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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 previews S660 roadster ahead of Tokyo debut

Honda isn't known for making convertibles. In fact, legend has it that old man Soichiro banned them from his lineup - but then he also didn't approve of six-cylinder engines, either. There have been exceptions, like the Civic del Sol and S2000, and today Honda has revealed another.
Set to debut at the forthcoming Tokyo Motor Show in late November is the Honda S660 concept, a compact little roadster about which Honda is saying even less. It looks about the size of a Kei car, with a nameplate that suggests a 660cc engine, making it more of a revival for the 1990's Beat than the high-end S2000. And while there are some clear similarities with the EV-STER concept that debuted two years ago in Tokyo, the S660 looks closer to production-ready, with key features like an actual steering wheel.
Of course, whether the S660 makes production, and beyond that makes it off of the Japanese islands and across the Pacific to US showrooms, is another matter, but we could see something like this taking the fight to the Mazda MX-5 and even the Scion FR-S and Subaru BRZ if it did.

22,000 Honda Shadow 750 motorcycles recalled [UPDATE]

Update: Honda's statement on the recall is now embedded below. The Basics: Honda will recall 22,142 examples of its 2010-2016 VT750 Shadow motorcycles, including the 2012-2014 VT750CA, VT750C2 and VT750C2F; 2011-2016 VT750C; 2013-2016 VT750CS; 2010-2016 VT750C2B; and 2013-2014 VT750C2S. The Problem: Engine vibration can cause a wire for the bank angle sensor to rub against the joint connector on the wire harness. This can eventually cause a loss of the signal, and the engine could stall. Injuries/Deaths: None reported. The Fix: Dealers will replace the bank angle sensor and move the joint connector. If You Own One: Honda expects the recall to begin February 19. More Information: Documents from the National Highway Traffic Safety Administration (as a PDF) report Honda received five warranty claims and five field reports about this issue as of December 14, 2015. Related Video: RECALL Subject : Engine Stall from Loss of Sensor Signal Report Receipt Date: DEC 23, 2015 NHTSA Campaign Number: 15V874000 Component(s): ELECTRICAL SYSTEM Potential Number of Units Affected: 22,142 All Products Associated with this Recall Vehicle Make Model Model Year(s) HONDA VT750 2010-2016 Details Manufacturer: Honda (American Honda Motor Co.) SUMMARY: Honda (American Honda Motor Co.) is recalling certain model year 2012-2014 VT750CA, VT750C2 and VT750C2F, 2011-2016 VT750C, 2013-2016 VT750CS, 2010-2016 VT750C2B and 2013-2014 VT750C2S motorcycles. Engine vibration may cause the bank angle sensor wire to rub on the wire harness joint connector, resulting in a loss of the sensor signal. CONSEQUENCE: Without the bank angle sensor signal, the engine may stall while riding, increasing the risk of a crash. REMEDY: Honda will notify owners, and dealers will relocate the joint connector and replace the bank angle sensor, free of charge. The recall is expected to begin February 19, 2016. Owners may contact Honda Motorcycle customer service at 1-866-784-1870. Honda's number for this recall is JW7. NOTES: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov. American Honda Statement on VT750 Recall Honda has issued a Safety Recall of some 2010-2016 model-year VT750 motorcycles. It is possible that long term exposure to engine vibrations may cause the bank angle sensor wiring to break, or be damaged, which could cause the engine to stall and increase the risk of a crash.