Multiple valve engines tend to be more efficient than engines with two valves per cylinder because:
A) larger valve area improves the air flow in and out of the cylinder
B) air velocity is increased-especially at low engine speed; this increases air flow
C) smaller and lighter valves require less spring tension-less engine power is lost to spring opening drag
D) all answers are correct

Question

Quizplus · Accepted Answer

Multiple valve engines improve efficiency by increasing valve area for better airflow, enhancing air velocity at low speeds, and using smaller, lighter valves that reduce power loss.

Multiple Valve Engines Tend to Be More Efficient Than Engines