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MelodyZ85

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Make your own Biodiesel Part 1

There are at least three methods to run a diesel motor on biofuel utilizing vegetable oils, animal fats or both. All three are used with both fresh and pre-owned oils.

1. Use the oil just as it is-- usually called SVO fuel (straight veggie oil);

2. Mix it with kerosene (paraffin) or petroleum diesel fuel, or with biodiesel, or blend it with a solvent, or with fuel;

3. Convert it to biodiesel.

The first 2 approaches sound easiest, but, as so typically in life, it's not quite that easy.

1. Mixing it

Vegetable oil is a lot more thick (thicker) than either petro-diesel or biodiesel. The function of mixing it or blending it with other fuels is to reduce the viscosity to make it thinner so that it flows more easily through the fuel system into the combustion chamber.

If you're blending veg-oil with petroleum diesel or kerosene (like # 1 diesel) you're still using fossilfuel-- cleaner than the majority of, however still not clean enough, many would say. Still, for each gallon of

veggie oil you use, that's one gallon of fossil-fuel saved, and that much less climate-changing carbon in the environment.

People use different blends, varying from 10% vegetable oil and 90% petro-diesel to 90% vegetable oil and 10% petro-diesel. Some individuals just use it that way, start up and go, without pre-heating it (which makes veg-oil much thinner), or perhaps use pure vegetable oil without pre-heating it, which would make it much thinner.

You may get away with it with an older Mercedes 5-cylinder IDI diesel, which is a very hard and tolerant motor-- it won't like it however you probably will not eliminate it. Otherwise, it's not sensible.

To do it properly you'll require what totals up to an SVO system with fuel pre-heating anyway, ideally using pure petro-diesel or biodiesel for starts and stops. (See next.) In which case there's no requirement for the blends.

Blends with numerous solvents and/or with unleaded fuel are "speculative at best", little or absolutely nothing is understood about their effects on the combustion qualities of the fuel or their long-term effects on the engine.

Higher viscosity is not the only issue with using vegetable oil as fuel. Veg-oil has various chemical homes and combustion characteristics from the petroleum diesel fuel for which diesel engines and their fuel systems are created.

Diesel engines are high-tech machines with really precise fuel requirements, particularly the more modern, cleaner-burning diesels (see The TDI-SVO debate).

They're difficult but they'll just take so much abuse. There's no warranty of it, however using a mix of as much as 20% veg-oil of great quality is said to be safe enough for older diesels, especially in summer season.

Otherwise using veg-oil fuel needs either an expert SVO option or biodiesel. Mixes and blends are normally a poor compromise. But blends do have a benefit in cold weather.

Just like biodiesel, some kerosene or winterised petro-diesel fuel blended with straight vegetable oil reduces the temperature level at which it begins to gel. (See Using biodiesel in winter season) More about fuel mixing and blends.

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