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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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