Why is spark plug used in petrol engine?

Spark plugs are used in the petrol engines to ignite the air fuel mixture whereas in diesel engines the presence of spark plugs is not necessary. Technically petrol engines are called as spark ignition engines ( SI ) and diesel engines are called as compression ignition engines (CI ) .

Why is petrol more flammable than diesel?

The quick evaporation of gasoline quickly cools the hot surface. Combined with the higher autoignition temperature, this means that liquid gasoline is more difficult to ignite than diesel. Diesel aerosol can be much more easily compression ignited in an engine.

Why is petrol more volatile than diesel?

Petrol is more volatile than diesel, due partly to the additives mixed in the petrol. Diesel is heavier and more viscous (thicker) than petrol. Petrol can evaporate, while Diesel doesn’t.

Why the spark plug is not used in diesel engine?

Instead, diesels have a compression ignition and glow plugs that heat the combustion chamber to aid ignition if a diesel engine is cold. A spark plug has no use with diesel fuel because there is no need to ‘light’ the diesel fuel. Instead, the glow plug only heats the combustion chamber.”

How is the fuel ignited in a diesel engine?

Injected fuel is ignited by its reaction to compressed hot air in the cylinder, a more efficient process than that of the spark-ignition internal-combustion engine. The diesel engine gains its energy by burning fuel injected or sprayed into the compressed, hot air charge within the cylinder.

What happens if diesel used in petrol engine?

Here’s what happens when you put diesel in a petrol car: Petrol ignites by a spark from the spark plugs. Diesel in a petrol engine clogs up the spark plugs and fuel system. That means the car simply won’t start.

What happens if diesel engine is filled with petrol?

Filling up your diesel car with petrol will damage your fuel injection system and put enormous amounts of pressure onto your car’s engine. In severe cases, filling up a diesel engine with petrol will cause your vehicle to detonate due to an uninhibited ignition of fuel.

Why does petrol vaporize faster than diesel in ignition?

No doubt, volatility of Petrol is higher than Diesel that’s why petrol vaporizes fast. As we know, diesel is used in CI Engine (compression ignition engine) and Petrol is used in SI Engine (spark ignition engine). In SI Engine, less temperature is required for ignition because petrol has less flash point.

Why is diesel fuel more viscous than petrol?

Due to the fact that diesel fuel is heavier due to its chemical composition, it is more viscous than petrol. The viscosity of diesel increases a lower temperature, thus making it susceptible to gelling and may hamper the operation of diesel engines at frigid weather. It also boils between 250 to 350 degrees Celsius.

Why don’t we use petrol in diesel engines?

Since petrol has a lower flash point, it does not make sense to utilize resources and money to compress the fuel in order to burn it; the same function is done by the spark plug. For diesel, the spark plug will not ignite the fuel easily, which is why diesel is compressed and forced to auto-ignite.

Why is the flash point of diesel greater than petrol?

Flash point of Diesel is greater than Petrol. No doubt, volatility of Petrol is higher than Diesel that’s why petrol vaporizes fast. As we know, diesel is used in CI Engine (compression ignition engine) and Petrol is used in SI Engine (spark ignition engine).