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Simple 2-stroke motors were common in motorcycles, motorscooters, and smaller cars for decades before air pollution legislation made most of them impermissible. These crankcase-aspirated type were simpler than 4 strokers without the valve gear and recirculating oil pumps, therefore cheaper to make, but burned the lube along with the fuel, leaving carbon deposits in the motor and smokey noxious effluent in their wake.
A modern closed crankcase forced induction 2 stroke with charging pump and valving can run cleanly with recirculated lube, but are employed for efficiency rather than simplicity and usually of diesel type. The largest engines as used in Freighters and tanker ships are of this type as are many smaller stationary engines.
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Last edited by Pio1980; 11-04-2015 at 11:21 AM.
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