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  #1 (permalink)  
Old 04-20-2015, 08:27 AM
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Default Water manifold

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
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Old 04-20-2015, 09:22 AM
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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
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Old 04-20-2015, 09:55 AM
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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!

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Roger
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Old 04-20-2015, 11:19 AM
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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.
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Old 04-20-2015, 11:57 AM
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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
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Old 04-20-2015, 12:26 PM
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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.
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Old 04-22-2015, 03:48 PM
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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
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Old 04-22-2015, 06:12 PM
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I should try mine on the stove and see exactly what temp it closes. I'll let you know what I find.
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Old 05-12-2015, 09:38 PM
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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.

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Old 05-13-2015, 12:47 AM
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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.

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