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"E-gap" stands for Efficiency Gap. It is the specific number of degrees past the magnetic neutral position where the points are timed to open.

When this post is connected to the engine or airframe ground via the cockpit switch, the primary circuit is short-circuited. This prevents the magneto from generating the high-voltage pulse needed for a spark. Safety Warning:

Whether you are looking for or full overhaul specs ?

However, a Scintilla magneto is only as reliable as its maintenance. Whether you are holding a Bendix-Scintilla S-20 or a classic V-AG series, this guide serves as a practical manual for understanding, timing, and preserving these mechanical masterpieces. 1. Understanding the Scintilla Operating Principle