It is ignited by compression. The air fuel mixture is compressed by the piston going up. Some diesels have glow plugs too that heat up the air fuel mixture so it is more easily ignited.
A petrol engine is ignited by a spark plug, and a diesel engine is ignited by the heat produced from the air/ fuel mixture being compressed in the cylinder
diesel
Compression.
a petrol engine needs to mix its air and fuel before passing it into the combustion chamber before being ignited diesel has its air mixture heated as the piston compresses it in the combustion chamber then the atomized diesel fuel is injected into the hot air and is ignited.
Diesel
That's your average Diesel, or compression ignition engine.
The operation of a nitro engine is similar to a normal gas/diesel engine, where a fuel mixture is ignited, and the energy drives cylinders back and forth in a cycle, all the while keeping an element hot so that the fuel stays ignited. The only difference is that a nitro mixture is more complicated, so a hole has to be bored into the engine so the mixture can keep flowing in a certain way.
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
The main difference is the way the fuel gets ignited. In a gasoline engine, there is a spark plug connected to coils driven by the points and the distributor, that electrically generate a spark at the right time and ignite the fuel. In a diesel engine, there are no electric parts and no spark plug, and the fuel ignites simply because of heating up up by being compressed. That accounts for diesel engines being much more water-friendly, since getting the high voltage electrics of the gasoline engine wet disables it quite easily. It also accounts for diesel engines starting up harder in cold, since they need to be hot to ignite fuel, not having a spark to aid them do that.Improved AnswerThree Major Difference between Diesel and Gasoline Engine.Type of fuel it uses: Diesel fuel is a less volatile fuel than gasoline but possesses a greater number of BTU's per gallon. As a result, more total horsepower is obtained from a gallon of diesel than a gallon of gas.Type of Ignition: the fuel and air mixture in a gas cylinder is ignited by a spark. In a diesel engine, the mixture is ignited by the heat from compression.Fuel and air mixing: In a gas engine, the fuel and air mix takes place in the carburetor and the intake manifold and the fuel is ignited by a spark plug. In a diesel engine the diesel fuel is mixed with compressed air when the fuel is injected into the cylinder. Because air heats up when it's compressed, the fuel ignites.
The main difference is the way the fuel gets ignited. In a gasoline engine, there is a spark plug connected to coils driven by the points and the distributor, that electrically generate a spark at the right time and ignite the fuel. In a diesel engine, there are no electric parts and no spark plug, and the fuel ignites simply because of heating up up by being compressed. That accounts for diesel engines being much more water-friendly, since getting the high voltage electrics of the gasoline engine wet disables it quite easily. It also accounts for diesel engines starting up harder in cold, since they need to be hot to ignite fuel, not having a spark to aid them do that.Improved AnswerThree Major Difference between Diesel and Gasoline Engine.Type of fuel it uses: Diesel fuel is a less volatile fuel than gasoline but possesses a greater number of BTU's per gallon. As a result, more total horsepower is obtained from a gallon of diesel than a gallon of gas.Type of Ignition: the fuel and air mixture in a gas cylinder is ignited by a spark. In a diesel engine, the mixture is ignited by the heat from compression.Fuel and air mixing: In a gas engine, the fuel and air mix takes place in the carburetor and the intake manifold and the fuel is ignited by a spark plug. In a diesel engine the diesel fuel is mixed with compressed air when the fuel is injected into the cylinder. Because air heats up when it's compressed, the fuel ignites.
Diesel is a type of internal combustion engine wherein the fuel is ignited solely by heat produced by rapid compression of the air in the cylinder. Not by an electrical spark as in a gasoline engine. As the cyl air is compressed the air becomes heated. Fuel is injected into the hot cylinder and is ignited by the heat alone
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.