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Jun/Jul 2008Subscribe NowEngine videos online! Check out the GEM video index on YouTube, the quickest way to find gas engine videos on the Internet. We’ve done the searching, all you have to do is the watching! Click below for GEM engine video index. |
ReflectionsA BRIEF WORDBy C. H. Wendel25/1/44 Magneto Information Q. Some models of the Fairbanks-Morse "Z" engines use the Bosch AB-33 oscillator, and others use the Fairbanks-Morse Type R rotary magneto. Can you provide some understanding on the differences? R. N. Holden, 2844 E. 12th Ave., Apache Jct, AZ 85219. A. The AB-33 Bosch was used on FBM "Z" engines from late 1919 to mid-1924. Effective with Engine No. 592989 the change was made to the gear-driven FBM Type R magneto. The AB-33 was simply a high-tension magneto with a long arm on its armature. A roller on the cam gear contacts this arm, moving it forward, and simultaneously pulling against a pair of heavy springs. When the roller goes past the tip of the lever, the armature suddenly returns to its resting position, and in so doing the points open and a spark is delivered to the plug. The gear... 816 of 15991 characters shown.
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