The volumetric efficiency of the SI engine is comparatively
A)lower than CI engine
B)higher than CI engine
C)will be same as CI engine
D)none of the above

Question

Quizplus · Accepted Answer

The volumetric efficiency of the SI (Spark Ignition) engine is generally lower than that of the CI (Compression Ignition) engine because SI engines are typically naturally aspirated and have to deal with intake charge throttling, which reduces the amount of air-fuel mixture that can be taken in during the intake stroke. CI engines, on the other hand, often use turbocharging or supercharging, which increases the mass of air entering the cylinders, thus improving volumetric efficiency.

The Volumetric Efficiency of the SI Engine Is Comparatively