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Yamaha started development of the OX66 in 1984 [1] as a design concept for a lightweight and compact Formula Two engine with a wide power band.. At the time of development, both BMW and Honda provided engines for F2 (in the form of the M12/7 inline-four and the RA260E V6 respectively), but Honda's engine yielded superior results despite limited use.
Outboard motor shaft lengths are standardized to fit 15-, 20- and 25-inch (38-, 51- and 64-centimeter) transoms. If the shaft is too long it will extend farther into the water than necessary creating drag, which will impair performance and fuel economy. If the shaft is too short, the motor will be prone to ventilation.
The power stroke begins after the air-fuel mixture is ignited. The burnt fuel creates pressure in the cylinder above the piston and forces it downward. As the piston passes the midpoint of the downstroke, the exhaust port to the side of the cylinder is uncovered and initiates the flow of burned fuel into the expansion chamber or muffler.
Instead of the V-Boost on the original carbureted V-Max, the fuel injected VMAX uses YCC-I and YCC-T. Yamaha Chip Controlled Intake (YCC-I) is a new addition to the VMAX. The airhorns inside the airbox are lifted by a servo activated at 6,650 rpm to open up the airway underneath. This shortens the length of the intake system from 150 mm to 52 mm.
Outboard Marine Corporation sometimes referred to as Outboard Motor Company was formed in 1929 when ELTO was merged with Lockwood-Ash Motor Company. They began using the name OMC in 1956. Outboard Marine Corporation was the world's largest manufacturer and supplier of outboard motors and second largest producer of powerboats.
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The fresh air and most of the leftover fuel and exhaust leave the cylinder. Anil claims that this creates a fresher atmosphere inside the cylinder before the next air-fuel intake stroke, helps the engine to burn almost 100% of the air-fuel mixture, and reduces harmful emissions (including a 98% reduction in carbon monoxide emissions).
Cylinder head of Honda K20Z3.This engine uses continuously variable timing for the inlet valves. Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions.
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