There tends to be a misconception that a short stroke motor makes less torque or at a higher rpm than that of a long stroke one. A short stroke stays a TDC longer than a long stroke motor, timing events are less critical, lastly the area of the piston increases the force on the crank throw, increasing torque. The other benefit is less valve shrouding, so more flow into the cylinder. Other benefits are piston stability which decreases friction in the bore, the rods endure far less side loading, because the piston speed is lower at any given RPM the acceleration and deceleration seen at the piston and rod, at BDC and TDC, the shock loading is lower and more progressive. Years ago Hot Rod built two identical BB Chevy's. A long stroke 540 (using World Merlin Blocks) and a short stroke. The heads, cam, intake, etc. were swapped from block to block. The short stroke motor beat the long stroke in average torque, peak torque, average HP, and peak HP hands down. The real reason to build a stroker is cost. Its just so much cheaper to by a stroker kit than it is a new block, and still have to buy the rotating assembly to run a big bore. I believe I still have that tech issue stored downstairs, I'll see if I can find it and scan in the results. Might even be in hotrod's online tech.
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