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EFV-8 Club Forum / General Ford Discussion / Electric Fan

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Discussion Topic: Electric Fan -- page: 1 2

bob358rt

07-12-2013 @ 6:13 AM

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This message was edited by bob358rt on 7-12-13 @ 6:15 AM

bob358rt

07-12-2013 @ 6:08 AM

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I decided to go with the 12v alternator & electric fan..I appreciate all the assistance. Now I have to decide where to purchase it. Any suggestions? There are allot of vendors out there & its hard to choose who is the best to deal with.
Thanks!

Rule No. 1 - DO NO HARM!

BrianCT

07-09-2013 @ 1:42 PM

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Here is my experience.
36 Ford with stock 8BA.
Pusher fan installed by previous owner.
I hardly ever switch on the fan.
Every extra horsepower is good.
Our Main Street has about 10 stop lights
and if I don't get more than 5 red lights
I never use the fan. Maybe just lucky and
have a good radiator.
I do run a 12V alternator

supereal

07-09-2013 @ 10:26 AM

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The one wire type relies on residual magnetism in the rotor to turn it on. This can mean revving the engine very high if the alternator hasn't been used for a time, as is often true of hobby cars. The two wire kind has a connection to the ignition switch which tells the unit to turn on when the car is started, which allows immediate charging. Newer cars use a third wire directly connected to the battery which senses battery charge level, as well. Others control charging from the on board computer. I have a one wire in my '47, and I devised a connection to the alternator by a switch under the dash to wake it up if it doesn't respond quickly. I made a small pulley for it, but it is still lazy. Flatheads turn slowly, anyway, and all alternators require fast rotation. Look at the relative pulley size on your modern car, and you will see how they do it.

bob358rt

07-09-2013 @ 8:16 AM

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What is the differences and advantages between the two wire and the one wire?

Thanks for the help!

Rule No. 1 - DO NO HARM!

supereal

07-04-2013 @ 1:38 PM

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As well noted above, electric fans demand more power than the stock generator can provide, not including the headlights and any other high wattage accessories. When I went to halogen headlights in my stock '47, I had to convert to a 6 volt alternator. If you do that, be sure to get the two wire type, rather than the common one wire variety, and a thermostatic controlled fan relay is required. If you don't have room for a "puller" fan, check to see if a pusher fan, that mounts in front of the radiator, will fit. Adequate fans tend to get expensive as quality goes up.

buford8

07-04-2013 @ 12:42 PM

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Hi Bob, a high ouput 6 volt alternator is available for your application from several of the early V8 vendors...it might be more work but I think a 12 volt swap will be cheaper...Good luck.

You mess with me, you mess with the whole trailer park!

flathead4rd

07-04-2013 @ 7:33 AM

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My expierence with an electric fan was this. I put one on my 50. It had been converted to 12 volts with a 12 volt generator. The generator could no keep up with the fan's requirements so had to change over to an alternator. Problem solved.

40cpe

07-04-2013 @ 7:29 AM

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I have a Motors manual that covers models '35 to '49; it says that the '39 up generators produce a maximum of 30 amps at engine RPMs of 1160 to 1650. It says the part number is 21A-10000

bob358rt

07-04-2013 @ 6:29 AM

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According to VanPelts the generator is a 1942-46 (part #21A-10050). Is this the same amp rating as the 49-51?

Thanks!

Rule No. 1 - DO NO HARM!

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