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[Pu241]

Jrated,

You need to read read the following:
Mixing WVO with #2 Diesel


As for acids in WVO, yes they are there, and if you are concerned they can be water washed from the WVO. This does make for a more complicated processing avenue, but it can be done! On the other hand the acids are generated when the oil has been over heated, the oil is generally black and has a burned smell to it. So if you can source oil that is not overly abused this will also reduce the amount of organic acids in the oil!

As for OMCUSNR_RET's assertion, that using WVO generates acrolein (spelled correctly) I refer to The Handbook of Solvents to provide us with some facts.
Acrolein
Formula: CH2CHCHO
Flash point: open cup 0 degrees F
Flash point: closed cup -15 degrees F
Boiling Point < 53 degrees C

I find it hard to believe that a properly tuned engine is going to generate materials that fall apart at zero degrees F. When the combustion process produces temperatures in excess of 1000 degrees C.
If WVO does this, then I suspect that Bio diesel, basically a methyl ester has similar potential.
Now at startup is a different issue my guess is you don't want to breath any of the exhaust products of startup; diesel, Bio-diesel, or WVO.

Just to let you sleep better, apparently Acrolein is used to manufacture: disinfectants, soap, in coffee roasting, perfumes, plastics, and fat rendering.
Source: The Handbook of Solvents
Additionally from a google search of acrolein we find it is produced when cooking oil is overheated and in cigarette smoke.

So once again I ask for OMCUSNR_RET's references for WVO used in a diesel motor producing Acrolein.

John