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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

Honda CEO carless, waiting on Civic Type R

As chief executive of Honda, Takahiro Hachigo could get his hands on anything the automaker produces, or has produced: a new Acura RLX luxury sedan, a luxed-out Odyssey minivan, a top-of-the-line CBR sport bike... even an old NSX supercar. Heck, he could probably even get the skunkworks to cook him up a road-going version of the ten-cylinder HSV-010 that was supposed to be the new NSX but only ever ended up racing in Super GT. So what does he drive? "Unfortunately, I don't have a car now," Hachigo-san revealed to journalists during a roundtable discussion in Tokyo. That situation won't last forever, though: "There is a model I want, which will, as I have told you, be launched this autumn," said Hachigo. "I want to buy the Civic Type R." The Honda chief is referring, of course, to the company's new hot hatch that will be produced in the UK and exported around the world, including back to Japan. It's got a 2.0-liter turbo four pumping out 306 horsepower to send it to 60 in 5.7 seconds, making it one of the fastest and most powerful hatchbacks ever devised. And more than anything else the company makes, that's what Hachigo wants for himself. The news should be welcomed by performance enthusiasts who may have been concerned about the future of Honda's performance models. The company has a slew of them coming out, including the new NSX and Civic Type R, and may even produce another sports car to slot in between. Those, however, were spearheaded under the administration of Hachigo's predecessor, Takanobu Ito. But if Hachigo's stated driving preferences are anything to go by, he's got some high octane pumping through his veins as well. Until the Civic Type R starts arriving in Japan, though, Hachigo's garage will have an empty space in it, filled only by his wife's N-One kei car and his own VTR 250 motorcycle. We're sure his chauffeur has him well taken care of, though, in the back of an RLX or whatever else the company sends to pick up its new chief executive. Related Video:

Mid-engine Honda sports car surfaces in EU patent drawings

Based on new patent drawings, Honda clearly isn't done with sports cars. The design you see above was registered and published by the European Union Intellectual Property Office (EUIPO) and was first reported by AutoGuide. The drawings show a rakish, angular sports car design that is very clearly mid-engine. It could almost pass for a Lamborghini. But the name on the design is Honda Motor Company, and aside from the name, it bares a strikingly similar appearance to a mid-engine design found in a Honda patent two years ago. In fact, the only major difference between this car and the older one (seen below) is the lack of a windshield and top. The shape of the lights and the grille, as well as the front fender vent and character lines running from it, are reminiscent of the S660 kei roadster for Japan. The large, angular intakes look more related to the Acura NSX, though. View 6 Photos Unlike the previous patent renderings of the car, this one has an interior, and the inclusion of it may be why the top and windshield are absent. The interior also leads us to believe that this design is for an upcoming concept. The steering wheel is a small, rectangular piece similar to what you would find in an F1 car or Indy car. The seats also look like thin buckets designed to be as sporty and light as possible. A production version would probably have a bit more cushioning and a round wheel. It does look like there is a pushbutton transmission setup in the center console like current Acuras, though. So what does this mean? Honda is clearly still working on this design, and based on some of the more radical design choices for the interior, we're likely looking at a concept car that will show up in the next couple of years. Whether a concept will lead to a production car is tough to say. There's definitely room in Honda's global sports car roster between the S660 and NSX for something in between, and Honda has reported that it's getting pressure from dealers for sporty cars. The exterior design isn't so extreme it couldn't be tweaked for production, either. There have also been rumors that Honda is preparing a mid-engine hybrid sports car with the Type R's turbocharged four-cylinder. Honda also holds a trademark for the name "ZSX," which fits the naming scheme of the NSX and old RSX, but at least in Europe, Honda has held the trademark since 2009. We'll just have to wait and see what Honda does.