Technician A says the air/fuel ratio of a GDI (gasoline direct injection)engine can be as high as 60 to 1. Technician B says because the air/fuel ratios are so lean, GDI engines require lower compression ratios to prevent detonation. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because GDI engines can indeed operate at very high air/fuel ratios, especially during certain operating conditions such as cruising, where efficiency is maximized. However, Technician B is incorrect because GDI engines typically use higher compression ratios compared to traditional port injection engines to improve efficiency and performance. The direct injection of fuel into the combustion chamber allows for more precise control of the air/fuel mixture and timing, which helps in preventing detonation even with higher compression ratios.

Technician a Says the Air/fuel Ratio of a GDI (Gasoline