| bob358rt | -- 07-03-2013 @ 12:42 PM |
|
My 35, 5 window with 49 8RT and 6 volt system leaves no room for the stock radiator fan. Thinking of installing a 6 volt fan from Speedway. Will the 6 volt system support the current draw? Believe the fan draws 8 to 10 amps. Any suggestions on options? I'm even considering converting to a 12 volt system. Thanks! Rule No. 1 - DO NO HARM!
|
|
| TomO | -- 07-03-2013 @ 4:43 PM |
|
That depends upon which generator you are using. The 35 generator only supplies about 17 amps if it has not been modified. The 49-51 generator supplies a max of 35 amps and would not have a problem supporting the fan. You could also wire the fan with a switch to turn it on when idling or in slow traffic or go fancy and use a thermostatic switch to turn it on when the engine is hot. Tom
|
|
| trjford8 | -- 07-03-2013 @ 6:06 PM |
|
In addition to Tom's advice you should wire the fan with a relay to take the load off the switch.
|
|
| 40cpe | -- 07-04-2013 @ 6:17 AM |
|
Speedway's site says the fan is 2500 cfm but the spec page doesn't list a current requirement. My memory is that a 12v fan with that output requires about 20 amps. If the 6v fan does pull 2500 cfm, the amp draw is going to be significant. You need the amp draw from speedway to be sure you have the capacity to run it.
|
|
| bob358rt | -- 07-04-2013 @ 6:29 AM |
|
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!
|
|
| 40cpe | -- 07-04-2013 @ 7:29 AM |
|
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
|
|
| flathead4rd | -- 07-04-2013 @ 7:33 AM |
|
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.
|
|
| buford8 | -- 07-04-2013 @ 12:42 PM |
|
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!
|
|
| supereal | -- 07-04-2013 @ 1:38 PM |
|
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.
|
|
| bob358rt | -- 07-09-2013 @ 8:16 AM |
|
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 | -- 07-09-2013 @ 10:26 AM |
|
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.
|
|
| BrianCT | -- 07-09-2013 @ 1:42 PM |
|
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
|
|
| bob358rt | -- 07-12-2013 @ 6:08 AM |
|
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!
|
|
| bob358rt | -- 07-12-2013 @ 6:13 AM |
|
This message was edited by bob358rt on 7-12-13 @ 6:15 AM
|
|
| EFV-8 Club Forum : | https://www.earlyfordv8.org/forum |
| Topic: | https://www.earlyfordv8.org/forum/viewmessages.cfm?Forum=18&Topic=6265 |