Supermileage vehicle is all about the mpg, not the mph

Jun 05, 2013
BYU's supermileage vehicle is hoping to drive more than 1500 mpg at the SAE competition this week.

(Phys.org) —For most people, having a car that can clock 50 miles per gallon is a dream. For a group of BYU engineering students, anything less than 1,000 mpg is a disappointment.

The students have built a that needs only one gallon of fuel to travel roughly the distance from Utah to Michigan, which just happens to be the place they'll be this weekend for the SAE Supermileage Competition.

The annual event determines which university has created the most fuel-efficient vehicle in North America.

"It comes down to the smallest little details on race day," said Gary Ellingson, one of seven engineering majors who built the car. "At the end of the day, it's the team with the best run."

During the competition, every team is given about 20 grams of fuel to race around a 10-mile track. Each car has to average 15 miles per hour during the run, and then afterwards the is re-measured to see how much fuel was used. Judges then deduce the mpg capability based on the leftover fuel.

To maximize , the BYU team added ceramic insulation to the lawn-mower engine they were required to start with, and then increased the 8-to-1 engine compression ratio to 14-to-1.They also made the engine injected and modified it to be electronically controlled.

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"It's a cool project because you really see exactly how you get better mileage," said team member Caroline Sorenson, who is also the driver. "Now we understand better what you can do to a regular car to get better ."

BYU competed in the Supermileage competition for the first time last year and finished a surprising second place with a final mark of 1,135 miles per gallon.

This year's team is going for gold by focusing on both increased and reduced weight.

The 2013 version of the BYU Supermileage Vehicle weighs in at 99 pounds, 22 pounds lighter than its predecessor. Eric Wilcox, who oversaw the weight-loss plan, said they reassessed every element of the car to drop pounds.

"We shaved off five pounds by making our own starter, and we clipped another five pounds from switching the battery," Wilcox said. "If we could use or make something lighter, we did it."

The SAE Competition is slated for June 6-7 at the Marshall, Mich., proving grounds. Once there, the BYU vehicle must first pass an agility test and a strict technical inspection.

Then it will be off to the track to see just how far the car can go.

"Our plan is to get at least one qualified run in and then really push the limits of what the car can do," Ellingson said. "We're going for 2,000 ."

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Moebius
not rated yet Jun 05, 2013
Use a rope starter and magneto. Lose the weight of the starter and battery.
italba
5 / 5 (1) Jun 05, 2013
The actual fuel efficiency record for gasoline fueled cars (Shell eco marathon Europe) was set by a French team in 2003 called Microjoule with a performance of 10705 mpg-imp (0.026388 L/100 km; 8,914 mpg-US). With hydrogen fuel cells the record belongs to PAC-Car II, 0.0186 L/100 km (15,200 mpg-imp; 12,600 mpg-US) gasoline equivalence.
antialias_physorg
3 / 5 (2) Jun 06, 2013
We're going for 2,000 miles per gallon

Which is pretty cool, but they have quite a ways to go before they get a shot at the record.

For comparison: 2012 European winners (Microjoule-La Joliverie, France) got 6664mpg. (Around the world with 4 gallons of fuel? Boggles the mind just to think about it)
The freaky thing is that that wasn't even a Univerity team - it's a school team. Best university team got in second place (GAMF, Hungary with 6341mpg)