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Originally Posted by R Leo
Sure WVO has to be filtered, but the stuff is damned near free and around here, B100 is $3.40/gallon and diesel is in the $1.90-2.05 range. Worth the effort and trouble, I think. Using WFO also makes a subtle political statement.
Heating WVO? Maybe for pumping from the vehicle tank, but I'm not so sure about the necessity of heating for proper injection and reduced coking. Here's why: a running engine conducts a fair amount of heat into the injector body...my non-contact thermometer indicates ~200°F when aimed right at the point where the injector screws into the precombustion chamber and, enough heat is conducted into the high pressure supply line to maintain a 150° to 170°F temp in the line.
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I was always under the impression that WVO clogged the injectors, burned incompletely, and was overall, just a mess to deal with. Of course, it is free (or nearly so) and that's a major plus, as well as the fact diesels can run satisfactorily off of them, just didn't know it was very healthy for the engine. Then I think there is the whole 'scavenging' aspect and percieved difficulty in its use on a regular basis. For a DIY'er, none of this poses a problem. Get into the real world, with regular people that want to pump and go and you open a new can of worms.
In your current setup, does the oil cloud so easily (or often) that a heater would be required to even get it from the tank? That would be my worry. The whole 'wire/plumb it up to switch tanks' would be a hassle for me. That is why I asked about B100 because it is locally available and I wouldn't have to go through the pouring and filtering etc.