The Ford Barn

rhpope · 11-18-2013, 08:32 AM

Was there a particular application for the mechanical advance limits for the 40B (16 deg. of advance @ 2500 rpm) vs. the 11a (24 deg. of advance @ 2500 rpm)? Was the 40B the very first one, say in 32-up a few years and then switched to 11a in the later 1930's. Also, was this at all related to the 2 bolt vs. 3 bolt coils?

As referenced in Bubba ad for the early distributors:

https://www.fordbarn.com/forum/showth...108#post767108

Thanks,
Roger

BUBBAS IGNITION · 11-18-2013, 09:38 AM

Roger ,

Here is the spec from the Ford Service Bulletin page 10 subject 12127-c

This same bulletin mentioned the fact that the engine had 2 ( 4 engine) degrees added TO THE DISTRIBUTOR BTDC before the distributor ..BEFORE THE UNIT IS INSTALLED.....
My thinking is thats why the flatheads start so easy......

Kurt in NJ · 11-18-2013, 09:56 AM

The March 36 service bulletin introduced the new dist (model 68) with 20 degrees advance @ about 1900 rpm, it had 3 bolts to the engine and 2 diagonal screws for the coil that is round with a flat top ---the style of points changed too, so you couild say when the coil went to 2 screws the advance changed too

DavidG · 11-18-2013, 12:45 PM

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No stamped number on the end of the distributor shaft was for '32s, With a 40 or 40A stamped in, the distributor was for a '33. Those with 40B stamped in were for '34 through early '36.

11-18-2013, 08:32 AM	#1
rhpope Junior Member Join Date: Aug 2010 Location: North Carolina Posts: 23	Early History Questions on Flathead Football Helmet Style Distributors Was there a particular application for the mechanical advance limits for the 40B (16 deg. of advance @ 2500 rpm) vs. the 11a (24 deg. of advance @ 2500 rpm)? Was the 40B the very first one, say in 32-up a few years and then switched to 11a in the later 1930's. Also, was this at all related to the 2 bolt vs. 3 bolt coils? As referenced in Bubba ad for the early distributors: https://www.fordbarn.com/forum/showth...108#post767108 Thanks, Roger

11-18-2013, 09:38 AM	#2
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: Early History Questions on Flathead Football Helmet Style Distributors Roger , Here is the spec from the Ford Service Bulletin page 10 subject 12127-c This same bulletin mentioned the fact that the engine had 2 ( 4 engine) degrees added TO THE DISTRIBUTOR BTDC before the distributor ..BEFORE THE UNIT IS INSTALLED..... My thinking is thats why the flatheads start so easy...... __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected] Last edited by BUBBAS IGNITION; 11-18-2013 at 09:47 AM.

11-18-2013, 09:56 AM	#3
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,673	Re: Early History Questions on Flathead Football Helmet Style Distributors The March 36 service bulletin introduced the new dist (model 68) with 20 degrees advance @ about 1900 rpm, it had 3 bolts to the engine and 2 diagonal screws for the coil that is round with a flat top ---the style of points changed too, so you couild say when the coil went to 2 screws the advance changed too

11-18-2013, 12:45 PM	#4
DavidG Senior Member Join Date: May 2010 Location: southeastern Michigan Posts: 10,670	Re: Early History Questions on Flathead Football Helmet Style Distributors Sponsored Links (Register now to hide all advertisements) No stamped number on the end of the distributor shaft was for '32s, With a 40 or 40A stamped in, the distributor was for a '33. Those with 40B stamped in were for '34 through early '36.