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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

1964 Honda SM600 roadster gets elemental in Jay Leno's Garage

Honda has made a handful of sports cars in the past, with examples like the Acura NSX and Honda S2000 standing as noteworthy examples. But before either of them came along, there was the Honda S600. And Jay Leno has a beautiful example from 1964 in his garage for this latest video installment. The inspiration for the new JDM S660, the original S600 came out in 1964 – which just happened to be the same year that Honda broke into Formula One. And you can hear that relationship when the dual-chain-drive 600cc inline-four revs up to its 9,500-rpm redline. It may not have had the power of contemporary British roadsters from MG and Triumph, but it had plenty of character. When Leno got a hold of this one – a top spec SM model – he and his team took it apart nut and bolt, powder-coated the chassis, resprayed the body and put it all back together better than new. But you'll want to hear Jay tell the story himself in this fifteen-minute video clip. News Source: Jay Leno's Garage via YouTube Celebrities Honda Convertible Classics Videos Jay Lenos Garage

Honda CEO says we shouldn't expect any new sports cars

It wasn't so long ago that Honda was known for its sporty two-door models, with models ranging from the Civic del Sol to the Prelude and from the Acura Integra and RSX to the Honda S2000. But look at its range today and all you'll see are the Civic and Accord coupes. Honda has essentially let competitors like the Scion FR-S/Subaru BRZ and Nissan 370Z take the place it once claimed as its own. But if you were hoping Honda would fight back with a new coupe or convertible of its own, we're afraid you're going to have to downgrade those hopes to pipe dreams.
While in Japan ahead of the Tokyo Motor Show, Autoblog had a chance to sit down with American Honda CEO Tetsuo Iwamura (pictured at right). When we asked about the potential for a new sports coupe or convertible in the Honda or Acura lineup, he pointed to the current Civic and Accord coupes - not to mention the upcoming new NSX - but said that Honda has no replacement for any of the aforementioned models (or a rival for the FR-S or 370Z) in the pipeline, saying only that the company is monitoring potential demand.
What Iwamura-san did note was that he's a personal fan of the new S660 roadster (pictured above) set to be unveiled tomorrow, and he is pushing (or at least hoping) that it will come to North America. Given that he's head of both Honda's American office and its global automobile operations, one might think that the only person he would have to persuade is himself (well... himself, and potential buyers), but the sporty droptop looks to be about kei-sized, which sadly suggests that it may be too small for American tastes and perhaps not designed with US crash-test standards in mind anyway.