Higher Compression Ratio: Diesel engines typically have a higher compression ratio compared to petrol engines. This higher compression ratio results in more efficient combustion and a more significant pressure increase during the power stroke, leading to increased torque.
Fuel Characteristics: Diesel fuel has a higher energy density than petrol. This means that more energy is released when a given volume of diesel is burned compared to petrol. This energy advantage contributes to the higher torque output of diesel engines.
Combustion Process: Diesel engines operate on the principle of compression ignition, where the heat generated by compressing the air is sufficient to ignite the fuel. This spontaneous combustion allows diesel engines to burn the fuel more efficiently and produce more torque at lower RPMs.
Fuel Injection System: Diesel engines commonly use fuel injection systems that provide precise control over the fuel delivery. This allows for more efficient and optimized combustion, resulting in increased torque output.
Turbochargers and Superchargers: Diesel engines often utilize turbochargers or superchargers to increase the air density during combustion. This forced induction improves the engine's efficiency and contributes to higher torque production.
Overall, the combination of higher compression ratios, fuel characteristics, efficient combustion, and advanced fuel injection systems makes diesel engines capable of generating more torque than petrol engines. However, it's worth noting that this torque advantage comes with certain trade-offs, such as increased engine noise and vibrations compared to petrol engines.
