| Also, 80 percent of snowmobile riders next season would be led by a guide and use reportedly quieter and less polluting four-cycle engines. |
| At the top is shown the torque diagram of a single-cylinder motor of the four-cycle type. |
| The greater number of engines used in automobiles to-day are of the kind known as the Otto cycle, or four-cycle, engine. |
| This is true with either one of two forms of four-cycle motors. |
| Some of the matters discussed were the four-cycle engine, carburetion, transmission and differential, and the storage battery. |
| The two-cycle engine is simpler in construction than the four-cycle, having no valves. |
