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.
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.
No, we’re on the same page you just haven’t read enough of it. The very article you linked says Otto engines can reach 30% efficiency. It also touches on other 4-stroke engine cycles.
No matter the advances, the Otto cycle will always be 25% efficient, at most.
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.
Are they not four-stroke?
All Otto cycle are 4-stroke but not all 4-stroke are Otto cycle.
Such as Wankels, ok, just replace “Otto cycle” with 4-stroke in my original comment.
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.
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.
No, we’re on the same page you just haven’t read enough of it. The very article you linked says Otto engines can reach 30% efficiency. It also touches on other 4-stroke engine cycles.
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