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Honda patents engine with different cylinder displacements

A basic rule of engine design states that the displacement of a cylinder is equal to the engine's total displacement divided by its cylinder count. Honda, according to a recently surfaced Japanese patent, is looking to break that rule with an engine containing cylinders of different sizes. We've done our best to translate it from patent-ese. The idea is that different-sized combustion chambers give more flexibility when any combination of cylinders are deactivated, or rested. Because the different numbers can be combined in various ways, it provides more and smaller increments than would an engine with equal-displacement cylinders. Take a 2.0-liter four-cylinder, for example. Following the golden displacement rule, each of the four cylinders has a volume of 500 cc, giving displacement increments of 500 cc when any cylinder is deactivated. But suppose instead that the four cylinders displace 300, 425, 600, and 675 cc, respectively. This would give the engine 15 available displacements instead of just four, and the spacing between each option would be far less than 500cc. As a result, those different virtual displacements would provide more adjustment between power and efficiency than a cylinder-deactivation system can on a conventional engine. Honda's patent describes cylinders with equal bore size, with the displacement from cylinder to cylinder varying based on the crank throw radius – the longer the throw, the longer the stroke and the larger the displacement of that particular combustion chamber. The patent describes how the cylinder sizes would need to be arranged to spread the load on the crankshaft and presumably limit vibration that would be introduced by the different pulse magnitudes. If we're interpreting things correctly, the largest cylinder (the one with the longest crank throw radius) sits in the middle of the bank with the smaller ones alternating on either side as they decrease in displacement. This concept is described for multi-cylinder inline and V-type engines of various sizes. The patent was filed in March of 2014 and published in January of this year. Whether or not this arrangement will reach production is of course unknown, but the advantages in terms of both efficiency and power seem promising. Related Video: News Source: Japan Patent Office via Auto Guide Green Honda Fuel Efficiency Technology patent

Junkyard Gem: 2000 Honda Passport 4WD

The suits at American Honda Motor Company must have spent the bulk of the 1990s tearing out their hair in frustration as their rivals raked in big money from the sales of ever-more-profitable SUVs, even as American car shoppers lost interest in sedans and hatchbacks. Oh, sure, the Civic-based CR-V appeared here for the 1997 model year and sold well enough, but the lack of a larger SUV pained Honda more with each passing year. With the Acura MDX and Honda Pilot not ready for showrooms until the 2001 and 2002 model years, respectively, some stopgap had to be found. Isuzu stepped up and made a deal with Honda: the Rodeo would get Honda badges and become the Passport, while the Trooper would show up in Acura showrooms with SLX badges (for the 1994 and 1995 model years, respectively). Here's one of those Passports, found in a Denver-area self-service yard. Things got even weirder in the Isuzu/Honda world around the turn of the century, with the Honda Odyssey getting Isuzu badges and being sold as the Oasis. Fast-forward to 2009, and the only Isuzu-badged vehicles available new here were rebadged Chevrolets: the I-Series pickup (Chevy Colorado) and the Ascender (Chevy Trailblazer). The Passport name has some interesting American Honda history, stretching back to the first Honda vehicle sold here (and the biggest-selling motor vehicle in human history): the Super Cub. American Honda Motor Company couldn't use the Super Cub name on our shores, because Piper Aircraft had been selling a small plane called the Super Cub since 1949, so the motorcycle was called the Honda 50 over here. Eventually, this bike got a 70cc engine and became the Honda C70 Passport, sales of which continued through the middle 1980s. That means the Passports sitting in your local Honda dealership right now got their name from a one-cylinder motorcycle. General Motors has a Passport connection as well; when GM created the Geo brand to sell rebadged Isuzus, Suzukis, and Toyotas in the United States, it created a marque called Passport to sell the Daewoo LeMans as the Optima in Canada (all the other vehicles sold by Passport dealers were Isuzus). So, Honda's need to offer SUVs in its American dealerships led to an arrangement with GM-connected Isuzu to sell these trucks with a model name bearing links to both companies. So much history in the junkyard! Just as Geo-badged Toyota Corollas (mostly) got Delco radios, so did the Passport get Honda radios.

Car Club USA: CleanMPG Northwest Rally

Car Club USA heads to Los Angeles for the CleanMPG Northwest Rally, where a group of like-minded hypermiling enthusiasts led by Wayne Gerdes attempts to drive from Los Angeles, CA, to Bend, OR, on one tank of fuel. For this challenge, Wayne tapped some of the most accomplished hypermilers in the world, including Guinness World Record holder Bob Winger and Mike Sefton, "the most fuel efficient driver in all of Canada." It doesn't take long for the competition to get heated. "They're not aggressive enough, and it's not going to save them anything by being soft right now," says Gerdes as the group attempts to navigate the Interstate traffic. "Driving in Los Angeles is a hyper miler's nightmare," says Winger. The trip will challenge both car and driver, while putting the latest fuel-efficient tech to the test. Wayne is piloting the Volkswagen Golf Sportwagen TDI, Sefton drives the Audi A3 TDI, and Winger attempts the trek in a Honda Accord Hybrid. It's diesel versus hybrid tech on this fuel-efficient trip of a lifetime. Each Car Club USA episode features a different car club or event from across the US, where passionate owner communities gather to share automotive experiences and embark on incredible adventures. From Main Street cruises to off-road trails, catch all the latest car club activity on Autoblog. Green Audi Honda Volkswagen Alternative Fuels Fuel Efficiency Green Culture Green Driving Driving Diesel Vehicles Hybrid Car Club USA Videos Original Video cleanmpg