Well, so much for scientific research in Antarctica…it’s about to be a war zone.

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[–] 1 point 11 months ago (8 children)

No matter the advances, the Otto cycle will always be 25% efficient, at most.

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  • [–] 0 points 11 months ago (7 children)

    Last I heard modern gas engines have reached a smidge over 30% thermal efficiency because the pure Otto cycle hasn't been used in decades. Mazda(?) recently announced an engine over 40% efficiency using an Atkinson design I think. Superchargers and more Turbochargers boost efficiency more by recycling waste energy.

    But I'm not sure any of that matters because diesels aren't Otto Cycle.

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  • [–] 1 point 11 months ago (6 children)

    diesels aren’t Otto Cycle.

    Are they not four-stroke?

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  • [–] 1 point 11 months ago (5 children)

    All Otto cycle are 4-stroke but not all 4-stroke are Otto cycle.

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  • [–] 1 point 11 months ago (4 children)

    Such as Wankels, ok, just replace "Otto cycle" with 4-stroke in my original comment.

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  • [–] 1 point 11 months ago (3 children)

    Then your original comment is still wrong, because diesel engines are significantly more thermally efficient than 25%. Even modern gas engines tend to beat your 25% claim.

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  • [–] 1 point 11 months ago (2 children)

    I guess we're not on the same page on what a four-stroke engine is, as only one "stroke" of four is doing actual mechanical work.

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