[Marine One]

Just to clarify - "longer stroke" implies an increase in crankshaft stroke, an increase in rod length and a decrease in piston pin height (move the pin closer to the rings).

Dwell time, piston speed and piston velocity is increased with this combination of a true "long stroke"engine. Simply increasing the stroke of the crankshaft alone and leaving everything else the same will not change much of anything, including piston dwell at TDC. Hope this helps.