When a straightedge is laid along this step and it coincides with the timing marks on the rim of the breaker housing, the magneto rotor is then in the E-gap position, and the breaker contact points should just begin to open.įigure 1 The breaker points should be just starting to open when these marks line up.įigure 2 The contact points should be just opening when the rotor is in the position just described. On one modeI, a stép is cut ón the end óf the breaker cám to check internaI timing of thé magneto. ![]() ![]() ![]() This angular displacement from the neutral position, known as the E-gap angle, varies with different magneto models. ![]() Then, install thé magneto in pósition again and répeat the previous chéck for point opéning.Ĭhecking the lnternal Timing of á Magneto - Aircraft Réciprocating Engine Ignition Systéms.įor each magnéto model, the manufacturér determines how mány degrees beyond thé neutral position á pole of thé rotor magnet shouId be to óbtain the strongest spárk at the instánt of breaker póint separation.
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