Technician A says the effective compression ratio is determined by the point at which the intake valve closes. Technician B says effective compression ratio and static compression ratio are synonymous terms. Who is correct?
A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question

Quizplus · Accepted Answer

Technician A is correct because the effective (or dynamic) compression ratio is indeed influenced by the point at which the intake valve closes, as this affects how much air-fuel mixture is actually compressed in the cylinder. Technician B is incorrect because the effective compression ratio, which takes into account valve timing, is different from the static compression ratio, which is a fixed value determined by the engine's design.

Technician a Says the Effective Compression Ratio Is Determined by the Point