk289]

Originally Posted by LMH

I can't tell you how it works yet. The that's quite a ways away for me. I was told it should switch the fan on about 170*F but I'm not sure. It doesn't give a temp rating and B & G didn't say in their discription.
Larry

OK, we need to keep talking when one of us finds the answer!
Roger

[LMH]

Sounds good to me! I have been working on 2583 and I think the owner has one like mine on order from B & G, so I may be able to have an answer in a couple weeks. I'll let you know what I find out.
Larry

[rsk289]

Now this gets interesting. The switch I ordered arrived today, and is marked 92/87°. Obviously this is Celsius, and surprises me because it is sold for the lower hose section of a V12 E-type. I would expect a switch in this position to switch on at a much cooler temp than 92°C, as this is right next to the bottom of the rad and is the coolest part of the cooling system. I also have a switch for an early E-type, which is unmarked. This is a single Lucar connector type and in the kitchen saucepan test (wife was out) it closed contacts at about 90°, so I'll try that. Still some way off first fire-up, though...

Roger

[LMH]

I should try mine on the stove and see exactly what temp it closes. I'll let you know what I find.
Larry

[LMH]

Roger,
Finally got to test my thermal switch on the stove and found it closed at 195*F. Looks pretty close to the one you have and a long way from the 170* I was told. It'll still work for me though.

Larry

[rsk289]

Originally Posted by LMH

Roger,
Finally got to test my thermal switch on the stove and found it closed at 195*F. Looks pretty close to the one you have and a long way from the 170* I was told. It'll still work for me though.

Larry

Thanks for letting me know that, Larry. Do you think your lower hose temp will get that high? I tried a bottom-tank switch of around that rating in my Mustang last year and the fan never switched on, even though my infra-red thermometer was showing the engine getting pretty hot. Interesting to see when it's running - I'm still hung up on exhaust manifolds, so can't run anything yet.

Roger