🔍 Key Concepts

• Turbocharging effects on air supply and combustion in diesel engines • Relationship between air mass, fuel burning efficiency, and power output • How brake specific fuel consumption (BSFC) and mechanical efficiency normally change when an engine is turbocharged

💭 Think About

• When you add a turbocharger to a naturally aspirated engine, what happens to the amount of air entering the cylinders and the completeness of combustion? • Think about whether turbocharging usually makes an engine use more fuel per unit power, or less fuel per unit power, and why. • Consider which parameters (ignition lag, lube oil pressure, BSFC, mechanical efficiency) are directly influenced by higher inlet air pressure and better scavenging, and which are mostly independent of turbocharging.

✅ Before You Answer

• Be clear on the definition of brake specific fuel consumption (BSFC): fuel used per unit brake power per hour. • Recall what mechanical efficiency represents: ratio of brake power to indicated power. • Ask: does turbocharging mainly affect combustion and output, or does it directly control lube oil pressure or ignition delay?