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Sport Pilot wrote:
> > Don Stauffer wrote: > >>Sport Pilot wrote: >> >>>Completely wrong, the Otto cycle has nothing to do with four stroke >>>engines. Don is right its not four cycle, I used it incorrectly. The >>>Otto and Diesel cycles are actually refering to the thermodynamics >>>chart of temperature pressure and volume, they invented their cycles on >>>paper and books, the engines we use are only close approximations. The >>>two stroke ignition engine uses the Otto cycle as it is has the four >>>phases of intake, compression, power, and exhaust, and the pressure is >>>not constant. The Diesel two stroke is a Diesel cycle because it also >>>includes the same phases and the fuel burns at a fairly constant >>>pressure. >>> >> >>I guess I'd quibble with the statement that the Otto cycle has nothing >>to do with four-stroke engines- it was the first successful cycle to >>incorporate four strokes. yes, there are other four stroke cycles, but >>the Otto cycle is still by far the most common. There have been several >>other four-strokes, several two-strokes, at least on six stroke- I >>suspect several also. >> >>New IC engine designs are among the most numerous US patents. Just >>because something is patentable, of course, does not make it good or >>successful, and most of these patents were for approaches that offered >>insufficient advantages. >> >>BTW, as I understand the new Miller cycle, I don't consider it a truly >>new cycle- just a clever mod on the Otto. I don't consider the Otto >>cycle to require valve openings at closings at the top or bottom dead >>center, exactly. > > > The confusion is that Otto invented the first four stroke engine and > called it the Otto cycle, not because of thermodynamics but because he > put it in a motorcycle. However the thermodynamic cycle can be > reproduced with a two stroke engine. Its just that the intake and > exhaust cycle's are much shorter. > I am not sure what you mean by exhaust and intake "cycles". There is one cycle- the actions that the engine goes through before everything repeats. Do you mean the portions of the cycle during which the exhaust and intake take place- they definitely take less crankcase revolution angle. In the Otto cycle it is easy to break it down into four operations, each lasting one stroke. A two-stroke is more complicated, because it still has (existing, contemporary ones, do anyway) four seperate functions of intake, compression, combustion and exhaust, but have to do it in two strokes. |
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