Rindert, thank you for this video!
The experiment was done very well. Good comments, subtitles, all stages are shown in detail. Professional!
In light of the above, it was terrifying to watch him start the engine… If that can of oxygenated gasoline vapor had popped, it would have been very tragic.
But this video made me think again about eliminating backflash of gases in the engine intake. It turns out there is a solution! This is a fourth-generation propane-butane gas equipment - where the propane vapor obtained after the reducer is supplied by gas nozzles to each cylinder only during the intake phase of this cylinder. No explosions!
Now this made me think about how to turn diesel fuel into steam, for burning from an ordinary spark … Then the engine can become truly multi-fuel - only the controller firmware will switch. Sometimes it happens that a person who has many different cars refuels the car with diesel fuel instead of gasoline.
However, I still want to finish my wood gas generator so that I don’t have to stop at these gas stations at all! Here are the best fuels for cars and for goats:
Turning diesel to gas can be done but it will not prevent the bigest problem of diesel in a gas engine, its suseptibility to compression ignition, “low octane rating”.
If you are making your own diesel fuel you are already adding methanol. Increasing the quantity of the methanol will increase octane. I can’t really see any advantage to trying to run diesel in a sparked engine. Seems like long before it would ignite the plugs would foul.
The methanol added to veg oil is to convert the end product to a Methyl-ester oil and separate the “Sugery” component Glycerol. I don’t think adding more free methanol. would be helpful to make it run in an SI engine. Might even make things worse by drawing in moister.
I don’t think it was ever a thing in the USA ( its was not in Canada ) but in the UK they had a special tractor only mostly farm off road fuel called TVO.
It was a mix of diesel like gas-oils and lighter fuel in a cheap no road tax blend to help farmers.
You needed a special tractor with extra low compression ( like 5:1 ) and an intake manifold heater.
I doubt its been sold commercially in 30 years, so at rallies in the UK they mix their own from a blend of diesel and gasoline and the old tractors run quite well on it.
As you will note in the comments one of them says you can’t beat the smell…
Yup there is a smell to buring K1 or TVO in a spark ignition engine.
Back in the late '70s I mistakenly dumped 5 gallons of diesel in a Farmall M. It smoked, but it continued to run. The farmer I worked for adjusted the mixture screw to make it stop smoking. As the diesel fuel got used up and gasoline was added to the tank the mixture screw had to be readjusted. This probably wasn’t very good for that engine, but it did not foul the spark plugs.
Brass gauze can prevent backfiring from going further. A series of the gauze could contain any events.
As i work with cars, and “neighbor” is a gas station, we sometimes help their customers that has put the wrong fuel in their cars, after draining the tank i often have this “mixture” for free, bring it home for my Ferguson tractor, since it has a kerosene engine it often runs ok on this diesel/gasoline mix, if it smokes little i can adjust it by mixing in more gasoline.
About spark igniting diesel you can look up the Hesselman engine, a low-pressure, spark ignited diesel, invented by Jonas Hesselman.
This engine gained somewhat popularity, anyways in Sweden, but i remember reading somewhere that Waukesha made them under license to. These engines was known for fouling the sparkplugs, working best under heavy load, some types was made to cut out half of the cylinders at idle, to keep some load at the working cylinders.