I should take a moment to describe the Lovecraft Biofuel conversion done on our bus. To safeguard against any particles that might bypass the filtration system, an additional inline fuel filter causes the engine to stall when clogged, preventing potentially irreparable engine damage. This inline filter came in handy when we broke down in Utah and merely needed to clean it to continue to Colorado. Additionally, the fuel filter was replaced with a heat exchanger, tapping directly into the coolant line, utilizing waste heat to preheat the vegetable oil. Other than changing out a couple of supply lines, the only other significant changes were the addition of an inline fuel pump to improve efficiency when the engine started from cold, and a return line to pump excess fuel back into the tank, further heating the cold oil by mixing it with already hot oil. This conversion allowed for the use of biodiesel, petrodiesel, or waste vegetable oil.
In addition to our objectives of designing and operating our filtration system, recycling waste vegetable oil, and exploring our country, we volunteered at music festivals, allowing us free admission and a chance to continue our green footprint. Our first music festival was Rothbury 2008, in Michigan, designed to be one of the first environmentally friendly, sustainable festivals. We were part of the “Green Team,” in charge of ensuring as close to zero-waste as possible by directing people where to toss their respective refuse as either compostable, recyclable, or landfill.
Our journey from Boulder to Rothbury took about three days, exceptionally longer than anticipated due to underestimated oil-collection stop times, further refinement to our system, and a few scenic stopovers in Omaha, Nebraska, Davenport, Iowa, and Kalamzoo, Michigan. We enjoyed a rinse off in the largest bath of the summer, Lake Michigan. We were even graced with the unforeseen delivery of free, hot coffee drinks fresh to our bus door one morning after an overnight stop in York, Nebraska.