Ignition timing meaning

Ignition timing definition

It is important that the spark coming from the spark plugs ignites the air-fuel mixture at the correct moment determined by the manufacturer of the engine. Often this is a few degrees before top dead center (BTDC). Suppose the specs indicate that it should be set at 5 degrees BTDC, but in actuality it is set at 6 degrees. In that case, the timing is advanced. If it were set at 4 degrees, the timing is retarded . Incorrect ignition timing may result in poor performance and excessive fuel consumption.

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Automotive terms beginning with "I", page 3

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