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Mount Vernon, WA | I have no doubt that a turboed 2-stroke does better than an NA (or, more accurately, a supercharged-only) 2-stroke, but everything else being equal, a 4-stroke will always outperform a 2-stroke when it comes to fuel efficiency, for the simple fact that a 4-stroke allows more time (in crank angle degrees) on the power stroke to take advantage of more of the heat stroke. By the time a 2-stroke piston is halfway down the bore on the power stroke, the intake ports are exposed.
Emissions are another big problem with a 2-stroke, and that is one reason the series 60 came out when it did (1987), because the government was not fond of the 2-stroke's emissions, even back then.
The only thing a 2-stroke has over a 4-stroke is HP/weight ratio. | |
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Deutz Air Cooled Irrigation Engines ?
