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This wikipedia article mentions six-stroke engine concepts which add a water-injection and a steam-expelling stroke to the common four-stroke-cycle. At first glance it reads like a very convincing concept as you allegedly increase efficiency, lower nitrous oxide emissions and can dispense with a separate cooling system. But I am unaware of such a system ever having been deployed.

  • Is this correct or did such an engine ever leave the testing stage?

  • If not, why?

  • Would such a design work equally well with petrol- and diesel-engines?

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    $\begingroup$ Have you plotted the cycle on an H-S diagram or P-V ? maybe worth your effort. $\endgroup$ Commented Oct 19 at 5:33
  • $\begingroup$ your wiki article gives at least one commerically produced example. $\endgroup$ Commented Oct 20 at 14:28
  • $\begingroup$ Really? Note that I am not asking about six-stroke-engines in general. $\endgroup$ Commented Oct 20 at 20:58
  • $\begingroup$ Has it ever left the testing stage? Well, only to limited experimental / prototype levels; no mass-production automotive engine uses this design as far as I know. A study titled “A Highly Efficient Six-Stroke Internal Combustion Engine Cycle with Water Injection for In-Cylinder Exhaust Heat Recovery” (“Conklin & Szybist, 2010”) from the Oak Ridge National Laboratory (ORNL) describes modelling of the concept. ornl.gov/publication/… $\endgroup$ Commented Oct 30 at 17:42

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