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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 delays JDM Legend over quality concerns

Honda has been having some quality issues lately, to say the least. Most of those have revolved around the airbags supplied by Takata, but not exclusively. The new Fit Hybrid, for example, has been subject to five consecutive recalls in the year since it launched. And now the Japanese automaker is reportedly delaying the launch of its new Legend sedan. The Legend, for those unfamiliar, is what Honda calls the Acura RLX in the Japanese Domestic Market – a model that has been subject to a handful of recalls in the United States, affecting components ranging from headlights to seatbelts to suspension bolts. Such quality control issues have prompted Honda to delay the introduction of its flagship sedan in its home market, pushing its arrival in Japanese showrooms back from the fall (when the model was revealed) initially to January 22 and now to February 20, according to the report from Bloomberg. The extra time is earmarked the give Honda engineers the opportunity to look into potential problems with the vehicle's radar safety system and its advanced hybrid powertrain, before introducing it to the local market. Hopefully further recalls can be avoided once deliveries have commenced.

Honda may recall up to 1M vehicles for airbag issue, following Toyota's lead

It seems Toyota won't be the only one recalling the faulty Takata airbag inflators for long. Honda insiders in Japan claim that the company is getting close to announcing its own worldwide campaign that would begin before the end of June.
Unnamed sources close to Honda in Japan tell Automotive News that the company is pursuing an internal investigation into possibly affected models and is working with Takata to gather more information. They claim that it could involve even more than the 1.14 million cars worldwide that the automaker covered under the first recall for the problem in April 2013, including 561,000 vehicles in the US.
Toyota jumpstarted this process last week when it recalled over 2 million cars worldwide, including 844,277 in the US. Soon after, the National Highway Traffic Safety Administration began a preliminary evaluation into the issue following six reported incidents, and started assembling data about potentially affected models from Toyota, Honda, Mazda, Nissan, Chrysler. NHTSA also began investigating Takata itself.