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Does engine size affect speed of car?

Updated: 4/28/2022
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10y ago

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Kinda-sorta.

The speed is ultimately dependent on the power rating, horsepower/kW - not the size as such. You can have a big and inefficient engine that puts out a lot less than a small and highly tuned engine.

An engine's power is determined by two factors, the turning force the engine can create and how fast it can spin for a given amount of turning force.

To get good speed you need a bit of both. Amazing turning power but only one turn/minute wouldn't work particularly well. Nor would an engine that'd spin like crazy but very weakly.

Generally, bigger engines are better at turning force and poorer on spin, while smaller engines are better at spin but poorer at turning force.

Now, obviously there are things you can do with gear boxes, to turn slow and strong into fast and a bit weaker, or fast and weak into slower and stronger.

But usually, for two engines built to the same degree of tuning, the bigger engine should have more power and be able to provide more speed.

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