1. Engine Complexity: Diesel engines are generally more complex in terms of design and engineering compared to petrol engines. This complexity stems from the higher compression ratios and fuel injection systems used in diesel engines to achieve efficient combustion.
2. Manufacturing Cost: The production process for diesel engines involves more precise engineering and utilizes more robust materials to withstand the higher combustion pressures and temperatures. These factors lead to increased manufacturing costs.
3. Emission Control Systems: Diesel engines produce more particulate matter (soot) and nitrogen oxides (NOx) compared to petrol engines. To comply with stringent emission standards, diesel vehicles require additional emission control systems, such as diesel particulate filters (DPFs) and selective catalytic reduction (SCR) systems. These emission control systems add to the overall cost of manufacturing.
4. Turbocharging: Diesel engines often employ turbochargers or superchargers to improve performance and efficiency. These systems add complexity and cost to the engine setup.
5. Research and Development: The development of advanced diesel technologies such as common-rail fuel injection systems, advanced turbocharging, and emission control systems requires significant investment in research and development. These costs are reflected in the higher price tag of diesel cars.
6. Demand and Market: The market share of diesel vehicles varies depending on the region, fuel prices, and consumer preferences. In countries where diesel fuel is comparatively cheaper or where diesel vehicles are widely adopted (such as Europe), the price difference may be less significant. However, in regions where petrol vehicles are more prevalent, diesel cars can be relatively costlier due to lower demand and economies of scale.
Overall, the combination of these factors contributes to the cost difference between diesel and petrol vehicles, making diesel cars generally more expensive than their petrol counterparts.
