Jun/Jul 2008

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LOW TENSION MAGNETOS

By Bud Motry

20224 Arthur Road, Big Rapids, MI 49307

There are several types of  low tension magnetos that are very popular in use on antique engines. Webster, Sumter, and Wizard were a few of the manufacturers of the oscillating type, identified by the extension springs on the front of the magneto as shown in the photo.

These magnetos were operated by a push rod that moved a lever to produce a movement of the armature around an arc of approximately 30 degrees. Another type of low tension magneto was the rotating armature type, very commonly used. We will discuss the oscillating type at this time, and will explain the rotary type in a subsequent article.

A low tension magneto had only one winding that was needed to produce a flow of current. It is an alternating current but this is of very little significance.

Basic electricity study tells us that all we ...

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