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Why is petrol not made from straight-chain hydrocarbons?
Straight-chain hydrocarbons ignite very easily; in a vehicle, they would ignite before they reached the engine. Branched hydrocarbons are not as reactive so they are used for fuel such as petrol.
What is the difference in bhp between petrol and diesel engines?
Both our internal combustion engines but the main difference is that a petrol engine uses spark plugs to ignite the fuel but a diesel engine has no spark plugs but instead uses compression to ignite the fuel. A diesel engine is also built much stronger than a gasoline/petrol engine. Diesel engines get better fuel mileage, last longer, and have much more torque or pulling power than a petrol engine. The only disadvantage to a diesel is the fact that it is more costly to build than a gasoline engine.
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 cant petrol be used in diesel engine?
Because one has a petrol engine and the other has a diesel engine. Petrol/gasoline does not ignite the same way as diesel. It also does not have the lubrication qualities that diesel has. Gas in a diesel engine will damage the fuel system if the diesel very quickly.
What is cetane number for petrol?
There is no cetane number for petrol. Cetane is a measurement of Diesel fuel and Octane is a measure of Petrol. Each is a measure of the combustion ability. Cetane is a measure of the amount of time from injection of the fuel into the combustion chamber and the actual ignition of the fuel. Diesel's ignite the fuel through compression and not spark as in a petrol engine.
Why you can't use diesel in petrol vehicle?
The fuel will not ignite properly.
Is fuel injection for diesel engines more efficient?
diesel only comes in fuel injection, the fuel needs high pressure to ignite, and cannot only be sucked in like with a carburator on a petrol engine
Can we use fuel injector in petrol engine?
Yes, you can use a fuel injector in a petrol engine.
Why diesel engine has more efficiency than petrol engine?
Diesel is a more combustible fuel than petrol, therefore less fuel is required to generate the same power as petrol. This also means that spark plugs aren't required, like in a petrol engine, since the diesel will ignite off engine compression alone. This also makes the engine arguably more reliable since there are less parts, and less things to go wrong.
Why twin spark is used only in petrol engine?
Diesel engines do not use spark plugs to ignite the fuel. Instead they use the actual compression of the piston to ignite the fuel. To start a diesel engine a glow-plug is used, once the engine has started the compression causes the ignition. As a results of this diesel engine blocks are heavier to take the force of the ignition
The air fuel ratio of the petrol engine is controlled by?
The air fuel ratio of the petrol engine is controlled by Carburetor
Why there is spark plug in petrol engine and not in diesel engine?
Because a diesel engine doesn't need spark to ignite the fuel. Diesels are very high compression engines, and the high compression makes enough heat to ignite the fuel. To prevent the fuel from igniting prematurely, it is injected only after the valves have closed and the piston is near the top of the compression stroke. Once the fuel is injected, the heat from the compression ignites it instantly.
