Importance

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Abstract

A timing analyzer for engine diagnostic testing includes a variable sensitivity knob for testing ignition timing for both a conventional four stroke engine and a DIS four stroke engine. The timing analyzer has a pickup which is adapted to be placed around a lead from a spark plug in the engine. During spark plug firing, a current spike appears in the spark plug lead. The timing analyzer is adapted to be triggered when a current spike above a selected threshold level is detected. When the timing analyzer is triggered, a pulse of light is produced from the nose cone of the analyzer. During engine operation, the spark plugs are continuously being fired, which creates a strobe light effect from the analyzer. The timing analyzer is aimed at timing marks on the engine block, and at a single mark on the rotating flywheel, which permit the engine to be properly timed. The variable sensitivity knob for the timing analyzer is adapted to variably control the threshold level for the analyzer trigger, depending on the particular type of engine being tested. The variable sensitivity knob can select a high sensitivity to test the ignition timing of a DIS four stroke engine, or a low sensitivity to test the ignition timing of a conventional four stroke engine.

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First Claim