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Headquarters A Mercury 50 HP outboard motor circa 1980 Six cylinder two-stroke engine in 1984. Mercury Marine is a ... (20 hp) and the Mark 55 (40 hp), Mercury ...
They are the second largest producer of outboard motors in the world and produce environmentally conscious TLDI series of two-stroke low pressure direct injection outboards that meet current United States Environmental Protection Agency regulations for the US. Mercury outboards from 30 hp and below are rebadged Tohatsus and all Nissan outboard ...
Mercury Marine, Mercury Racing, Tohatsu, Yamaha Marine, Nissan and Evinrude each developed computer-controlled direct-injected two-stroke engines. Each brand boasts a different method of DI. Fuel economy on both direct-injected and four-stroke outboards measures from a 10 percent to 80 percent improvement compared with conventional two-strokes.
"Compared to a similar 2004 four-stroke engine, carbon monoxide emissions with Evinrude E-TEC are typically 30 to 50 percent lower; and at idle are lower by a factor of 50 to 100 times. In addition, Evinrude E-TEC emits 30 to 40 percent less total particulate matter on a weight basis than a similar “ultra-low emissions” four-stroke outboard.
Two-stroke engines often have a higher power-to-weight ratio than a four-stroke engine, since their power stroke occurs twice as often. Two-stroke engines can also have fewer moving parts, and thus be cheaper to manufacture and weigh less. In countries and regions with stringent emissions regulation, two-stroke engines have been phased out in ...
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