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A diesel engine,if i use there petrol fuel,What is problem
there & what is the result?
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Answer Posted / sumanth
Diesel is a slow burning liquid vs petrol (gasoline) which burns so fast that it is considered to explode.
A petrol engine compresses a petrol and air mixture and then fires a spark plug to cause the mixture to explode. The expansion of the exploding gases hits the top of the piston and causes it to be blown down towards the crank shaft, turning the the crankshaft which supplies the rotary motion out of the engine to power other devices.
A diesel engine compresses air in the cylinder to the point where it becomes hot enough to ignite a fire. Then diesel fuel is injected under high pressure where it begins burning. The burning gases expand and supply a high pressure to the top of the piston. The rest of the action is the same. Since the diesel supplies a slower, but longer lasting pressure against the piston, it produces much more power (called torque) than a same size petrol powered engine.
The glow plugs in a smaller diesel engine are used only to warm up the metal in the cylinders to make starting easier. They are not used after the engine has started, vs the spark plugs in a petrol engine that are needed to fire every time the cylinder has reached its proper position. (Larger diesel engines develop sufficient heat to not need the help of glow plugs for starting.)
A good analogy of the difference in power production is to hit a piston with a hammer to drive it down. That is the principle of the explosion of the petrol. The diesel is like applying pressure to push the piston down by pressing on it with your hand. You get a quick but short lived push against the piston from the petrol (hammer) and a slower, but longer lasting and more consistent push from the diesel. (hand)
Put diesel in a petrol engine and it will not explode, nor even burn. The engine will not run. You might as well have tried to burn water.
Put petrol in a diesel and it will explode at a much higher pressure than the burning diesel could develop. The result would be pieces of engine scattered all around as it exploded from the pressures it was never designed to use
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