an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke
(Otomotiv) The most common internal combustion engine process. It refers to the distinct movements of the piston that draw fuel/air mixture into the combustion chamber (intake stroke), compress the mixture (compression stroke), transmit the power created by the combustion to the crankshaft (power stroke), and expel the exhaust gases from the cylinder (exhaust stroke)