1) Cam stroke 2) Stroke 3) Throw 
• (n.) An inward stroke; specif., in a steam or other engine, a stroke in which the piston is moving away from the crank shaft; -- opposed to outstroke.
In'stroke` noun An inward stroke; specif., in a steam or other engine, a stroke in which the piston is moving away from the crank shaft; -- opposed to outstroke . 
[n] - the stroke of an engine piston moving away from the crankshaft
noun the stroke of an engine piston moving away from the crankshaft
a stroke in an inward direction. · (in an engine) the stroke during which the piston moves into the cylinder.