Re: 91 International Wayne
In your research on the 7.3 engine, did you look up commentary on how will it does on WVO? The 7.3 has a rotary injection pump. My feeling is that the Bosch style inline pumps are better for WVO. I recently met a guy who destroyed the IP on his 7.3 by running unheated WVO. He claimed that he was able to do this successfully with the Bosch pump. Now, in my opinion you should not be running unheated WVO, period. But it's interesting that the rotary pump died and not the inline pump.
Another thing to consider: I have a Ford F250 with the 7.3 engine, and have not done a WVO conversion on it yet, but I have noticed one thing of interest. I run 100% biodiesel in warm weather, and the 7.3 is fine with that. But when the weather gets below 50 degrees it takes a bit more cranking to get it started on the B100. If I blend with regular diesel, it's fine.
Bottom line: I question whether the 7.3 is truly happy burning WVO/Biodiesel. I've heard that it should be good due to the Indirect Injection. But the IP itself may want a higher cetane value, or thinner fuel, or something like that.
My comments are far from scientifically verified and are based purely on anecdotal evidence; so take it with a grain of salt. Maybe the 7.3 is just fine for WVO. But I wanted to give you something to think about, and encourage you to do further research on the WVO/Biodiesel forums where there are more knowledgeable people.