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Bosch vs. IHC Magnetos

L

LonM

Member
Our '45 M came with a MJC4C-302 American Bosch magneto. Sometime in the 50s it was converted to battery ignition and the mag has sat on a shelf ever since. I have a '49 H with an H-4 IHC mag on it, but it is not working very well. Can I put the Bosch on that H? Furthermore, can anyone tell me why the Bosch was used and/or why they went to the more popular H-4? The Bosch is a big heavy thing that appears to be built a little more substantially than the IH, but will it throw a better spark (assuming one was comparing two correctly functioning mags)? Thanks for any input.
LonM
 
Lon, not sure exactly why IHC offered different mags. The H4 mag is a well built, well engineered unit. There were a couple of different mags offered. Fairbanks Morse was another. The M and the H take the same mag / distributor (battery ignition).

Maybe someone else has more insight into why there were different offerings for the magnetos. Price maybe? I know that the 2 F-30's that I have owned both had Fairbanks Morse mags on them, and the IHC F4 was correct for the years they were built.
 
IH built the H4, perhaps it was cheaper to build than purchase, or perhaps they outsourced only what they did not want to handle.
 
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