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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 Civic Type R caught naked and frisky

Honda's upcoming Civic Type R is one of our most anticipated models of the next year - and we probably won't even get it in North America. And yet, each time we see it, the five-door just seems so menacing and purposeful. An all-but-undisguised version has just been spotted by our photographers testing on the back roads in Germany. If this signals what to expect, then the project appears to be coming along nicely.
Compared to the concept shown at the Geneva Motor Show, this prototype looks even meaner. Check out those big, blistered front fender extensions, taller wing, deeply sculpted front air dam and 10-spoke gold wheels. The Type R certainly certainly isn't hiding its performance intentions, and it has no reason to. Under the hood, we know it packs Honda's new 2.0-liter turbocharged four-cylinder pumping out 276 horsepower, which is likely connected to a six-speed manual.
Now, if only Honda could find some way to get this machine across The Pond and into the our hot little hands. There has already been an online petition begging the Japanese automaker to find a way, and after recently enjoying an all-too-brief prototype drive, we're ready to sign up.

Next-gen Honda Accord PHEV may have 39-mile EV range [UPDATE]

UPDATE: Disregard what The Asahi Shimbun said on this. The paper apparently conflated the upcoming Clarity-based PHEV and the non-plug Accord Hybrid and has since updated its article. We got an email from Honda clarifying the situation: The refreshed Accord Hybrid, slated to launch in the middle of this year, will not have a plug-in variant. Honda will bring a new, dedicated plug-in hybrid to market by 2018 that leverages the same platform that underpins the upcoming Clarity Fuel Cell. This new PHEV will feature more than triple the 13-mile electric range of the last generation Accord Plug-in Hybrid. We apologize for the error. Honda's next-generation Accord Plug-in Hybrid could triple the previous model's electric driving range when the new one debuts in the US in 2018. To achieve such a significant improvement, the company would equip the PHEV with a higher capacity battery of the same physical size and more efficient electric motors, according to the The Asahi Shimbun. The next Accord PHEV could drive the equivalent of 68 miles in EV mode, the newspaper claims. However, we believe this figure comes from the Japanese test on electric models, which produces higher figures than the US evaluation. Tripling the 2014 Accord Plug-in's EPA-estimated 13-mile range suggests a number closer to 39 miles when the new generation reaches this country. A figure around 39 miles would still make the 2018 Accord a contender among the current PHEV sedans. For example, the EPA rates the Hyundai Sonata Plug-in at a 27-mile range and estimates the Ford Fusion Energi at 20 miles. The latest Chevrolet Volt, which would likely be smaller than the Honda, wins out with 53 miles of driving distance, though. Honda plans a new pure EV and PHEV in its US lineup by 2018, and the plug-in shares a chassis with the upcoming FCEV fuel cell sedan. The next-gen Accord would give the company another flavor of PHEV to offer customers, too. American Honda Motor Executive Vice President John Mendel told Autoblog last year the company would update the standard Accord Hybrid in 2016 and introduce the next PHEV variant here in 2018. Related Video: