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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

Brand new cars are being sold with defective Takata airbags

If you just bought a 2016 Audi TT, 2017 Audi R8, 2016–17 Mitsubishi i-MiEV, or 2016 Volkswagen CC, we have some unsettling news for you. A report provided to a US Senate committee that oversees the US National Highway Traffic Safety Administration (NHTSA) and reported on by Automotive News claims these vehicles were sold with defective Takata airbags. And it gets worse. Toyota and FCA are called out in the report for continuing to build vehicles that will need to be recalled down the line for the same issue. That's not all. The report also states that of the airbags that have been replaced already in the Takata recall campaign, 2.1 million will need to eventually be replaced again. They don't have the drying agent that prevents the degradation of the ammonium nitrate, which can lead to explosions that can destroy the airbag housing and propel metal fragments at occupants. So these airbags are out there already. We're not done yet. There's also a stockpile of about 580,000 airbags waiting to be installed in cars coming in to have their defective airbags replaced. These 580k airbags also don't have the drying agent. They'll need to be replaced down the road, too. A new vehicle with a defective Takata airbag should be safe to drive, but that margin of safety decreases with time. If all this has you spinning around in a frustrated, agitated mess, there's a silver lining that is better than it sounds. So take a breath, run your fingers through your hair, and read on. Our best evidence right now demonstrates that defective Takata airbags – those without the drying agent that prevents humidity from degrading the ammonium nitrate propellant – aren't dangerous yet. It takes a long period of time combined with high humidity for them to reach the point where they can rupture their housing and cause serious injury. It's a matter of years, not days. So a new vehicle with a defective Takata airbag should be safe to drive, but that margin of safety decreases with time – and six years seems to be about as early as the degradation happens in the worst possible scenario. All this is small comfort for the millions of people who just realized their brand-new car has a time bomb installed in the wheel or dashboard, or the owners who waited patiently to have their airbags replaced only to discover that the new airbag is probably defective in the same way (although newer and safer!) as the old one.

Fernando Alonso tries out fast motorcycles and Senna's McLaren

Honda closed out its racing year yesterday with its annual Thanks Day at Motegi. The event brought out an array of competition machinery and the drivers and riders who race them. That included Fernando Alonso, but rather than bring his Honda-powered McLaren, the two-time world champ took the opportunity to try out some different equipment. While MotoGP rider Marc Marquez slipped behind the wheel of the NSX Concept GT, his countryman Alonso hopped on his RC213V motorcycle for a couple of laps. Fernando isn't the first racer to swap between F1 and motorcycles: Michael Schumacher tried his hand and motorcycle racing from time to time, Valentino Rossi tested Ferrari grand prix cars on numerous occasions, and of course John Surtees won championships in both spheres – but he remains the only one to have done so. Fernando also had the chance to drive a McLaren-Honda MP4/6, just like the one with which Ayrton Senna successfully defended his title in the 1991 Formula One World Championship. That was the first time McLaren ran a Honda V12, but the last time a V12 – or a manual transmission – won the championship. After the following season, Honda and McLaren parted ways – only to be reunited this year with Alonso and Button behind the wheel. While Alonso was toying around with Senna's car, Takuma Sato – who drove Hondas in Formula One and now in Indy – tried his hand at the 1968 Honda RA301. That machine was also powered by a Honda V12, but at 440 horsepower, was far less potent than the 735+hp version that would later power Senna's. John Surtees drove one just like this in the '68 world championship, retiring from most of the races on the calendar but scoring two podiums from the three that he did finish. Marquez and his teammate Dani Pedrosa also competed in the CBR250 spec race, rode the mid-80s-era NSR500 bikes. They drove in four-wheel spec race as well in modified Honda N-One kei cars. The event served to cap a full year of racing for the Japanese automaker, which competes in a range of racing disciplines including F1, Indy, Super GT, the World Touring Car Championship, and numerous classes of motorcycle racing. Featured Gallery Fernando Alonso at Honda Thanks Day 2015 View 11 Photos News Source: Honda via Autosport Motorsports Honda motogp