You know what it looks like… but what is it called?
TAKE THE QUIZ“two stroke”
We have one entry that includes the term two stroke.
two-stroke cycle
noun: a working cycle of a piston in an internal combustion engine consisting of two strokes in which the piston during the first stroke compresses the fuel mixture on one side while receiving the expansive thrust of previously compressed gases on the other side and during the second draws in a fresh charge on one side while expelling burnt gases on the other compare four-stroke cycle
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Merriam-Webster unabridged