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Originally Posted by anthology
WVO has to be filtered, then heated in some way before it gets to the injectors. I hear they get coked up though.
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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.
So, even at full chat with a lot of oil passing through the supply lines, there's certainly enough energy to heat that small volume of oil to +150°F before it is injected. I will be adding fuel heaters and a boost pump to the cars but that is only for pushing clouded oil to the IP prior to getting the engine up to temp.
My wagon had about 2000-3000 miles on a set of freshly rebuilt injectors when I changed to running a WVO/biodiesel blend. My plan is to continue running the WVO blend (when the temps drop I may have go to a 70% WVO/30% diesel blend to lower the oil's cloud point) to about 10,000 miles. At that time, I'll pull the injectors and analyze their condition.