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What does combustion look like?

Ever wondered what happens inside your engine when the fuel meets the spark and what it looks like? We all drive them and just expect the power to come when you press the right pedal.

Well wonder no more, as someone has taken the time to fit a clear cylinder head and film it in 4K Slo-mo. The simple, single cylinder, 4-stoke engine provides the necessary Suck, Squeeze, Bang and Blow and it looks beautiful.

For those who don’t know, a four-stroke engine is an engine in which the piston completes four separate strokes while turning a crankshaft. A stroke refers to the full travel of the piston in the cylinder, in either direction. The four separate strokes are termed:

Suck = Intake: also known as induction or suction This stroke of the piston begins at top dead center (T.D.C.) and ends at bottom dead center (B.D.C.). In this stroke the intake valve must be in the open position while the piston pulls an air-fuel mixture into the cylinder by producing vacuum pressure into the cylinder through its downward motion.

Squeeze = Compression: This stroke begins at B.D.C, or just at the end of the suction stroke, and ends at T.D.C. In this stroke the piston compresses the air-fuel mixture in preparation for ignition during the power stroke (below). Both the intake and exhaust valves are closed during this stage.

Bang = Combustion: also known as power or ignition This is the start of the second revolution of the four stroke cycle. At this point the crankshaft has completed a full 360 degree revolution. While the piston is at T.D.C. (the end of the compression stroke) the compressed air-fuel mixture is ignited by a spark plug (in a gasoline engine) or by heat generated by high compression (diesel engines), forcefully returning the piston to B.D.C. This stroke produces mechanical work from the engine to turn the crankshaft.

Blow = Exhaust: also known as outlet. During the exhaust stroke, the piston once again returns from B.D.C. to T.D.C. while the exhaust valve is open. This action expels the spent air-fuel mixture through the exhaust valve.

Combustion