Technician A says compression ratio is based only on the distance the piston moves from BDC to TDC. Technician B says increasing the compression ratio of an engine can lead to detonation. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician B is correct. Increasing the compression ratio in an engine can lead to detonation due to the higher pressure and temperature inside the combustion chamber, which can cause the air/fuel mixture to ignite before the spark plug fires. Technician A is incorrect, as compression ratio also takes into account the volume of the combustion chamber when the piston is at the bottom of its stroke (BDC).

Technician a Says Compression Ratio Is Based Only on the Distance