One Stroke Engine: The Efficiency and Elimination of 2 and 4 Stroke Designs

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Discussion Overview

The discussion revolves around the concept of a one-stroke engine design that could potentially eliminate the need for traditional two-stroke and four-stroke engines. Participants explore the feasibility, mechanics, and implications of such a design, touching on theoretical aspects and practical considerations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose a two-way port system that opens for air and fuel intake and closes during combustion, suggesting this could eliminate the need for multi-stroke designs.
  • Others question the timing of intake, compression, combustion, and exhaust in a single cycle, seeking clarification on how these processes would work together.
  • A participant mentions that a flat twin engine could achieve a power stroke every 180°, implying a potential design that could incorporate the one-stroke concept.
  • Jet engines are referenced as having a different operational cycle, with some participants noting that pulsejet engines also have a cyclical operation.
  • Concerns are raised about the practicality of a one-stroke engine for personal transport, citing potential messiness and inefficiency.
  • Some participants argue that a one-stroke engine would not return to its starting position, emphasizing that strokes must be multiples of two in traditional designs.
  • There is a discussion about the necessity of the compression/burn cycle in maintaining efficiency and reducing emissions, suggesting that omitting these phases could be detrimental.
  • One participant suggests incorporating a flywheel mechanism to theoretically allow a one-stroke engine to function, comparing it to riding a bike with one pedal.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the feasibility and mechanics of a one-stroke engine design. There is no consensus on whether such a design could effectively replace traditional engines or how it would operate in practice.

Contextual Notes

Participants highlight limitations in the original proposal, including vagueness in the description of the one-stroke engine and the need for more detailed explanations of the proposed mechanics.

Thomasprice
Why can't u make two way port opens when it sucks in air and fuel but closes when combustion happens eliminating 2 stroke and even 4 stroke design
 
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You may want to expand on your idea. Exactly when would intake, compression, combustion, and exhaust happen in a single cycle?
 
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A flat twin would do the job - see Citroen 2CV. But each half would need to be a two stroke. That would give you a power stroke every 180°.
 
Thomasprice said:
Why can't u make two way port opens when it sucks in air and fuel but closes when combustion happens eliminating 2 stroke and even 4 stroke design
Jet engines do that.
 
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Not great for personal transport ( like a car} though, messy for anyone else wanting to drive the same route.
 
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Thomasprice said:
Why can't u make two way port opens when it sucks in air and fuel but closes when combustion happens eliminating 2 stroke and even 4 stroke design
A one stroke engine would never return to where it started. The shaft would rotate 180 degrees and then stop. The strokes have to be multiples of 2.

In any case, your idea is too vague to critique further and as others said, you'll need to describe it in more detail.
 
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russ_watters said:
A one stroke engine would never return to where it started.
Absolutely. The 'stroke number' refers to a reciprocating engine. A Wankel Engine, although it doesn't actually have a crank and reciprocating piston etc., still goes through four strokes on the way round. The two stroke engine still has the four functions of induction, compression, ignition and exhaust, and each 'stroke' involves two functions.
 
Classic designs wouldn't work, but if you incorporated some kind of "flywheel" that gets accelerated on the downstroke and whose inertia would carry it through the upstroke, I don't see why that couldn't work at least theoretically. It would be like riding a bike but only ever pushing on one of the pedals, which obviously works as I've done it many times.
 
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rumborak said:
Classic designs wouldn't work, but if you incorporated some kind of "flywheel" that gets accelerated on the downstroke and whose inertia would carry it through the upstroke, I don't see why that couldn't work at least theoretically. It would be like riding a bike but only ever pushing on one of the pedals, which obviously works as I've done it many times.
That is how the classic designs work. I suspect the OP is confused about what happens and needs to happen during the strokes.
 
  • #11
The fundamental phases that add a second stroke to the intake/exhaust cycle is the compression/burn cycle. If you omit those by squeezing them somewhere into one cycle, you almost certainly lose efficiency and increase pollution emissions.
 

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