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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

2020 Hyundai Palisade vs. Ascent, Pilot, Highlander and CX-9: How they compare on paper

We've finally had our first drive of the 2020 Hyundai Palisade and found it to be well-equipped for sales success. It nails the formula that some of the most successful three-row crossovers have, the aforementioned seating capacity, high driving position, all-wheel-drive availability and a V6 engine. Of course, it also offers a unique and menacing-looking exterior that ought to stand out in the parking lot. To dig deeper into how it compares to other three-row family crossovers, we've fired up the old Autoblog Comparo Generator 3000 (™) and lined the all-new 2020 Palisade up against the 2019 Subaru Ascent, 2019 Honda Pilot, 2019 Toyota Highlander and 2019 Mazda CX-9. Besides being two of last year's best-selling three-row SUVs, the Pilot and Highlander are also the closest in general concept to the new Palisade, while the Ascent and CX-9 also offer a comparable turbocharged four-cylinder powertrain. The CX-9 is also one of our favorites in the segment, and the Ascent is one of the newest entrants on the scene. There are of course numerous other worthy contenders, including the Chevrolet Traverse, GMC Acadia, Volkswagen Atlas, Nissan Pathfinder, Hyundai Santa Fe and the best-selling Ford Explorer, so if you want to see their specs, check out the Autoblog compare tool. Performance and fuel economy The Subaru, as is so often the case, is the oddball. It has a 2.4-liter turbocharged horizontally opposed four-cylinder (aka a flat-four or a boxer-four) that produces a comparatively modest horsepower rating, but a greater amount of torque. That's typical for turbocharged engines such as Mazda CX-9's turbo inline-four that produces 250 horsepower on premium fuel (227 hp on 87 octane) and 310 lb-ft of torque (the VW Atlas also offers a base turbo-four). The Hyundai, Honda and Toyota, meanwhile, go about it the old-fashioned way, with naturally aspirated V6 engines displacing 3.8 liters in the Hyundai, and 3.5 liters with the two Japanese crossovers. The Toyota and Hyundai lead the pack in horsepower, with the Toyota taking top honors by just 4 horses. The Honda weighs less, though, so their acceleration should be comparable. The Subaru actually accelerates on par with its V6-powered competitors, probably due in part to its continuously variable transmission. The fuel economy trophy goes to the Ascent.

NHTSA opens safety investigations into Toyota, GM and Honda crossovers

The National Highway Traffic Safety Administration is evidently keeping itself very busy these days, as the federal agency has just announced it is launching or renewing investigations into Toyota, Honda and General Motors crossovers.
2006-2008 model year Toyota RAV4 crossovers are under review for allegations of rear tie-rod rust which can result in failure. NHTSA also said it is probing some 35 complaints about 2005 Honda Pilot models with inappropriate activation of the vehicles' stability control system. The alleged malfunction can cause the vehicles to slow down or stop in bad unsafe situations. At the moment, NHTSA is reviewing a petition regarding the Pilot issue, a move that will determine whether it needs to open a full-blown investigation.
In addition, Saturn Outlook and GMC Acadia three-row crossovers built in 2007-2009 are getting looked at for "loss of low beam headlamp" function. One complainant said the wiring in his Outlook overheated and melted. NHTSA says it has received 415 complaints about the problem and a GM spokesman confirmed that the automaker already started a "Customer Satisfaction Program" in December to address the issue.