Engine cylinders are arranged in L - type in - line and V - type W-type arrangement Horizontally opposed engines (h-arrangement). Cylinder refers to a piston driven by the pressure excitation or expansion force of the working fluid in the automobile combustion chamber. The classification and description of cylinder arrangement are as follows:

1. L-type in-line: all cylinders are arranged side by side at the same angle into a plane, and only one cylinder head is used. At the same time, the structure of the cylinder block and crankshaft should be relatively simple, for example, the cylinders stand in a column

2. V-type arrangement: divide all cylinders into two groups and arrange adjacent cylinders at a certain included angle (the included angle of the center line of the left and right cylinders) γ< 180 °), so that the two groups of cylinders form a plane with an included angle. From the side, the cylinder is V-shaped;

3. W-type arrangement: stagger each side cylinder of V-type engine at a small angle to form a W-type engine;

4. H-type arrangement: the included angle of cylinders of horizontally opposed engines is 180 degrees. However, the manufacturing cost and process difficulty of horizontal opposed engine are quite high

High.