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In the four-stroke cycle the first down stroke sucks air into the piston, which is compressed by the up stroke.
Whether two stroke cycle (2SC) or four-stroke cycle (4SC), all engines must intake fresh air charge, purge spent gases and then intake another fresh air charge.
Lauderdale International Boat Show, Detroit Diesel Corporation (DDC) introduced the DDC/MTU 8V2000 engine, the latest member of a new series of high performance, four-stroke cycle marine diesel engines.