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That's not entirely true.
While biodiesel is a real thing, you will not get a result that is safe for long term (or short term) use out of something like used cooking oil without some serious effort to sufficiently filter out contamination.
This is not DIY level stuff. In a lab your yields will be low and slow, and doing it at scale is expensive enough that biodiesel isn't much of an industry compared to the stuff made from crude.
That might change with prices climbing but few are going to be turning fats into fuel in their back yard.
Like I said, follow the instructions. That includes removing impurities if you're working with used cooking oil. If it's unused then that simplifies things.
Doing it at scale may not be economical because of taxes as well as the fact you either need to buy expensive vegetable oil or collect large amounts of used oil from disparate places. For personal use the taxes are avoided and you may be able to get sufficient used oil from a couple of restaurants or neighbors.
You're speaking with confidence you can't have, as you're using wording that makes it clear you've no actual experience.
StopTech doesn't understand that when biodiesel is manufactured properly, the hydrocarbon-chain-lengths are limited to the appropriate-for-that-specific-type-of-fuel lengths-range.
Used cooking-oil is chemically a mess & will void the warranties on engines, in its 1st use.
NO engine-manufacturer ought have to warranty ANY engine that has had random "fuel" burned in it.
That it'll "work", for awhile .. while wrecking sensors, gumming/laquering/carbonizing all kinds of things in the engine, enforcing that the engine-itself won't be able to perform properly soon .. that is a wartime-only "solution", in my eyes.
MentalEdge@sopuli.xyz you are right, on this one, I hope readers of this page see.
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I'm only speaking from what I have read. Apparently it is perfectly fine to run engines on biodiesel from using cooking oil or diesel from used motor oil as long as you have a good filtering process using a centrifuge. And I'm not saying that everyone will be able to save or make money this way, just that it's something one could explore and at least limit the amount of tax they give to a corrupt government.
You're so fixated on taxes that you didn't even stop to consider the price of a centrifuge.
https://www.instructables.com/How-to-Build-a-High-Speed-Centrafuge/
Only necessary for filtering used oil, however
The best way to make a homemade centrifuge is to use an old washing machine or something like that.
lol do you really think that will work?
Plus a lot of assumptions.
Such as a homemade centrifuge being sufficient to produce lab-grade results.