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Four-stroke outboards have been sold since the late 1920s, such as the Roness and Sharland. In 1962 Homelite introduced a four-stroke outboard a 55-horsepower (41 kW) motor, based on the four-cylinder Crosley automobile engine. This outboard was called the Bearcat and was later purchased by Fischer-Pierce, the makers of Boston Whaler, for use ...
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.
"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.
[3] [4] At the time, the lack of vibration from the V4 engine was a key selling point. [5] However, the car's V4 engine was replaced by a conventional inline-four engine by 1901. In the 1907 French Grand Prix, the car entered by J. Walter Christie used a 19,891 cc (1,214 cu in) V4 engine, the largest engine ever used in a Grand Prix race. [6]
In 1967 a new larger displacement model was added to the range, the 350cc two stroke twin R-1. In 1968, Yamaha launched their first four-stroke motorcycle, the XS-1/650 which was a 650cc four-stroke twin, a larger and more powerful machine that equaled the displacement and performance of the popular British bikes of the era, such as the Triumph ...
Outboard Marine: Marine engines from 50–400 PS ... Yamaha Motor Company: ... A four-stroke cylinder produces a power stroke only every other rotation of the ...
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