There are two main types of engines in vehicles. These engines are diesel and petrol. There are some big differences between the two engines. In this video, you will learn about these differences.

Both engines use a four stroke cycle. This involves suction, compression, power, and exhaust.

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The difference lies in how the fuel is ignited. Diesel engines don’t need a sparkplug to ignite the fuel because of the self ignition temperature. The high levels of compression naturally ignite the fuel in diesel engines. This is because they have higher compression ratios. This is measured in the ratio of volume when uncompressed versus the volume when compressed. This compression ratio also allows diesel engine to provide more torque at lower rpms. However, you may also need more diesel engine repairs.

Diesel engines are more fuel efficient than petrol engines. This is because diesel fuel has more hydrocarbons in its molecular structure compared to petrol. This means that more energy is stored. In fact, approximately 15% more energy is stored in diesel. In other measurements, diesel carries 36.9 megajoules of energy while petrol carries 33.7 megajoules.