Comparison: Petrol engines vs Diesel engines vs Electric Motors

While technology has changed significantly in recent years, the basic structure of an internal combustion engine is the same as it was over a century ago.

Petrol engines are the most popular engine technologies in the world. In contrast, diesel engines are less popular but more torque dense and provide better fuel efficiency. Electric motors are still new to the market and not so efficient as petrol or diesel. Let's discuss everything about these three types of engines in detail with pros and cons.

Petrol engines

Petrol engine cars have come a long way since the first one was built. They are much safer, more efficient, and have many more features than you'd expect. They are comparatively cheaper than diesel engine cars with regards to maintenance cost and are more fuel-efficient and economical in terms of running cost.

However, apart from producing harmful greenhouse gases, they also produce large amounts of nitrogen oxides, which are bad for the environment we live in and human health.

Diesel Engine

You may have heard, a diesel car is a good choice for drivers who want to save money on fuel. Diesel engines are also much more efficient at delivering power and torque than similar gasoline engines.

However, diesel cars do have their disadvantages. They are noisier than petrol cars, and overall they have more vibrations. Many people also feel that diesel engines are loud and clunky.

Diesel cars also tend to be more expensive than their petrol counterparts.

Electric Motors

The benefits of using electric car motors over petrol and diesel engines are obvious, most notably, reduced safety risks, reduced greenhouse emissions and zero air pollution. They are also a lot quieter than petrol or diesel engine cars. They are so quiet that some EV like the Audi e-Tron have an external speaker arrangement that alerts people in its vicinity when the car is in motion.

The disadvantages are electric cars have a shorter range than gas cars and take longer to charge. Also, as of now, they are still more expensive than petrol-powered cars.