How does a 4-stroke engine work step by step?
John Castro
Published Feb 11, 2026
How does a 4-stroke engine work step by step?
An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust. As the piston moves during each stroke, it turns the crankshaft. Encyclopædia Britannica, Inc.
How does a OHV engine work?
In overhead valve (OHV) engines, the valves are positioned above the piston. The camshaft moves the valves through a tappet, pushrods and rocker arms. 4-stroke OHV engines provide more efficient combustion by allowing the air-fuel mixture to spread more evenly throughout the combustion chamber.
What does the camshaft do?
The camshaft is a rotating shaft (or shafts) in an engine that activates the intake and exhaust valves for each cylinder. As the shaft turns, cams along its length press down on the spring-loaded valves in synchronicity with the motion of the pistons and firing of the spark plugs.
How an engine works in detail?
The engine consists of a fixed cylinder and a moving piston. The expanding combustion gases push the piston, which in turn rotates the crankshaft. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke.
How many Pistons are in a 4 stroke engine?
four
From motorcycles and cars to lawn mowers and generators, 4-stroke engines power a variety of different kinds of equipment. This type of engine utilizes four distinct piston strokes in order to effectively run.
Who invented 4 stroke engine?
Nicolaus Otto
Four-stroke engine/Inventors
Nikolaus Otto, in full Nikolaus August Otto, (born June 10, 1832, Holzhausen, Nassau, Germany—died January 26, 1891, Cologne), German engineer who developed the four-stroke internal-combustion engine, which offered the first practical alternative to the steam engine as a power source.
What is 4 cycle engine oil?
4-stroke (or 4-cycle) oil is engine oil designed to be used in the crankcase of 4-cycle engines. 2-cycle oil, in contrast, is for mixing in the gasoline to be used in 2-cycle gasoline engines. Since the crankcase of a 2-cycle gas engine acts as a pump, you can’t have it filled with oil like in a 4-cycle engine.