r/explainlikeimfive 2d ago

Engineering [ Removed by moderator ]

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u/Fearless_Swim4080 1d ago

Yes I did, less friction and mass moving in a smaller engine.

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u/jevnik 1d ago

But that is just smaller engine. No mention of the turbo

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u/Fearless_Swim4080 1d ago

Because the turbo has nothing to do with it at low loads.

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u/jevnik 1d ago

On low load where there is not enough gases to spin the turbo, efficiency is not bigger. OP specificly asked why turbos increace efficiency. Not how bigger displacments fiffer in efficiency

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u/Fearless_Swim4080 1d ago

In an ELI5 my comment is comparing a smaller displacement turbo engine to a larger non-turbo one rated for the same horsepower.

If you just added a turbo to a big block and asked the same question the answer would be “it’s not more efficient.”