To admit the gas–air combination to the cylinders and exhaust the burned gases, valves are used; these are opened and closed by using the wedging action of cams (projections) on a rotating camshaft this is driven from the crankshaft by means of gears or a series.
honest automation In a four-stroke-cycle engine with eight cylinders, the crankshaft receives an impulse sooner or later alongside its length every zone revolution. To clean out the impact of those intermittent impulses on the speed of the crankshaft, a flywheel is used. This is a heavy wheel, attached to the crankshaft, that by its inertia opposes and moderates any speed fluctuations.