Eli5: why are car engines never an even number? E.g a 3L engine is always 2967, a 2L is 1984 etc.. why???

Question

Eli5: why are car engines never an even number? E.g a 3L engine is always 2967, a 2L is 1984 etc.. why???

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Answer 1

I got quite confused by the example of a 2L, 1984cc engine not being an “even number” before I read the comments and realised what you were talking about.