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  #1  
Old 02-13-2006, 04:22 PM
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Talking Gas in a diesel engine.

why can't you put gas into a diesel engine?

What is the exact definition as to why you shouldn't?

from what i think and your guys ideas of makeing Biodiesel and that other kind that you actaull mix gass with to kind of refine it why not use starigh gas.

don't worrie i am not going to do that to my engine. i am curious and no one can give a good straight answer.

Don' think i am an idiot i just thought that if ya'll are refining grease to go into the engines why not use dsomething that is refined even more then diesel itself

please help me understand.

~kb

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  #2  
Old 02-13-2006, 04:25 PM
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diesel engines are compression engines while gas engines are spark ignition engines. last time i checked gas doesnt combust under compression like diesel fuel. something like that
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  #3  
Old 02-13-2006, 04:27 PM
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Gasoline burns too quickly. Combustion would begin while fuel was being injected.
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  #4  
Old 02-13-2006, 04:32 PM
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The only reason I know for sure of is gas has a lower BTU rating and doesn't generate as much power as diesel. Anti knock compounds might also cause trouble.
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  #5  
Old 02-13-2006, 04:34 PM
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Gas is way more explosive than diesel is, its a solvent. Diesel is an oil (thats why it doesn't evaporate). Diesels are high compression in order to explode the diesel fuel, between 18:1 and 24:1 usually, the MB's are around 22.5:1

Gas engines are between 11:1 and 8.5:1 in compression usually, they use the spark plug to explode the fuel.

Gas is also not a lubricant, so not only does it destroy the engine, it will ruin the injection pump as well.

Conclusion: Use diesel in a diesel.
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  #6  
Old 02-13-2006, 05:02 PM
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Another thing that i wanted to know is why don't diesels overheat like gas engines?
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Kaleb, 17 years old. I own a 1988 jeep wrangler. it has a carburated 4.2 liter. it also has an automatic. I bought it all stock from a man that had it for a couple of years and had bought it from the original owner. when the guy dropped it off it was driving some what good but not the way i test drove it. i put alot of new things in it, the list is:Radiator, water pump,fuel lines, fuel filter, plugs and wires, egr valve, pcv valve, jet and seat. i think thats it.
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  #7  
Old 02-13-2006, 05:10 PM
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Quote:
Originally Posted by Goowrangler
Another thing that i wanted to know is why don't diesels overheat like gas engines?
Oh they can. But diesels have an unregulated flow of air coming into the combustion chamber which can have a cooling effect compared to a gas engine which severely limits the amount of "cold" air.
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Old 02-13-2006, 05:11 PM
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Quote:
Originally Posted by Goowrangler
Another thing that i wanted to know is why don't diesels overheat like gas engines?
Who told you that
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  #9  
Old 02-13-2006, 05:12 PM
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Quote:
Originally Posted by Goowrangler
Another thing that i wanted to know is why don't diesels overheat like gas engines?
everything overheats its just a matter of when
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  #10  
Old 02-13-2006, 05:13 PM
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Quote:
Originally Posted by Goowrangler
why can't you put gas into a diesel engine?

What is the exact definition as to why you shouldn't?

from what i think and your guys ideas of makeing Biodiesel and that other kind that you actaull mix gass with to kind of refine it why not use starigh gas.

don't worrie i am not going to do that to my engine. i am curious and no one can give a good straight answer.

Don' think i am an idiot i just thought that if ya'll are refining grease to go into the engines why not use dsomething that is refined even more then diesel itself

please help me understand.

~kb
Gasoline will combust to quickly and explode as the piston is still traveling up. This basically causes the piston to hit a "wall" mid travel and be forced back down before the crank is in the right position to allow it back down.
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  #11  
Old 02-13-2006, 05:15 PM
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Quote:
Originally Posted by rg2098
Gasoline will combust to quickly and explode as the piston is still traveling up. This basically causes the piston to hit a "wall" mid travel and be forced back down before the crank is in the right position to allow it back down.
Exactly. Same phenomenom that happens to a slight degree when you hear a gasser knocking due to using low octane fuel or bad timing.
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  #12  
Old 02-13-2006, 05:26 PM
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Quote:
Originally Posted by rg2098
Gasoline will combust to quickly and explode as the piston is still traveling up. This basically causes the piston to hit a "wall" mid travel and be forced back down before the crank is in the right position to allow it back down.
ummmm.... a diesel engine doesn't inject the fuel on the compression stroke.
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  #13  
Old 02-13-2006, 05:41 PM
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Quote:
Originally Posted by ConnClark
ummmm.... a diesel engine doesn't inject the fuel on the compression stroke.
Quote:
A diesel engine takes in just air, compresses it and then injects fuel into the compressed air. The heat of the compressed air lights the fuel spontaneously.
http://auto.howstuffworks.com/diesel1.htm
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  #14  
Old 02-13-2006, 05:42 PM
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you can run it on used cooking oil ... ^_^
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  #15  
Old 02-13-2006, 09:21 PM
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Quote:
Originally Posted by rg2098
Adam, I disagree with your above statement. (before this)

Im fairly sure the the fuel is injected right as the piston enters TDC. When the piston is at the top of the cylinder the temperature from compression is the highest. Right then the fuel is injected and explodes due to the temperature of compression alone.

In this way the injector firing combines the ideas of a spark plug and fuel entering the system at the same time.

Isnt that why injectors have to pop at such hight pressure? To overcome that which is in the cylinder?

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