The Ford Barn

40cpe · 03-21-2016, 05:44 PM

I think I remember a while back that someone said some of the G.M. alternator brackets for the flathead are flimsy. I've searched and can't find thread(s) on it. It there a better bracket to look for?

Drbrown · 03-21-2016, 06:03 PM

I have a Delco 12SI 78 amp alternator on my '47 with the typical yoke adapter. Been on the motor at least a decade with no problems. I've never observed any flimsiness, weakness or wobbling. I don't know who manufactured it but I will look closer tomorrow to see if there's a name on the casting.

Thaplumbr · 03-21-2016, 06:33 PM

I bought mine from Allen Grove Components,good quality,speedway sales one as well,my dad has one from them!

Ross F-1 · 03-21-2016, 07:06 PM

I had a problem with mine. Partly due to using too long a belt (the alternator was high to get belt tension), partly undetermined harmonic vibrations. I now use a shorter belt and also reinforced the slingshot to be stiffer fore-aft, no more problems. (note I am using the narrow belts)

41LjH · 03-21-2016, 07:14 PM

Sponsored Links (Register now to hide all advertisements)

Certified Auto Electric in Ohio

03-21-2016, 05:44 PM	#1
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,024	alternator adapter I think I remember a while back that someone said some of the G.M. alternator brackets for the flathead are flimsy. I've searched and can't find thread(s) on it. It there a better bracket to look for?

03-21-2016, 06:03 PM	#2
Drbrown Senior Member Join Date: Oct 2013 Location: Glens Falls NY Posts: 1,267	Re: alternator adapter I have a Delco 12SI 78 amp alternator on my '47 with the typical yoke adapter. Been on the motor at least a decade with no problems. I've never observed any flimsiness, weakness or wobbling. I don't know who manufactured it but I will look closer tomorrow to see if there's a name on the casting.

03-21-2016, 06:33 PM	#3
Thaplumbr Senior Member Join Date: Jul 2012 Location: jacksonville,arkansas Posts: 160	Re: alternator adapter I bought mine from Allen Grove Components,good quality,speedway sales one as well,my dad has one from them!

03-21-2016, 07:06 PM	#4
Ross F-1 Senior Member Join Date: Nov 2010 Location: NM Posts: 2,438	Re: alternator adapter I had a problem with mine. Partly due to using too long a belt (the alternator was high to get belt tension), partly undetermined harmonic vibrations. I now use a shorter belt and also reinforced the slingshot to be stiffer fore-aft, no more problems. (note I am using the narrow belts) __________________ '52 F-1, EAB flathead

03-21-2016, 07:14 PM	#5
41LjH Senior Member Join Date: Dec 2011 Location: NW North Carolina Posts: 461	Re: alternator adapter Sponsored Links (Register now to hide all advertisements) Certified Auto Electric in Ohio __________________ 3 pedals, 3 gears, no valve-covers.. *Now THAT* is a hot rod** !! https://www.youtube.com/watch?v=ZmwwB34vxJE