I think I'm missing something here.

If your friend hasn't got the impetus or inclination to make some money from it he stands to loose nothing by putting out the word and helping others.

I therefore think there are two possibilities:

A) He enjoys the self satisfactory smugness gained from knowing you're doing something better than anyone else, and better than those who would do it for commercial gain.

or

B) Some part of the process uses/emits dangerous/undesirable byproducts that aren't up to modern health/safety standards.

i dont get it

the stuff that keeps your oil thick is the glycerin

glycerin is bad

good biodiesel should be thin, its not been diluted by the methanol/alcali. That acts as a catylist it changes the base oil but not by disolving in to it or mixing with it but by breaking down the long molecule chains into an ester( bio diesel) and glycerin( sticky goo)and the un changed catalyst(methanol)

dont think there is a mechanical process( ie filter/ centifuge) that can affect the chemical make up of the vegetable oil.

you may have an extremely pure or clear oil but its not bio diesel its just clean oil

I couldn't be bothered with all that shite. If you're too tight to pay for fuel don't buy a 3 litre 4x4 init.

Bingo.

Quite but being tight and skintight is another thing

Sam it's perfectly legal. You couldn't put a law on it it's so simple

Anyway Sean no chemicals used. It works and has for 4 years andseveral many trouble free miles and litres

I will take a pic of the oil when I'm next there.

Anyway it works fine for him!!

Back to 602ing!

‎1. Go to google translate
2. English -> French
3. Type in "Take a dirty picture for me"

4. Copypaste the translated text and reverse language to French -> English, paste into box
......
5. Look at resulting text

just saw that on fb, couldnt resist..

Do you wank in it? as that could be top secret!

If veg oil turns you on that much then, well thats just plain weird.

Not necessarily 2cv related, but there seem to be some very clever people here!

I take chemistry at AS level, we've only just started and I am by no means a good chemist, but today our teacher was talking about alternative fuels for vehicles, and was saying that if one ran a car engine on hydrogen and oxygen, you could collect the water vapour it produced, condense it back into water, then use electricity from the alternator to electrolysis it, then feed the engine off the Hydrogen + Oxygen produced. And so on...

Again, I don't know much about it, but electrolysis is essentially breaking the H-O bonds in a water molecule, leaving Hydrogen and Oxygen gas? That takes energy in the form of electricity. When those gases are combusted in the cylinder, new O-H bonds are made, giving off energy and making water?
And the amount of energy needed, in an ideal world, to break the bonds in the first place is exactly the same as the energy given off when those bonds are made again?
So even in an ideal, frictionless world, the most you could possibly hope for would be to keep an all ready running engine running, devoting all of its power to electricity for electrolysis, with no losses. Obviously that doesn't happen because of friction, and heat losses when converting types of energy etc.

But he was actually saying you could just use a little of the energy from the engine to generate sufficient energy to keep the electrolysis going, and use all the rest of the energy to drive a car. First law of thermodynamics - perpetual motion??

Am I missing something obvious, or is he just wrong?

The consensus seems to be that the idea of perpetual motion violates the second Law of thermodynamics. So i would be skeptical to accept that it is possible with a hydrogen fuel cell. you would have to calculate the exact current output of the alternator, and the amount of H2O that the machine could split into hydrogen and oxygen. I have a feeling that the capacity would be too low to convert all of the exhaust. which means you are already losing one of the fuel products.
And even if it did exist, i have a strong feeling that it would be obstructed from entering the world market. For example, when Los Angeles said that they would not let any cars enter the city that ran off fossil fuels, Mercades had a Working hydrogen fuel cell prototype within a year, I am pretty sure they already had that design in a filing cabinet somewhere!