angle of advance
Britishnoun
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the angle in excess of 90° that a steam-engine valve gear is in advance of the crank
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the angle between the point of ignition and bottom dead-centre in a spark-ignition engine
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.