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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

10 automakers shack up in Detroit hotel to talk Takata airbags

Since Takata has decided not to take the lead concerning potential issues with its airbag inflators, the automakers have. Perhaps that's unsurprising, since it's the automakers, not Takata, that will take a beating on the dealership floor if consumers decide its models are a health hazards. The Detroit News reports that Toyota, Honda, General Motors, Ford, Chrysler, Mazda, BMW, Nissan, Mitsubishi and Subaru met in a hotel conference room near the Detroit Metropolitan Airport last week to sort out a way to understand the technical issues involved. So far, faulty airbag inflators have been ruled the cause of five deaths and 50 injuries around the world, but neither Takata nor investigators understands exactly why the inflators are malfunctioning. The National Highway Traffic Safety Administration recently asked Takata to issue a national recall, Takata declined, citing a minuscule failure rate and the fact that it's still investigating the issue. Toyota and Honda then made an industry-wide appeal for "a coordinated, comprehensive testing program" that would pinpoint the problem inflators and get them replaced, and that's what the Detroit meeting was about. Numerous issues, however, will make this a long row to hoe: simply getting the parts to replace the nearly 20 million inflators in cars recalled around the world so far - even working with other suppliers - will take a years, but more importantly, no one knows if the replacement inflators currently being installed will suffer the same issue. Answers will hopefully come quickly with Takata, the ten automakers and NHTSA all independently investigating the problem.

McLaren F1 team sets deadline for engine decision amid Renault speculation

BUDAPEST - McLaren says the next five weeks will be the key to deciding which engine it will use next season, with speculation mounting that the former world champions could ditch Honda and switch to Renault. Chief operating officer Jonathan Neale told Reuters at the Hungarian Grand Prix that "everybody is talking to everybody," but time was running out. "We've got to land those decisions in the next four or five weeks," he said, speaking from a design perspective and because drivers like McLaren's Fernando Alonso were waiting to see what engines teams had before committing to new deals. "I think there is a solution out there for everybody and I hope it's one that will be able to retain Fernando in this team." McLaren scored their first double-points finish of the season in Budapest on Sunday with double world champion Alonso finishing sixth, a day after his 36th birthday, and Belgian Stoffel Vandoorne 10th. The nine points lifted McLaren off the bottom of the standings just before the August break and factory shutdown, a result that Neale compared to scoring a goal before halftime. Alonso's future is a key concern, with the Spaniard out of contract and saying McLaren needs to provide a competitive car to keep him. Honda's power unit has been beset with problems since the partnership started in 2015, the engine neither reliable nor competitive. Hungary, the slowest permanent circuit on the calendar, reduced those shortcomings, but the next two races in Belgium and Italy are two of the fastest, where engine horsepower is of critical importance. McLaren is Honda's sole team in Formula One. A proposed partnership with Sauber terminated last week with the Swiss team choosing to stay with Ferrari. A split from McLaren could force the Japanese manufacturer out of the sport, but Neale hinted at an alternative. "You'll have seen the media speculation that there's discussions with Toro Rosso," he said. Toro Rosso use Renault engines, but a switch to Honda — which could bring welcome funding to a team whose Red Bull parent has considered a sale in the past — would free the French units for McLaren. The Renault engine has won a race this season with Red Bull and could satisfy Alonso, who won both his titles with the French manufacturer. The other alternatives to Honda are Mercedes and Ferrari, but Neale recognized that putting a Ferrari engine in a McLaren, the Italian team's historic arch-rivals, was highly unlikely.