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Because the fuel is ignited by a spark plug rather than by compression as is the case with a diesel.

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Q: Why petrol engine is called spark ignition engine?
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What are the defferences between dessel and petrol engine?

Petrol & Gas engines are spark ignited engines where as diesel engines are compression ignited engines. Petrol engines works with explosion of fuel air mixture due to spark from spark plug inside the cylinder. Diesel engines works with combustion of fuel air mixture due to compression, compressed mixture attains a very high temperature which exceeds the flash point of diesel and starts burning inside the cylinder and the hot gases after burning of fuel misture exerts force on piston which makes the diesel engines work. Diesel engines are highly efficient than petrol engines.


Can you make a diesel engine which works on the basic principle of petrol engine or you can say it uses diesel as a fuel but works on the principle of petrol engine?

No, a diesel is a compression firing engine and a petrol is a spark firing engine. Diesel fuel will not burn in a petrol engine with spark plugs.


Can you use kerosene in petrol engine?

No! Yes! Low performance spark ignition engines in boats and tractors commonly use kerosene as a fuel. Some need to be started on petrol then switched to kerosene.


Why in petrol engine spark plug is used but not in diesel engine?

Diesel engines run much higher compression than petrol engines. The higher compression makes the air in the cylinder so hot that the fuel self ignites. A petrol engine doesn't get warm enough for self ignition, so you have to add a spark from the spark plug to ignite the fuel.


Why compression ratio of petrol enine is 8 where as diesel engine is 22?

because a diesel engine ignites its fuel with pressure, and not with a spark like a petrol engine. that is why a petrol engine does not need as high a compression ratio as a diesel engine

Related questions

How many types of spark ignition engine?

There are basically two types of spark ignition engine. They are the diesel spark engines and the petrol spark engines.


What is spark ignition or Diesel?

spark ignition engine is also known as petrol engine. but in diesel engines the fuel is burnt due to the high compression of air.so there is no need of spark plug


Full form of SI engine?

SI stands for Spark Ignition. eg. Petrol Engine.


How are internal combustion engines?

you cut off the ignition spark in a petrol engine


How are internal combustion engines stopped?

you cut off the ignition spark in a petrol engine


What engine uses a spark plug to ignite a compressed air-gas mixture?

A spark ignition engine, like your average gasoline/petrol burning car engine.


What is spark ignition engine?

A 'spark ignition ' engine is your regular gasoline engine as opposed to a diesel, which is a 'compression ignition' engine


What is the difference between a diesel engine and a petrol engine ignition of mixture?

petrol engine - Fuel and air mixtures together and compressed in engine. These mixtures ignited by Spark plug Diesel Engine - Air only compressed at high pressure and Temperature. Fuel injected at high temp so that the ignition takes place


Does an mpfi engine replace spark plug?

No. Spark plugs remain in Petrol engines. MPFI stands for Multi Point Fuel Injection, thus replacing the carburetor with injectors. Petrol engines need a source for ignition unlike Diesel engines, where the ignition happens due to compression.


What are the defferences between dessel and petrol engine?

Petrol & Gas engines are spark ignited engines where as diesel engines are compression ignited engines. Petrol engines works with explosion of fuel air mixture due to spark from spark plug inside the cylinder. Diesel engines works with combustion of fuel air mixture due to compression, compressed mixture attains a very high temperature which exceeds the flash point of diesel and starts burning inside the cylinder and the hot gases after burning of fuel misture exerts force on piston which makes the diesel engines work. Diesel engines are highly efficient than petrol engines.


Can you make a diesel engine which works on the basic principle of petrol engine or you can say it uses diesel as a fuel but works on the principle of petrol engine?

No, a diesel is a compression firing engine and a petrol is a spark firing engine. Diesel fuel will not burn in a petrol engine with spark plugs.


Can you use kerosene in petrol engine?

No! Yes! Low performance spark ignition engines in boats and tractors commonly use kerosene as a fuel. Some need to be started on petrol then switched to kerosene.