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Old 09-12-2006, 11:58 PM   #1
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Veggie Oil mixed with Gasoline??

Has anyone ever tried to mix a small porportion of veggie oil with gasoline to stretch it a bit. I know the octane rating would go down a bit, depending on the percentage of oil, and I know it would probably smoke, but would the BTU's burned be equivalent to a mileage increase if the veggie oil was free?
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Old 09-13-2006, 01:48 AM   #2
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Cetane, not octane is what you're interested in for diesel fuel. I mixed a small amount of diesel with some veggie oil and a small amount of gas with another jar just to see how it works. Both do a fine job as solvents. I determined that even a 50% mixture of diesel would be acceptable to run for me as it most CERTAINLY spees up filtering. Most people who cut their WVO do it to make things flow faster, whether it be for filtering or to aid in faster starting in cold weather.

That said....diesel is a safer substance to use for mixing as it is what the engine was designed for. In my experiemtns, gasoline mixted better and had no seperation after sitting for a week. Most manuals for diesel engines give a list of substances you can mix with diesel in the winter to prevent waxing. Most go as high as 25% for gasoline, but I don't know that I would ever subject my motor to that. I'm sure 15% would be ok, but if you're trying to just use WVO as a supplementary fuel, why not mix it 50%? It will essentially double your mileage in terms of cost and might even allow cold starting the motor on the mix without risking damage.

All said, I would probably use google and the search ifunction on this board. There are thousands of people out there running all kinds of fuel blends.
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Old 09-13-2006, 09:49 AM   #3
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I was talking about mixing vegetable oil in with gasoline to go in a gas engine, not a diesel engine. Sorry, I wasn't clear about it.
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Old 09-13-2006, 12:43 PM   #4
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i don't think that would work. The fuels are too dissimilair. Gasoline is flamable, while diesel fuel is only considered combustable.

The flash point (temperature at which the fuel gives off enough vapor to ignite at sea level...it's vaports that ignite, not liquids) of gasoline is about negative 30 degrees F while veggie oil is about 300 degrees F.

You cannot burn diesel fuel in a gasoline engine, it just won't run. The reason diesel fuel (flash point about 120 degrees) ignites in a diesel engine is due to the extremely high compression ratio. I think my mercedes dieses was about 20 or 23:1 compression. That's about 3 times the compression ratio of a gasser.

A diesel engine would run (not for long) on gasoline. Compression generates heat. A diesel operates off of the principle that if you compress a flamable liquid enough it will ignite. The problem with gasoline in a diesel is that the gasoline begins to ignite before the pistons reach the top of the cylinder causing a lot of forces to be generated at the wrong time.

Another problem with burning veggie in a gasser is trying to keep the oil hot as it works it's way through the carberator. One more thing is that veggie oil leaves a lot of carbon buildup, and i'm sure this carbon would coat the spark plug in short order causing the engine to not run due to ignition problems.
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Old 09-13-2006, 01:31 PM   #5
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mixing

I have a friend that works on OTR trucks. some of his clients run a 50/50 mix of diesel and filtered used oil in their trucks. They lose a small amount of power but when your truck or bus uses 4 gallons of oil perchange there is plenty to go around. So they cut their fuel bills in half. Needless to say this is illegal and not smart for winter use. I might try it in my bus next summer. I work at a dealership so used oil is free. I think ill start with a 20% mix and see what happens, worst case I have to flush the fuel lines
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Old 09-13-2006, 02:32 PM   #6
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I've never heard of using waste motor oil other than for a heater. It would make sense though since the furnaces that use the oil do so by atomizing it just as our injecters do.

As for the legality....it really is a gray area. Technically it's illegal on some accounts because no tax is paid. However, fuel additives of just about any kind are legal and the EPA doesn't frown on the idea of experimental fuels within reason. I guess it would really depends on your locality, but many rather public trips have been taken across the US in buses powered by veggie oil. If you don't get in any trouble after being on Good Morning America, chances are you're going to be ok. Most people I've talked to are more curious than anyhting else.
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Old 09-13-2006, 04:28 PM   #7
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the question about gasoline mixed with veggie was to run in a GAS MOTOR, not a diesel

i don't see why motor oil woulnd't run just fine mixed in with diesel, especially if it's filtered first. Should have about the same flamability properties as diesel, and we know that engine oil lubricates well.
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Old 09-13-2006, 10:16 PM   #8
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There was and still is an of and on discusion on http://www.ford-trucks.com/forums/44389 ... oil-3.html

Lots of user say not to add waste motor oil and a few that say they have seen it done in over the road trucks that will burn it off in a few days anyways.
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Old 09-16-2006, 11:38 AM   #9
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Like a 2 stroke only with veggie oil I suspect you would suffer the same problems you would have by adding 2 stroke oil to your 'GAS' tank...


Adding oil would RAISE the octane level because it is HARDER to ignite, 93 octane is harder to ignite than 85 octane, starting fluid is about 40 octane.
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Old 09-17-2006, 09:08 AM   #10
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my understanding is that octane rating of fuel is actually a rating of how much a fuel can be compressed before it ignites. Theigh higher octane fuels can withstand greater pressures before igniting. This is important if you have a motor with a high compression ratio.
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