after top center/after top dead center

The position of a piston in the cylinder of a reciprocating engine after the crankshaft, turning in its normal direction of rotation, has caused a piston to pass the top of its stroke and start back down.
The crankshaft, crankpin, and cylinder are all in line at top dead center and thereafter direction of motion of piston changes from upward to downward at “after top center.”

Aviation dictionary. 2014.

Look at other dictionaries:

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