While having a discussion about valves, Technician A says that higher compression is possible with the L-head. Technician B says that higher compression is achieved with the I-head because, unlike the L-head, the combustion chamber does not need extra volume to accommodate the valves. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question

Quizplus · Accepted Answer

Technician B is correct because in the I-head engine, the valves are positioned above the combustion chamber, which means that there is no need for extra volume to accommodate the valves. This results in a smaller combustion chamber and a higher compression ratio. In contrast, the L-head engine has valves that are located in the engine block next to the piston. This requires a larger combustion chamber to create space for air/fuel mixture to enter and exhaust gases to exit, which limits the maximum compression ratio that can be achieved.

While Having a Discussion About Valves, Technician a Says That