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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

Recharge Wrap-up: Honda Legend Sport Hybrid launching in Japan; driving cross-country on chicken fat

Honda will begin sales in Japan of the Legend Sport Hybrid SH-AWD in January. The Legend is Japan's answer to the Acura RLX Sport Hybrid sold in the US. Up front, the new flagship sedan uses a 3.5-liter V6 with cylinder deactivation and a seven-speed, dual-clutch transmission with integrated electric motor. In the rear, a dual electric motor unit supplies power to the wheels. The three electric motors are also used for generating electricity during deceleration. The car has three drive modes, including EV Drive, Hybrid Drive and Engine Drive. The result is a fuel economy rating of 40 mpg, according to the JC08 cycle. Read more at Green Car Congress or in Honda's press release below. While Jay Leno explains how marketing early electric cars toward women caused them to lose out to internal combustion, the same can't be said about the current era of EVs. Leno says that early EVs, like Leno's beloved Baker, appealed to women because they were quiet, clean, and didn't require cranking to start them. This led to accessorization marketed toward women, causing men - who had more buying power than women at the time - to shy away from EVs. This time around, though, EVs target a broader audience in a different culture from the early 20th century. See Leno explain the early EV culture while driving his Baker Electric in the video below and read more at Hybrid Cars. GKN's two-speed eAxle allows EVs to make the most of both acceleration and top speed. Single-speed transmissions must sacrifice top speed for acceleration, or vice versa. In addition to improving performance at all speeds and increasing range, the GKN's eAxle also performs well in terms of NVH, providing seamless shifts and low gear noise. In order to package the eAxle in the BMW i8, the unit is just 12.8 inches by 22.1 inches by 12.3 inches and weighs 60 pounds. Read more at Green Car Congress. An alternative fuels researcher at Middle Tennessee State University will drive a truck powered by chicken fat biodiesel across the country. Professor Cliff Ricketts is driving a converted 1981 Volkswagen Rabbit pickup from Key West, FL to Seattle, WA to demonstrate the viability of chicken fat as a fuel. Ricketts admits, though, that the truck's exhaust stack is loud and smells like French fries. Read more at Domestic Fuel. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

2015 Acura NSX burns to the ground at the 'Ring [w/video]

Assuming all goes to plan, automakers test their vehicles to the breaking point in the months and years leading up to that vehicle's actual release into the public. Which is good, because it's much better for a car to break in glorious fashion in the hands of the company that produces it than in the driveway of an owner who just spent their hard-earned cash to get it. Such was the case with this production-guise Acura NSX prototype that we saw running around the Nurburgring just the other day. We can't be 100-percent certain, but the burned-out carcass is wearing the same number plate as the car that was spotted earlier, so it's likely the very same NSX. We have no idea what was the cause of the blaze that turned this Acura into the car-b-q you see pictured above, but our spy shooters on the ground in Germany say it was not involved in any collision, having caught on fire all on its own with engineers behind the wheel. The good news is that nobody was hurt, though the car is quite clearly a complete loss. We're sure there's another ready to to test in the burned car's place... just as soon as the engineers at Honda figure out exactly what went wrong. Have a look at the smoldering aftermath up above, and feel free to scroll down below to see a video of the car in much better circumstances.