Lesson 1/Learning Event 1
Learning Event 2:
DESCRIBE COMPONENTS AND CONSTRUCTION OF MULTICYLINDER ENGINES
In an engine with more than one cylinder, the cycle of operation is the same at each cylinder. Adding more
cylinders, however, does lead to smoother operation because other cylinders will be furnishing power between
the power strokes of the first cylinder. For instance, in a four-cylinder, four-stroke-cycle engine there is one
power stroke for each half turn of the crankshaft. If the engine has more than four cylinders, the power
strokes will overlap. To understand the engine in greater detail, a study of its parts is necessary.
FIGURE 17. CYLINDER BLOCK.
The cylinders and the upper part of the crankcase are usually made together in one block of metal called the
cylinder block. In L- and F-head engines, the block has valve seats and ports beside the cylinders. It also
serves as a mounting foundation for the crankshaft and other engine parts.