Why do 4-stroke engines need something to actuate the intake valve?

Why do 4-stroke engines need something to actuate the intake valve?

Consider a hit-and-miss engine. There's no external mechanism (like a cam) to actuate the intake valve. It's held closed by a light spring, and when the cylinder begins its intake stroke, the low pressure pulls the intake valve open.

Why then does a standard 4-stroke N/A engine need something to actuate the intake valve?

Submitted June 19, 2017 at 09:15PM by metrogdor22
via reddit http://ift.tt/2sMAhBY

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Why do 4-stroke engines need something to actuate the intake valve?

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