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This text dated 1981 mentions it (page viii): https://link.springer.com/content/pdf/bfm%3A978-1-349-06976-7%2F1.pdf https://link.springer.com/content/pdf/bfm%3A

by pen2l 6y ago

This text dated 1981 mentions it (page viii): https://link.springer.com/content/pdf/bfm%3A978-1-349-06976-7%2F1.pdf https://link.springer.com/content/pdf/bfm%3A978-1-349-06976-... edit: and googling some more, there are instances of in being used it 1950s. And the likely first author of the saying might well be the inventor of the 4 stroke engine himself, Nicolaus Otto, who used a similar saying to describe it: Saugen, Drücken, Knall, Schlag.

wizzwizz4 6y ago
Only source I can find for your last claim is https://mechanics.stackexchange.com/a/28690/33924 https://mechanics.stackexchange.com/a/28690/33924: > Actually, I wouldn't be surprised if the great Nikolaus August Otto, inventor of the four-cycle engine had a similar saying to explain his engine: Saugen, Drücken, Knall, Schlag... So I think this is apocryphal.
- pen2l 6y ago
  You might be right, I'm not sure. At least in Otto's patent filing (which is found in English here: https://patentimages.storage.googleapis.com/1f/3f/4c/821c6da1070930/US194047.pdf https://patentimages.storage.googleapis.com/1f/3f/4c/821c6da... ) I don't see such an expression. I do see though that the breakdown of the Otto cycle on most sites including German ones (https://de.wikipedia.org/wiki/Ottomotor https://de.wikipedia.org/wiki/Ottomotor) is usually made in a way that just sorts of lends itself to being transformed that way. Well, thanks for making me go through his writings, this was fun!