It's interesting to play with the numbers. Take two engines with 50 cubic inches per cylinder, one with a 4.0" bore, 4.0" stroke and the other with a 3.5" bore, 5.2" stroke. If you calculate the theoretical torque that the piston can apply to the crankshaft for a given cylinder pressure you'll find that it is exactly the same for both engines. (The increased "leverage" of the longer stroke is countered by the greater "push" of the larger piston's area.) The typically better low end power characteristics of the small bore, long stroke engine are due to the fact that low speeds is the only place this engine can operate due to the resulting small valves and piston speed limits and it is therefore tuned accordingly. It only makes sense for a manufacturer to tune the larger bore, shorter stroke engine to take advantage of the better breathing capabilities and higher speed potential in order to provide more power. The cam profile and timing that provides this often comes at the expense of low rpm torque but since power, not torque, is what determines how much work an engine can do in a given amount of time it is a worthy trade-off. Which is better or worse all depends on what you're doing and what you prioritize most.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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