Photo: Honda Motor Co., Ltd. Often ridiculed by many gearheads, four-cylinder engines can be as potent as those with twice as many cylinders. Four-cylinders were among the first types of internal ...

It can make up to five horsepower. Scale-model engines are a great way to play with the mechanics without needing a lot of space. They allow for tinkering and tuning, and a new video shows how a ...