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Old 06-23-2022, 10:01 PM   #1 (permalink)
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Lightbulb Anyone successfully used veggie oil for gasoline engines?

Most waste veggie oil mod is on diesel cars, but most people have gasoline cars, that's why I want to explore WVO use on gasoline cars.

I have tried once to blend 0.3 gallon of virgin veggie oil with 3 gallons of E10 gasoline in a PFI gasoline car, just for a test. The result is unsatisfactory.

Car started misfiring and losing power about 60 miles on the freeway out of the gas station. RPM was around 3000. I checked the spark plugs, they have been fouled with a brown oil-like substance. The misfiring persisted until I topped up the 10 gallon tank with gasoline.

It seems veggie oil cannot combust fast enough as a fog ejected from nozzle with even 9 times of gasoline.

Have anyone tried running a gasoline engine on heated veggie oil? What about vaporized veggie oil? Anyone tried running partial veggie oil in a GDI engine?

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Old 06-24-2022, 01:43 AM   #2 (permalink)
It's all about Diesel
 
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I've been aware of some people adding up to 50% vegetable oil to gasoline in countries such as Thailand and Brazil, yet I'd take it with a grain of salt due to the oil not vaporizing properly. Maybe adding a tablespoon of turpentine to each tank could help...

But if I were willing to try, I'd take a look at the preparation done to gassers in Finland and other Scandinavian countries to use kerosene in the '70s and '80s, such as a lower compression ratio.

When it comes to direct injection, it may work better due to the increased heat at the compression stroke, and also taking the Hesselman engines as reference, because they retained spark-ignition yet could handle heavy fuels because of the direct injection.
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Old 06-24-2022, 02:01 AM   #3 (permalink)
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You will need a vehicle with Gasoline Direct Injection (GDI).

The vegetable oil is just about impossible to ignite if it is sprayed out of a common gasoline port injector (45-60 pounds per square inch injection pressure). A GDI engine runs 2000 to 3000 PSI. This results in a much finer atomization of the fuel oil giving it a better flame front.

Look up the military applications of diesel fueled outboards and drone propeller engines. They are fueled with JP8 but are spark ignited. Emissions are horrid, but that isn't a problem for the military.
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Old 06-24-2022, 02:12 AM   #4 (permalink)
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Quote:
Originally Posted by RustyLugNut View Post
Look up the military applications of diesel fueled outboards and drone propeller engines. They are fueled with JP8 but are spark ignited.
At least the outboards were 2-stroke, which is quite different on some aspect, yet the direct injection was precisely what enabled them to provide a heavy-fuel operating mode while also retaining the ability to run on gasoline.
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Old 06-24-2022, 08:51 AM   #5 (permalink)
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Well say good bye to the octane rating of that gasoline.
I'm seeing spark knock running 250:1 mix of 2-stroke oil.
Any sizeable portion of vegetable oil would make the gasoline unusable.
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Old 06-24-2022, 11:51 PM   #6 (permalink)
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This is the UAV engine I was thinking of.

https://www.unmannedsystemstechnolog...y/rcv-engines/

Not much is said about the fueling and ignition system but you can make some assumptions.

If you look far enough down on the page, their engine controller has an integrated fuel delivery as well as a dual spark ignition system.

Last edited by RustyLugNut; 06-24-2022 at 11:55 PM.. Reason: Additional
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Old 06-25-2022, 03:56 AM   #7 (permalink)
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Quote:
Originally Posted by RustyLugNut View Post
If you look far enough down on the page, their engine controller has an integrated fuel delivery as well as a dual spark ignition system.
Dual-spark ignition is standard on aviation due to reliability, yet it may also improve the flame spread.
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Old 08-09-2022, 12:42 PM   #8 (permalink)
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I've mixed about 2 gal of diesel with 13 gal of gas in a ((carbureted engine)) with so so results in 40F temps.
It had a random miss under load, got better as it heated up, but didn't quite go away.
Had it been 55F overnight or more (my overnight lows are rarely over that) I think it would have ran better.
In my opinion I think a carbureted gas engine would run on pure diesel if everything was heated up before it hit the carb. As well as the engine up to temp.

It was a 300-6 with the 8 to 1 compression.
The EFI version is 8.8 to 1
The original 1965/1972~ version is 8.9 to 1
The other thing I'll note is there was no 10% ethanol in the gas.

I think you would have far better luck running biodiesel in a carbureted engine then filtered fry oil. And doing it in a fuel injected gas engine Is going to be very poor results.
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Old 08-09-2022, 07:03 PM   #9 (permalink)
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Iíve used small amounts of veggie oil in my truck as top end lube (4oz per tank) seems to not mind it.
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Old 08-10-2022, 02:46 AM   #10 (permalink)
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Quote:
Originally Posted by trooper Tdiesel View Post
In my opinion I think a carbureted gas engine would run on pure diesel if everything was heated up before it hit the carb. As well as the engine up to temp.
Considering some cars which could run on kerosene, including the Ford Model T, maybe if you could vaporize Diesel fuel it would work reasonably too, yet it may be harder to vaporize...


Quote:
I think you would have far better luck running biodiesel in a carbureted engine then filtered fry oil.
Not only biodiesel is thinner, and most likely easier to vaporize, it's also easier to mix with gasoline and ethanol if you want to dillute it enough to eventually not have the need to pre-heat it.

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