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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that�s wha
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