Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

Sign in to follow this  

Briggs Ignition Question - 243431

Recommended Posts

I recently picked up a 10 hp briggs mod: 243431, code: 1132-01, dated 1982 and I just noticed that it doesn't have the external points set-up. Does this mean that it has the magnetron ignition? If so, where is it & how does it work? Thanks, John

Share this post

Link to post
Share on other sites
It does have the magnetron ignition. The magnetron is a solid state coil, so it is where the coil normally is- mounted by the flywheel. The following is from the briggs site- "When the points close, electron flow causes a magnetic field to be created around the primary. This field also envelopes the secondary. The points now open, break the circuit and collapse the field through the primary. The field caving in on itself is movement just like the rotating magnetic field of the flywheel. This movement is at speeds much greater than the flywheel could spin - near the speed of light. The rapidly collapsing field tears through the secondary winding which has sixty turns of wire for every one turn of the primary - effectively generating 60 times the voltage created in the primary. The sum total of this is that the secondary winding can create up to 25,000 volts in some systems, which is used to jump the air gap of the spark plug and ignite the fuel/air mixture in the combustion chamber. Now for the black box. Magnetron™ solid state ignition systems, in essence, replace the mechanical breaker points with a transistor. That is, we replace a mechanical switch with an electronic one. No moving parts, no arcing, no adjustments and solid state reliability." Hope that helps- Andy

Share this post

Link to post
Share on other sites
Thanks Andy, I figured it was something like that. I do recall a fair amount of posts on the magnetron ignition but not having one I didn't pay a lot of attention to them. I'll go back and look them over. They must have made the switch sometime prior to '82. I was just surprised not to find the points cover when I was looking at the engine. Progress I guess! Thanks again, John

Share this post

Link to post
Share on other sites
This topic is now closed to further replies.
Sign in to follow this  

  • Who's Online (See full list)

    There are no registered users currently online

  • Today's Birthdays

    1. Mike_H
      (43 years old)
  • Recent Status Updates

    • Paul M.Murphy

      Paul M.Murphy

      Hello glad I got on this site. I hope to upload a couple of photos of my Simplicity Broadmoor 
      Model 707 Tractor. I have replaced all the belts on it and installed a new ignition switch.
      Have a mower deck which was in poor shape , repaced a couple of bushings and welded the
      deck where there was some holes. The tractor and mower deck came from a friend and the 
      mower deck metal was getting pretty thin. Some new metal was put in it and we also undercoated the underside of the deck. This was done by my friend Greg Toulman.
      I have not put the mower deck on the tractor yet, waiting for Greg to come home and give me a hand. Can you please tell me if there is a manual for the mower deck and where I could get one.
      I would also like to get some moon wheel discs as well.
      I will try and down load some photos of the tractor when my wife shows me how to. 
      I really love driving this tractor and also how well it is made compare today's tractors, especially the flexible rear end and the rollers.
      Tell the next time 
      · 8 replies
    • jbrooks

      jbrooks  »  Talntedmrgreen

      folowing  this from a link at the downloads.  I just rescued an AC 920 with the lambodini diesel. I can' t download  yet .  Where did you find the PDF copy you posted. . I would like to figure out how to adjust the injection pump. 
      I assume it's a bosche, correct
      · 0 replies
  • Adverts