100分求一篇2500作左右的汽车专业英语文章！

The diameter of the cylinder is called the engine bore.Displacement and compression ratio are two frequently used engine specification.Displacement indicates engine size.and compression ratio compares the total cylinder volume to compression chamber volume
The term"stoke"is used to describe the movement of the piston within the cylinder.The operating cycle may require either two or four stroke to complete. Most automobile engines operate on the four stroke cycle
This type of engine is also know as Otto cycle,after the name of its inventor, Nikolaus Otto,who first applied the principle in 1876.In the 4-stroke engine, four strokes of the piston in the cylinder are required to complete one full operating cycle. Each stroke is named after the action.It performs intake, compression,power, and exhaust in that order, shown in Fig.1-2
1.Intake stroke
The piston moves downward to the bottom dead center,a vacuum is created in the cylinder.The intake valve ope