Power and Performance II Practice Test

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Under a cold air induction system, horsepower increases by 1% for every 10º drop in intake air temperature. How much horsepower increase would result from a 20º drop in a 400 hp engine?

4 hp

16 hp

20 hp

8 hp

A 20º drop equals two increments of 10º, and the system adds 1% horsepower for each 10º drop. So the total boost is 2% of the engine’s baseline horsepower. 2% of 400 hp is 0.02 × 400 = 8 hp.

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