THE DIESEL ENGINE Internal combustion engine that runs on 1. → compression 2. principle.
There are two types of diesel engines, according to the number of strokes used to complete an engine cycle.
Two-stroke diesel engines: power once every 3. of crankshaft → fresh air in 4. → piston compresses air → diesel fuel added → catches 5. → piston down Four-stroke diesel engines: power every two 6. → less fuel → lasts 7.
Pros of diesel engines: • more 8. • less fuel needed • very 9.
Cons of diesel engines: • heavier and 10. • less 11. to drive • slower in 12.
8.1 Read the text, then decide which engine the feature belong to.
Diesel vs Petrol Engines Diesel and petrol engines differ in several key features. In terms of fuel efficiency, diesel engines are more efficient, especially for long-distance driving, while petrol engines are generally less efficient, although modern petrol engines have improved significantly. When it comes to power output, diesel engines produce higher torque, making them better for heavy loads and strong acceleration, whereas petrol engines offer higher horsepower, allowing for higher speeds. Regarding emissions, diesel engines used to produce high levels of particulate matter and nitrogen oxides, but advances in technology have greatly reduced these emissions. Petrol engines have lower emissions compared to older diesel models, though they tend to release more carbon dioxide (CO2). In terms of maintenance costs, diesel engines have more complex components and require higher-quality fluids, making maintenance more expensive, while petrol engines are simpler and have lower overall maintenance costs.