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 - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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