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In 1984, Yamaha introduced their first four-stroke outboards, which were only available in the low-power range. In 1990 Honda released 35 hp and 45 hp four-stroke models. They continued to lead in the development of four-stroke engines throughout the 1990s as US and European exhaust emissions regulations such as CARB ( California Air Resources ...
This is due in part to a pinpoint oiling system that only applies oil to the necessary components, unlike the original two-stroke motors. Evinrude E-TEC was the first outboard engine technology to win the US Environmental Protection Agency's 2004 Clean Air Excellence Award which recognizes low emission levels. [1]
For example, if the static compression ratio is 10:1, and the dynamic compression ratio is 7.5:1, a useful value for cylinder pressure would be 7.5 1.3 × atmospheric pressure, or 13.7 bar (relative to atmospheric pressure). The two corrections for dynamic compression ratio affect cylinder pressure in opposite directions, but not in equal strength.
They build a full line of four-stroke outboard marine engines. They were the second U.S. company to build a four-stroke marine outboard engine. They manufactured the first marine engine in 1964. Many of the engine concepts and technologies are taken from their automotive engines used in popular vehicles such as the Accord and Odyssey.
Mercury outboards 30 hp and below are manufactured by Tohatsu in Japan. [citation needed] Mercury developed a processor-enhanced line of outboards called the "Verado" outboard engine. [when?] [5] The "Verado" system integrates the outboard into an entire system, including "fly-by-wire" steering and advanced diagnostics. Verado engines are ...
Throughout the design phase of the KKM, Froede's engineering team had to solve problems such as repeated bearing seizures, the oil flow inside the engine, and the engine cooling. [19] The first fully functioning KKM engine, the KKM 125, weighing in at only 17 kg (37.5 lb) displaced 125 cm 3 and produced 26 PS (19 kW) at 11,000 rpm. [ 20 ]
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