COAST TO COAST ON HOMEMADE FUEL
(Page 2 of 3)
January/February 1982
By the Mother Earth News editors
BURNING JUST ABOUT EVERYTHING UNDER THE SUN
With that "East Coast or bust" attitude prevailing, the real reason for the event— demonstrating that alternative fuels have a place in today's energy-scarce worldcame to the fore all the more strongly. Probably the most popular gasoline substitute was ethanol, and many independent entrantsalong with such corporate giants as the Archer Daniels Midland Company—opted for that made-from-corn combustible to power their vehicles. Methanol, made from both coal and wood, was also a favorite, and was used by "little guys" and large corporations alike . . . including CONOCO/B.F. Goodrich, Ford Motor Company (whose Alternate Fuels Division helped sponsor several automobiles using both types of alcohol fuel), the Denver Research Institute (University of Denver), and the official entry of The 1982 World's Fair.
As we mentioned earlier, there were four wood-powered entries (MOTHER's included), and the coast-to-coast journey provided an excellent opportunity for the biomassburners to compare notes and give their machines a nearly nonstop "do or die" acid test under a variety of climatic conditions. There were also diesel-engined contenders, and the drivers of those vehicles (among them a turbocharged Peugeot-engined Jeep) used various kinds of vegetable oils to power their creations. (Future Fuels Challenger Doug Malewicki—designer of the California Commuter featured in issue 3 of the Experimental Vehicle Newsletter —fitted his highly aerodynamic tri-wheeler with a 6.4-horsepower Lombardini diesel engine supplied by MOTHER's researchers, and managed to squeeze an average of 145 miles from each gallon of specially blended fuel. Since Doug's car was an unofficial entry, however, he left the rally at Phoenix, having proved his point.)
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WHAT DID WE LEARN?
At the time of this writing, the Future Fuels Rally sponsors have not yet declared an overall winner, pending the calculation of a vehicle-weight-IBTU-consumed ratio for each entry . . . a figure that most contestants agree—given the less-than-perfect conditions under which the event was held-will likely be an educated estimate at best.
At any rate, whether there's one victor or 20, the members of MOM's research crew (B.V. Alvarez, Robyn Bryan, Norman Holland, Don Barrett, and John Vogel) learned some valuable lessons from their experience with the ethanol-fueled van, the woodburning pickup (which, by the way, utilized a dual-fuel carburetor with alcohol as the reserve source of energy), and our ethanol-powered Ford truck, which went along to rack up some more test miles and to serve as a fuel carrier.
Here are the facts: Both alcohol-powered vehicles performed exceptionally well, save for a minor filter problem on the Ford. (It was a blessing in disguise actually, since it forced us to use a different type of filter—a corrugated undersink, paperelement, water-straining cartridge—which, as it turned out, performed better than anything we'd tried previously.) Furthermore, the trip allowed us to chalk up some final observations on the recent camshaft modifications that we'd made to enhance the alcohol-powered vehicles' performance during off-idle and midrange operation.
In a nutshell, the best-behaved cam, measured at 0.010" tappet travel, had the following specifications: Intake valve open at 6° Before Top Dead Center, and closed at 41 ° After Bottom Dead Center . . . exhaust valve open at 57° Before Bottom Dead Center, and closed at 3° BTDC . . . and a lift of 0.425" for both the intake and exhaust valves. (For those who might not wish to purchase a new camshaft with these specifications, Larry Wallace at Holman & Moody—Dept. TMEN, Box 19065, Charlotte, North Carolina 28219—is prepared to regrind stock cams to order.)
As far as our woodburning vehicle was concerned, our lessons were even more rewarding. Besides finding out that wood smoke and ethanol make perfect companion fuels (both are slow-burning, perform best under high compression and with advanced timing, and thus function well in the same engine), we learned that certain kinds of wood—such as the ponderosa pine commonly found on the West Coast—don't compare favorably with our old standbys, scrap yellow pine and oak, because of the western wood's high ash content and low gas quality. In fact, at the start of the trip, the research crew had to fabricate a larger filter to contend with the increased amount of ash created by the inferior fuel .. . but even with these last-minute problems, the 454-cubic-inch Chevy-working at a 12-to-1 compression ratio and capable of traveling at speeds up to 80 MPH-covered upward of 100 miles on each of its 150-pound fuel loads before stopping for a refill.
Later on in the trip, in the cold climates of Denver and Omaha, excessive condensation proved to be another bugaboo, since it shortened the intervals between necessary filter cleanings. We're currently designing a centrifugal extractor that should eliminate this problem.
All in all, we've concluded that our time and effort were well spent .. . if not because we'll reap an outright reward, then at least because we helped to prove that alternative fuels aren't merely a pipe-dreamer's fantasy.
