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What is the difference between a diesel engine and a petrol engine - mixing of the air and fuel?
Wiki User
∙ 8y ago
- in the original gasoline (petrol) engine fuel and air were premixed in a carburetor before entering the cylinder through the intake valve, ignition is caused later when the spark plug fires (to prevent high compression high power engines from knocking and thus damaging themselves it was necessary to use only high octane fuel, which typically required adding tetraethyl lead a deadly poison to the fuel)
- in the diesel engine the fuel is injected into the air filled cylinder at maximum compression and instantly ignites (from the heat of compression)
- in the modern fuel injected gasoline (petrol) engine fuel is injected into the air filled cylinder just before the spark plug fires (to prevent the chance of knocking (i.e. preignition) because of use of low octane fuel)
Wiki User
∙ 8y ago
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What is the difference between a diesel engine and a gasoline engine?
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What happens when mixing calcium nitrate in water compound?
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What is the difference between a gasoline and a diesel engine?
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.
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See the Wikipedia article linked below
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