Why do cars only run on petrol/Diesel oil ?!?

Like, what isit about oil that make cars work ? how come water dosnt work ?

16 Answers

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  • Zyzzyx
    Lv 7
    1 decade ago
    Favorite Answer

    Automobile engines use fluids that burn. Water does not burn.

    Very basically, a gasoline engine takes in a little spray of fuel along with a gulp of air into a chamber (cylinder) that is then closed. An electric spark is introduced, causing the mixture to burn. Burning, in turn, generates combustion gasses (think smoke) which expand to a larger volume thus moving a piston inside the cylinder and turning the crankshaft.

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  • Anonymous
    1 decade ago

    Actually you can take that same engine and run it on a lot of different things. Coal gas was big in the hills of West Virginia in the 80's. It was actually less expensive to make gasoline out of than anyone now admits. They said at the time it only costed an extra 10 cents per gallon to make. But since GM would not honor their warranty on cars that used that type of gasoline then it got pushed out.

    Moonshiners where I grew up at used moonshine a lot in their cars. Most people where I am now think that corn whiskey will burn up your motor since it burns hotter, but if you mix it with some Wesson Oil, it doesn't hurt them any worse than running oil made petrol. I have seen an old chevy 350 engine torn apart after 200,000 miles of running on moonshine and veggie oil and it was extremely clean inside. They only rebuilt it to get more power out of it.

    Diesel engines will run on lots of things, used motor oil, corn oil, used peanut oil. Not much to change to make that happen either. A line from the heater coil needs to be introduced to a larger fuel filter to heat up the veggie oils and a way to keep the oil liquid in the tank, and thats all you need.

    As far as the internal combustion engine goes it can use a lot more than gasoline. Or even more than fossil fuels. However, it is still polluting even if it is burning pure moonshine. True it is colorless and no smoke but there is still carbon being burnt. The Koreans have a neat idea with magnets. Using rare earth magnets to produce engines that run on the pull/push of the magnets, it is the torque they are not getting down. So having that as the primary power for the cars propulsion is not going to happen anytime soon. But to make a generator out of it, Where there is no sudden jerks, and everything is steady. Then charge the batteries for an EV. Now you would have a car with no air pollutants.

    Source(s): CTC coal group. http://www.dieseloilconversions.com/
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  • Anonymous
    1 decade ago

    It cost less and there is or was a lot of oil. How we are looking to other oil's to make the energy that a car needs to run. The only way we could have a car that run on oil is it has to have oxygen an element of water to combust to give the car the energy it needs to go.

    Water dose work there are people that are making a car that runs on hydrogen the H in H2O but they have to have the O to make it run and it puts out water, this is not great. We have burned up a lot of the element O in the H2O now they are looking to burn up the elements, hydrogen and oxygen that are combustible to make power to run everything. If you burn up all the H2O what do we drink.

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  • 4 years ago

    The first diesel engine was designed by Rudolph Diesel in the early 1900's and it was powered with peanut oil. They are already increasing the price of vegetable oils, so that when everyone wakes up to the reality, vegetable oils will probably be more expensive, The big companies have known this for years.

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  • 1 decade ago

    It takes energy to make the wheels turn. There is more energy in oil than any other natural substance on earth.

    Water cannot be used, but you could split the hydrogen out of water and burn it. Problem is, it would take alot of energy to do that, and this energy would have to come from a power plant using gas or oil or coal or nuclear.

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  • ?
    Lv 7
    1 decade ago

    Hi, There are different kinds of energy. One is the energy that something has when it is in motion. Another is the energy something has when it is at rest. Energy can be on the physical level like a boxer's punch or in a mother rocking her child. It can be on the molecular level so that when we pour peroxide on to baking soda it fizzes up or when you burn a piece of paper it produces light and heat. And it can be on the atomic level where breaking or combining atoms releases energy in several forms.

    A car needs energy to go. That energy is found in the burning of the fuel to produce not only heat but pressure as the fuel is burned in the form of an explosion in the cylinders of a car. The ideal fuel has to be stable enough to move around, holds a lot of trapped energy that is easily available and it has to be common enough so that it is relatively cheap.

    Carbon is a very common element and it combines with oxygen easily to produce carbon dioxide. Petrochemicals came from plants that in prehistoric times trapped carbon into their substance. Over long periods of time this was changed to the coal, oil and gas we have today, the fossil fuels. Refining it makes it readily available

    Hydrogen also combines very easily with oxygen to produce water and releases energy but the hydrogen is not so easily available and it costs money to make it This is especially true if it has to be broken out of water to begin with. 10000 gallons of hydrogen is equal to only around 40 gallons of gasoline, so it does not hold a lot of energy even when it is available.

    Gasoline is stable enough to work with but unstable enough for combustion. Water on the other hand is very stable. It requires energy to get at the components that will return to water when combined. The energy available in the chemistry of water is very little. We have to look to physical properties like it's location behind a hydroelectric dam or it's nuclear properties to find useful energy properties.

    Source(s): Mike, liquids essentially don't compress. Air in a diesel cylinder will and it might just get hot enough to ignite the diesel fuel suspended in it. Gasoline is noted for it's ability not to ignite in the lower compression of a gasoline engine. The spark plug does the job. Water Vapor is actually a great refridgerant and would be commonly used except that it rots out most compressors.
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  • Mike T
    Lv 6
    1 decade ago

    Petroleum and its derivatives are adiabatic http://en.wikipedia.org/wiki/Adiabatic_process

    whereas water isn't.

    Adiabatic means a change in temperature occurs due to a change in pressure. So in internal combustion engines the pistons compress the petrol / diesel gas. This compression increases the temperature of the gas which leads to the fuel igniting, expanding and pushing the piston back down to repeat the process.

    Water just doesn't do this so you can't run an engine on it.

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  • 1 decade ago

    Water in its elements, hydrogen and oxygen are combustible. the reason we don't use other energy sources comes down to the greed, power and control of those pocketing billions of dollars from the oil industry.

    Do you know what century the first electric cars were made and used?

    Check a good encyclopedia you will be surprised.

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  • Vivian
    Lv 4
    3 years ago

    Vegetable is not just a medical term, it is a cooking term. So the qualifications to become vegetable are not very coherent, which is why we have cases like the tomato: people argue both ways.

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  • 1 decade ago

    because the engine needs some chemicals to run which is in Petrol diesel gas and solar energy

    water or milk or any other liquid except the above mentioned ones does not have any chemicals

    thats why

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