what happen when we use petrol in diesel engine and why?

Question

what happen when we use petrol in diesel engine or diesel in petrol engine and why give detail

Answer 1

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.

Answer 2

Petrol In Diesel Engine

Answer 3

It will wreck the engine. You can get away with about 10% petrol in a diesel engine if you have put it in by mistake, but not the other way round. Too much petrol and you would have to have the system drained. If you have put petrol in a diesel you should top it up to full with diesel to dilute the petrol, as long as it wasn't too much petrol in the first place. Any diesel in a petrol engine and it needs draining off totally. Check with a mechanic, which I am not.

Answer 4

Diesel engine which is a compression ignition type engine works on the principle of spraying atomized diesle into the combustion chamber of engine at the end of compression stroke. The air temperature inside the chamber at that time is around 600 degree celcius. At this high temperaure diesel will self ignite and excerts force on the top of the piston which is the power outupt given by the engine.Since petrol is highly volatile and inflammable than diesel it will spontaneously burn and cause knocking and damage to the piston, connecting rod and its bearings. In addition to that this will also damage the fuel injection pump which is doing the function of supplying the fuel at the correct timing into the engine cylinders. These components are very costly and you end up in a major engine overhaul.

Answer 5

When you use petrol in a diesel engine it simply cleans out the fuel system, but then refuses to run unti l you get the fuel and loosened crud out. Hopefully a fuel filter will catch all the crud that gets loosened. Since the anti-knock index of gasoline is higher than diesel, it will not burn well in a diesel, but shouldn't kill it.



The opposite situation is worse. Diesel ignites much easier than gasoline in the presence of heat and pressure, (but oddly enough is very stable without heat and pressure) So when your gasoline engine tries to put it in the cylinder and compress it, it will detonate before the spark plug lights it off, which is called knock, and that causes excessive heat in the cylinders, which can literally melt parts of yoru engine.



Nozzles at a filling station gasoline pump are smaller than diesel ones, so it is not possible to accidentally put diesel in a gas car unless you really try hard, but it is possible to put gasoline in a diesel tank. I used to own an old mercedes diesel, and I'd put 15% 87 octane gasoline in it whenever I filled up in the winter to try to keep the fuel less viscous to make it easier to start in lower temperatures. I think up to 15% is acceptable. Some push it higher, but I wouldn't.



A few notes from other answers:



Diesels do not run on glow plugs. They only use them to heat up the cylinders prior to starting the engine, but once it is started aren't used again. This is because diesels need heat and pressure to cause combustion. With a cold cylinder it won't work.



Diesel is not rated with octane at all, but if it were, it would be lower-not higher than gasoline, which means it is easier to ignite in the presence of heat and pressure.



You will not blow the top of a diesel engine off by putting gas in it. You might blow the top of a gas engine off by putting diesel in it, but I doubt even that would happen.

Answer 6

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anyone who says gasoline will ignite too soon in a diesel is ignorant. what will happen is the fuel won't ignite or will ignite poorly with a longer delay period. if the amount of gas to diesel is low enough it won't be all that bad except it won't cold start well. the engine compresses air to a temp/pressure so high that when the fuel is injected it ignites from the heated air. gasolines self ignition temperature is too high for most diesels. ideally you would drain it all out and take no chances since its likely to foul stuff up and maybe plug the injectors with time. ok none of you answerers that say gas ignites too fast in a diesel have bothered to try it have you? if you inject gasoline in a compression ignition engine( diesel engine) it won't want to light at all. duh. try it sometime. ether will ignite fast as will heptane, MEK, methanol etc. for crying out loud the fuel can't ignite sooner than the injector timing allows anyways unless you mix it with the air stream. 2ed edit: ok there is so much misunderstanding about this matter i designed an experiment, everyone who wants to see the difference should do this. get 3 balls of newspaper, tissue paper or what ever you have and saturate one with good diesel and 2 with good gasoline. set them on dirt or bricks. light a match and try to light the diesel one, don't worry it wont light likely no matter what. now light one soaked in gas with a match, easy right? now that you know how easy that is try a red hot poker or piece of 1/4 inch steel rod with the end heated bright orangeish red. just red is ok but orange is best, use an acetylene torch, propane, camp fire whatever. plunge it into the diesel soaked rag and foom! up in a ball of flame it goes. now reheat it and try it on the other gas soaked rag. go ahead and resoak if you wish it wont matter it still won't light at orange heat, all it will do is smoke because its self ign temp is too high for an 1800 degrees F ign source.

Answer 7

Diesel engines ignite the diesel fuel by high compression. Gasoline engines ignite the gasoline using a high-voltage spark. The fuels are not interchangeable.

Answer 8

Diesel motors have a different compression than a gasoline motor, since diesels octane rating is lower than gasoline's octane rating, and diesels use glow plugs so if you want to run diesel in a gasoline motor, you will need to change the motor compression by changing the cylinders

Answer 9

petrol has a higher combustion rating then diesel. so burning a higher volatile rating in a diesel engine could fowl plugs, fuel injection, cylinder head, cam and require piston work.



If u accidentally poured it in, I would have that siphoned out and do not turn over the motor.

Answer 10

Once the Diesel fuel makes it's way through the lines the vehicle will no longer run. You need to flush everything out, intake system, fuels lines, fuel tank.



Diesel engines run on "glow Plugs", gas "petro" runs on spark plugs. Gas is highly combustible and Diesel burns much, much slower.

Answer 11

You'll ruin the engine.



Reason being gasoline is more flammable (lower octane) than diesel. So while the piston is on it's compression cycle, the gasoline will ignite, vastly over pressure the piston and it'll either lift the head, break the piston, or god knows what else.

Answer 12

Due the higher compression of diesel engines it is dangerous to introduce gasoline into the system due to the engine will rev up uncontrollably and will fly to pieces..Drain the fuel tank and refill with diesel only.....I would not try to drive the fuel out of the tank due to problems listed above.........Good luck.....

Answer 13

simply u will ruin the engine