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The simple problem with the two stroke is its almost impossible to prevent some gas from leaking out via the exhaust since the inhalation and exhalation happen
by slededit 8y ago
The simple problem with the two stroke is its almost impossible to prevent some gas from leaking out via the exhaust since the inhalation and exhalation happen simultaneously. Environmental standards are so stringent that this is a non-starter, even though it could achieve much better gas mileage.
Even if you solved that problem you'd still have to burn the oil used for lubrication.
- swimfar 8y agoThere are other options. If you have forced induction and direct injection you fix both those problems. You no longer use the crankcase for pressurizing the intake so the bottom end can be lubricated like a 4-stroke engine instead of adding oil to the fuel. With forced induction you can blow clean air through the ports expelling all the exhaust without wasting any fuel. This obviously adds quite a bit of complexity to the design, though. It may not be economical in the end. And that's assuming you can get it to meet emission regulations.
- anticensor 8y agoUniflow forced-induction directly-injected engines also burn oil. Example of a such 2-stroke engine: https://en.wikipedia.org/wiki/EMD_567 https://en.wikipedia.org/wiki/EMD_567
- cup-of-tea 8y agoI believe that's how diesel two-strokes work. Can it work with petrol? Burning diesel is still undesirable.
- kazinator 8y agoThe diesel cycle as such can work with gasoline, but actual diesel engine implementations not designed for gasoline won't take it very well due to multiple issues. The timing of the injection of diesel is not right for gasoline, and perhaps the compression ratio isn't also. Gasoline is thin and volatile, lacking lubricant properties.
- deleted 8y ago[deleted]