angle of advance

noun

1. the angle in excess of 90° that a steam-engine valve gear is in advance of the crank

2. the angle between the point of ignition and bottom dead-centre in a spark-ignition engine

Example Sentences

This is the total angle of advance.

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The angle between E and E1 is called the angle of advance.

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You will notice that the "angle of advance," denoted by the arrow A, is now very considerable.

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If the valve has to have "lead" to admit steam before the end of the stroke to the other side of the piston, the angle of advance must be increased, and the eccentric centre line would lie on the line E2.

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Therefore—total angle of advance = angle for lap and angle for lead.

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