To the above I would repeat - torque is not determined by stroke! Maximum torque occurs at the RPM (for any stroke) at which the cylinder, most completely fills with air/fuel mixture. The engine designer determines the RPM point by port sizing, valve sizing, cam timing etc.
To the above I would add - long stroke engines have a smaller bore size for a given displacement. This is useful for heavy duty engines as it makes for a shorter crankshaft; a shorter crankshaft is stronger. In addtion the smaller pistons generate less force reducing bearing loads for a given torque level.
In applications where higher horse power and lighter weight is desired a larger bore is typically used because it allows for operation at higher RPM as explained in buickanddeere's post above.
As far as engine speed goes; crankshaft RPM is well understood. However, there is also piston speed to consider; average piston speed is given by; Piston Speed (ft/minute) = 0.166 x Stroke (inches) x RPM. Some of the long stroke engines we like to think are slow speed are really moving on the inside.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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