02-12-2019, 02:39 PM | #1 |
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temp sender
I've been thinking of putting a 6 volt cooling fan from speedway in the '39. The car is still 6 volt positive ground. I can't seem to find a coolant sender for 6 volt to go to the relay to start the fan. I was told their 12 volt sensor/sender wont work with 6 volt. Question is could I use a sender from 1940 up to the early fifties when they were still 6 volt to use to go to the relay to kick the fan on. Thanks
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02-12-2019, 02:42 PM | #2 |
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Re: temp sender
Wouldn't think so, it would work completely different than a fan sensor. The original sensor is a pulse device that controls the current flow to heater coils to bend bi-metal components. You are wanting basically an on/off switch to trigger the fan relay. The two-terminal driver side sensor does that, but at a point near the boiling point.
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02-12-2019, 02:52 PM | #3 | |
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Re: temp sender
Quote:
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02-12-2019, 03:00 PM | #4 |
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Re: temp sender
They claim this is a 6v compatible controller, but I can't find it in the spec's.
http://www.maradynehp.com/mfa120.html |
02-12-2019, 03:11 PM | #5 |
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Re: temp sender
Someone has to make a 6v themo-activated switch. I'd do a search on ebay - and not just the car section. Thinking electronic/scientific.
~ Carl |
02-12-2019, 03:17 PM | #6 |
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Re: temp sender
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02-12-2019, 03:28 PM | #7 |
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Re: temp sender
Another link: https://www.amazon.com/Maradyne-MFA1...VS8PMXDKF7EGEF
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02-12-2019, 03:35 PM | #8 |
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Re: temp sender
The temp sender is just a switch. The relay activated by the switch would be voltage sensitive. We installed such a system for customer using a 6 volt starter solenoid for the relay. Electric fans usually require high current, particularly in a 6 volt application. In a 12 volt system, the amperage draw is reduced by half. We generally discourage electric fans in six volt vehicles because the charging system is inadequate.
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02-12-2019, 03:42 PM | #9 | |
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Re: temp sender
Quote:
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02-12-2019, 05:07 PM | #10 | |
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Re: temp sender
Quote:
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02-12-2019, 05:08 PM | #11 |
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Re: temp sender
thanks everyone for your help !
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02-12-2019, 05:15 PM | #12 | |
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Re: temp sender
Quote:
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02-12-2019, 06:18 PM | #13 | |
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Re: temp sender
Quote:
Wire in an override switch incase something fails so you can bypass the electronics and send 6V directly to the fan. There are the adjustable sensors with a capillary tube that slips into the radiator hose. I had one on a '66 Mini Cooper S that worked real well. Summit has this one. There are kits where the capillary tube slides\ under the hose and inside the upper tank. I though they would leak but the one I had was fine. There also kits where the capillary tube goes between the fins in the radiator core. I think you use one of these kits powered by a 6V to 12V converter. You can hook it up negative ground just by running the circuit's own separate positive and negatives wires from the battery. https://www.summitracing.com/parts/prf-30104/overview/ Last edited by Flathead Fever; 02-12-2019 at 06:35 PM. |
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02-12-2019, 07:35 PM | #14 |
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Re: temp sender
No starter solenoid. Neither a starter solenoid nor a horn relay is rated for continuous duty which a cooling fan control demands. Instead a simple Tyson/Bosch 40A 6v relay is adequate and inexpensive. A well chosen temperature switch is totally voltage independent.
There are too many questions here which really need a local speed shop professional to advise you on. Personally, I'm leery about any cooling fan on 6v. I just went through a lengthy search for a 16" 12v puller all of which draw about 20 amps. Limiting to a 6v puller to 20 amps mean a 10" fan which is marginal singular cooling fan. In your case, to accomplish better cooling, I'd strongly advise fashioning a shroud around your belt driven fan which doesn't require any electric components yet will give about the same cooling enhancement. |
02-12-2019, 09:50 PM | #15 |
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Re: temp sender
You are correct about the starter relay not being meant for continuous use but in this case its only going to carry 10-20 amps instead of 300+A. Unless the coil pull-in windings are not made for continuous use? That could be an issue. Many of the fleet vehicles I worked on had aftermarket second batteries added before they were delivered to us. To charge both batteries some of the vehicles had an expensive battery isolator and some just had a continuous duty solenoid that looked just like a single wire Ford starter solenoid but these was made for continuous use.
Summit has this single terminal grounding switch that could control the ground to a 6V relay. https://www.summitracing.com/parts/s...SABEgJgG_D_BwE Last edited by Flathead Fever; 02-12-2019 at 10:09 PM. |
02-13-2019, 04:17 AM | #16 |
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Re: temp sender
Most temp controls I've seen have on/off temps of 195°F on, 175°F off, but they are available all over the place. That good looking switch shown is 185°F on, 175°F off. Being that close means it could cycle too quickly. I suggest getting several opinions before spending $40 twice.
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