Final answer:
Cylinders of a four-stroke engine lie flat on either side of the crankshaft.
Step-by-step explanation:
Cylinders of a four-stroke engine lie flat on either side of the crankshaft. The crankshaft converts the reciprocating motion of the pistons in the cylinders into rotational motion, which powers the engine.
The four-stroke engine is commonly used in automobiles, motorcycles, and many other applications.