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Thats what I like to hear!
NO TITRATIONS!!!!!!!!!
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I second that. Thanks for all the info!!!!!!
By the way: are those units grams / liter?
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Yes.
Bear in mind it is grams of pure lye per liter of oil. Obviously the total reactant volume will be greater once you've added methanol into the picture at 15 to 25 percent, but the lye measurement pertains to the volume of oil only.
Don't be afraid to fudge on large volumes either. My system was about 114 gallons capacity and I usually measured for about 70-80 gallon batches. I used a clear PVC pipe on the outside of the tank as a gauge glass in order to note the volume in the reaction tank and measured in inches. I took the diameter of the drum and came up with the trig formula to get liters per inch to determine the amount of lye as well as a ballpark estimate of methanol required. I then dumped the lye in the standby tank along with the methanol and stirred it up until completely dissolved before transferring to the main tank.
If you look
HERE , one of the pages is a demonstration of my test batch. It was complete fudge on volume of oil and methanol and only semi-accurate on the lye measurement and it still came out perfect.
In all honesty, I think I'd stay well on the short end of lye and not worry about unreacted too much unless the weather was cold. Then again (note signature), I forgot what cold weather was and don't have to worry about it here. Some folks are diluting their #2 dino-D with as much as 50% filtered WVO and I haven't heard any complaints yet. I'd guess that the TDI's might be more sensitive to such things than the PSD's due to the type of fuel pump, but only guessing.
