what is thedifference between diesel engine& petrol engine?

Answer 1

gasoline (petrol) uses sparks from a spark plug in a cylinder to ignite fuel and create a small explosion essentially to create compression to run the engine.

Diesel uses compression to create the explosion that runs the engine. Diesel will not ignite from a spark, but rather when compressed rapidly under high pressure.

Answer 2

Many here are focusing on the fact that diesel engines use compression only, while gas engines need a spark. That's fine and true but that doesn't explain why big trucks and locomotives and big generators are diesel while most cars and lawnmowers are gas.

The key differences are the power that the engine can produce for a given amount of fuel and the longevity of the engine.

A big truck that hauls tons of stuff all the time would be far less economical to run on gas as on diesel. It would wear out much sooner and would need a huge engine to get the same power. This big engine would be heavier and eventually, you simply get to the point where gasoline can't do it (locomotive, submarine).

Answer 3

Both the petrol engine and the diesel are internal combustion engines. This means that the fuel is burnt inside the engine itself. This is in contrast to steam engines of the old days like the steam locomotive or wood to charge water into steam. Both the petrol and the diesel are reciprocating engines, that is they have a pistol that moves back and forth in a cylinder. The petrol engine requires a electrical iginition system using spark plugs. The spark plugs ignites the fuel and air mixture in the combustion chamber at the top of the cylinder. The unique difference with the diesel engine is that it does not require spark plugs for the ignition of the fuel. This is because the diesel engine creates such high pressure in temperature in the combustion chamber that the diesel fuel ignites spontaneously at the istant the fuel is sprayed into the combustion chamber.

Answer 4

The diesel engine is an internal combustion engine that uses compression ignition, in which fuel ignites as it is injected into air in the combustion chamber that has been compressed to temperatures high enough to cause ignition. By contrast, petrol engines utilize the Otto cycle in which fuel and air are typically mixed before entering the combustion chamber and ignited by a spark plug, In cold weather, diesel engines can be difficult to start because the cold metal of the cylinder block and head draw out the heat created in the cylinder during the compression stroke, thus preventing ignition. Some diesel engines use small electric heaters called glow plugs inside the cylinder to help ignite fuel when starting.

Answer 5

It's simple Petrol engine- give it petrol, it goes. Problems are generally minor but do occur More torque and acceleration but higher fuel consumption Diesel- More complicated set up but if there is a prob it is a prob. Diesel engines need the right amount of fuel + air at the right quantities. Less torque but more economical and cleaner. For big mileage go diesel For small go petrol (more fun to drive)

Answer 6

Petrol oil uses gasoline to run. It has sparkplugs which is used to burn the fuel. It has a carburetor which the gasoline passes and a distributor for some engines where the electricity is processed, some have a cdi in lieu of the distributor. The diesel runs in diesel fuel, and has an injection pump but does not have a carburetor and does not have a distributor or uses a cdi. Gasoline engine is much cleaner than diesel engine.

Answer 7

I believe a diesel engine ignites the fuel vapours by compressing it to the point where it gets hot enough to self-ignite. Petrol engines use a spark plug to generate a spark-caused explosion of the fuel vapours. Also the fuels are different.

Answer 8

Andrea's sounds like a cheap google answer.

Really, petrol needs a spark to ignite and therefore has sparkplugs, while diesel relies on pure compressed air that gets heated to cause a heat-explosion with the diesel oil

Answer 9

diesel is cheaper,, the engine itself is more expensive,, it ejects bad smell while working,, there's a special sound that u can distinguish between it and the gaz engine

the gaz has none of the above thing,, it's more expensive but a car with a petrol engine is cheaper that a one with a diesel one,,

i'd take a diesel car regardless to the smell and the sound but there's nothing u can do toward it..

Answer 10

A deisel engine has no electrical ignition systemm The fuel is ignited by the heat of compression.
If you put petrol into a deisel it will destot\y itself.