Air Capacity

A 4-stroke cycle engine may or may not have a pressure boost (supercharger, turbocharger) in the intake system. Why must a 2-stroke cycle engine always have an intake pressure boost?

Explain the effect of delayed charging on IC engine volumetric efficiency.

A diesel engine operating on the 4-stroke cycle is to be designed to operate with the following characteristics where the mean conditions are: $1 \text{ bar}$ and $25^\circ\text{C}$, brake power $= 254 \text{ kW}$, volumetric efficiency $= 0.79$, brake specific fuel consumption $= 0.27 \text{ kg/kW.hr}$, air-fuel ratio $= 17:1$, speed $= 1525 \text{ rpm}$. Calculate the required engine capacity and brake mean effective pressure. Heat of combustion of diesel fuel $= 43000 \text{ kJ/kg}$, $R_a = 287 \text{ J/kg.K}$.

Why cooling of IC engine is important?

How unburn hydrocarbon emissions are occurred in SIE?

A diesel engine operating on the 4-stroke cycle is to be designed to operate with the following characteristics where the mean conditions are: 1 bar and $25^{\circ}\text{C}$; brake power 254 kW; volumetric efficiency = 0.77; brake specific fuel consumption = 0.26 kg/(kW.hr); air-fuel ratio = 17:1; speed = 1500 rpm. Calculate the required engine capacity and brake mean effective pressure. Heat of combustion of diesel fuel = 43,000 kJ/kg, $R_a = 287 \text{ J/kg.K}$.

Why gasoline direct injection (GDI) system produces less knock and gives better volumetric efficiency?

What is meant by fuel metering in CI engine? Differentiate between individual pump system and common rail system.

Why the volumetric efficiency of IC engine decreases if the load is increased maintaining the speed constant?