Multiple Valve Engines Tend to Be More Efficient Than Engines

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

Correct Answer:

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