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Headquarters A Mercury 50 HP outboard motor circa 1980 Six cylinder two-stroke engine in 1984. Mercury Marine is a marine engine division of Brunswick Corporation ...
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.
These 59.4 cu in (973 cc) [4] Four 4 cylinder, water-cooled horizontally opposed engines ran on special racing fuel: 82% methanol, 10% toluene or benzol, and 8% castor oil (which was available in 5 US gal (19 L; 4.2 imp gal) cans from drug stores), plus tetraethyllead (also available in drug stores) to avoid engine knock. [4]
They started building inboard 2-cycle marine engines in 1903 in a barn behind the house, along with matching boats. By 1908, they were making V4, V6, V8, and V12 aircraft and marine engines. In 1910, they built the first U.S. monoplane to exhibit their aircraft engines. By 1912, their V-12 was making 180 hp, when disaster struck the factory.
All outboard engines sold in North America by the now-defunct Nissan Marine were rebadged Tohatsus. [ 13 ] Tohatsu four stroke outboard engines above 50 HP sold in North America after 2013 are rebadged Honda, though at some point after that Tohatsu introduced their own 60 HP model which is an up-rated variant of their 40/50 HP engine.
The company's most innovative engine appeared in 1958. The first mass-produced die-cast aluminum engine, it was a four-cylinder, 50 horsepower outboard, completely manufactured by OMC, its V-blocks came from Johnson, its steel parts from Evinrude, while the Gale division contributed its carburetors and ignition systems.
For example, Concorde cruised at 1354 mph, or 7.15 million feet per hour, with its engines giving an SFC of 1.195 lb/(lbf·h) (see below); this means the engines transferred 5.98 million foot pounds per pound of fuel (17.9 MJ/kg), equivalent to an SFC of 0.50 lb/(lbf·h) for a subsonic aircraft flying at 570 mph, which would be better than even ...
For example, a reciprocating engine achieves maximum efficiency when the intake air is unthrottled and the engine is running near its peak torque. The efficiency often reported for a particular engine, however, is not its maximum efficiency but a fuel economy cycle statistical average. For example, the cycle average value of BSFC for a gasoline ...
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