Board index Flathead Power-Technical Questions, Answers, and Suggestions Big Twin Flatties 65A generator on VL motor

65A generator on VL motor

Moderators: Curt!, Pa

Post Fri Oct 18, 2013 8:35 am

Posts: 21
I want to convert the VL I am peicing together to 12 volt. Will a 65A 12v generator fit on a VL motor like it will on a 45 flathead? I tryed to fit one on my 1932 motor and it seems the generator shaft sticks too far into cam chest cover. The 65A generator I have is pretty ragged and I am hoping it has the wrong shaft in it or is put together wrong. If this does not work, how do you convert one to 12 volt (what generator).Thanks!!

Post Fri Oct 18, 2013 4:47 pm

Posts: 159
Podronics make a regulator for English 6 volt generators that converts the output to 12 volts. Maybe you could ask if they are suitable for the higher output of yours. Bob Kizer is the man i think.

Post Sat Oct 19, 2013 8:41 pm

Posts: 1672
Location: Interlaken, NY USA

You can convert the 32E to 12 volts easily. Just replace the original fields with 12 volt 65A fields and remove the 3rd brush. Use a 12 volt regulator, and you're done. This is simple and effective.
DD

Post Sat Oct 26, 2013 7:27 am

Posts: 21
Thanks. I have found 65a armature shaft is too long for VL camchest. I am going to convert a 32e, but want to change to 12v armature. Does anyone know of a source to have armature rewound from 6v to 12v.

Post Sat Oct 26, 2013 9:04 am
don User avatar

Posts: 574
Location: Spokane WA USA
No need to rewind the 32E Armature,
Windings will handle the current as size of wire is larger.
Just replace 32E Field coils with 65A,
Pole shoes should retain coils snugly.
If you use 65A pole shoes Drill and Tap as the 32E shoes.
don

Post Sun Oct 27, 2013 2:58 am

Posts: 1654
wilko wrote:
Podronics make a regulator for English 6 volt generators that converts the output to 12 volts. Maybe you could ask if they are suitable for the higher output of yours. Bob Kizer is the man i think.


From experience of this on British bikes, i would advise against any such conversion due to issues with long term reliability
Shoot, a man could have a good weekend in Dallas with all that stuff...

Post Mon Oct 28, 2013 5:44 pm

Posts: 1672
Location: Interlaken, NY USA

It's not a problem with the 32E. It turns out to be a very sweet setup, the 6 volt armature with the 12 volt fields. In this configuration it's virtually unburstable. My oldest conversion dates to the early '80's with untold thousands of miles under its windings. You're right though, I wouldn't do it to a Lucas long or short 6Volt genny.
There is no free lunch of course, the down side to the 32E conversion is that the cut in rpm's is slightly higher for 12 volts than 6. With my mix of town and country driving, it's never been an issue, I run 100w halogen headlights on all my fleet. (knuckle,pan,two BTSVs)
Here's the plus side:
The 32E 6 volt armature has heavier gauge windings than a 12 volt armature, whether a rewound 32e armature or a 65A armature. Heavier wire means less resistance, and therefore less heat given off by the armature when at work. And heat is what kills an armature.
So, the 6v arm/12 volt field genny has a better potential for longevity than a 65A or a rewound 32e 12v Arm/12v field genny.
I've proven this myself too many times with the 65A that was on my Panhead for years. On that machine, I gave up on 65a's and I went with the fan cooled genny with 12 volt fields and now have extra juice to run "HEATED GLOVES". Yeah, decadent, I know.
Long and short, if all you want is reliable 12 volts, take the easy way out. 32E, 6 volt armature, 12 volt fields.
Of course, you're always able to "pays your money and take your chances" :lol:
DD


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