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John_RI

Briggs Ignition Question - 243431

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John_RI
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

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andrewk
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

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John_RI
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

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