🔍 Key Concepts

• Turbocharging / supercharging effects on diesel engine performance • Relationship between air-fuel ratio and specific fuel consumption • What happens to combustion pressure and exhaust flow when more air is supplied

💭 Think About

• If you increase air inlet manifold pressure, what happens to the amount of oxygen available for combustion and how can that affect efficiency? • How would better combustion (more complete burning of fuel) likely affect the fuel required per horsepower-hour? • When more air is pushed into the cylinders, what is the logical effect on maximum cylinder pressure and exhaust manifold pressure?

✅ Before You Answer

• Compare which options indicate improved efficiency versus reduced efficiency • Decide whether increased air pressure in the intake is likely to raise or lower peak cylinder pressure • Think about whether more intake air generally results in higher or lower exhaust back pressure for the same power output