What is the difference between a diesel and a petrol engine?

What Is the Difference Between a Diesel and a Gasoline Engine?

You have your eye on a stylish but rough new vehicle and you’ve found you have the choice of either a diesel or gasoline (petrol) engine. On the off chance that you don’t understand the difference, you may not know which one to pick.

More alike than different

In truth, a petrol and diesel engine are more alike than different. Both of them work on internal combustion principle, which converts fuel into energy through little ignitions or blasts. Fuel and air are mixed and compressed in both types of engines by the force of a piston in a cylinder. The fuel must ignite to give the force needed for the engine, which then pushes the piston down the cylinder, which inturn turns the wheels (through crankshaft and gears).

How they are different

The difference between diesel and petrol engines is the way the  light the fuel. In a petrol engine, fuel and air are mixed together in the cylinder by a piston, to reach the spark plug. The fuel-air mixture is compressed to about 1/10th its volume, thus increasing the temperature of the mixture. The spark plug then ignites the mixture, driving the cylinder down and turning the crankshaft to control the transmission and turn the wheels.

In a diesel engine, air is allowed into the cylinder, by the piston upto to 14 to 25 times its volume. Fuel is injected from an electronic fuel-injectionsystem, into this hot and highly compressed air to ignite and cause a small explosion. This explosion pushes the piston down and thus turns the wheel similar to a petrol engine. The basic principle remains the same in both the engines, but a spark plug is used in one and Fuel-injector in the other.

Another evident difference is in the kind of fuel utilized in the two engines. Because of the working principles as explained above, lower amounts of diesel is needed to generate the same amount of power as compared to a petrol engine. This is because in apetrol engine, the fuel and air mixture is compressed, which consumes more fuel.

Horsepower and torque is another area where these two engines differ, and it might be the most important for your comparison purposes. Diesel engines have a larger amount of torque, which is the thing that gets the vehicle moving, particularly with heavy loads. Gas motors are better at strength, which rev up higher.

Both types of engines differ in performance in view of the manufacturer and exact specifications, so it’s best to compare specs on the engine when you’re choosing which vehicle to purchase.

credits: yourmechanic.com

 

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