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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

Recharge Wrap-up: Pikes Peak Honda CR-Z, Tesla's liquid-cooled cable

Honda will race a CR-Z hybrid in the Pikes Peak International Hill Climb. The car will use Electric SH-AWD, which probably means it will be using electric motors to power the rear wheels. Whether the Pikes Peak CR-Z uses the same powertrain as the upcoming Acura NSX or the 3.5-liter V6 with three-motor hybrid system used in the Acura RLX Sport Hybrid is still unclear. The car will also use Acura's Precision All-Wheel Steering (P-AWS) system. The CR-Z will be piloted by Tetsuya Yamano. Read more at Hybrid Cars, or, if you read Japanese, at Response. Tesla has introduced a thinner, liquid-cooled Supercharger cable. While the convenience of not having to "wrestle a good-sized snake into the car," as Elon Musk calls it in a shareholder speech, is wonderful, it could also allow for faster charging in the future. The liquid-cooled charging cable "also has the potential for increased power of the Supercharger long-term," says Musk. A cable able to withstand larger loads could mean shorter stops when it's time for a charge. Tesla has installed the first next-generation cable at the Mountain View Supercharger. Read more at Charged EVs. Smart is offering its Twinamic automatic dual-clutch transmission on more models in Europe. In addition to the 71-horsepower Smart Fortwo, the DCT will now be available in the 90-horsepower Fortwo and the 71-horsepower Forfour. In the Fortwo, the Twinamic DCT adds ˆ1,275 (about $1,437) to the price over the manual transmission, and is an extra ˆ1,425 (about $1,606) in the Forfour. The option of steering wheel-mounted paddle shifters as part of the Sport package makes driving the efficient microcar even more fun. Deliveries of the newly equipped vehicles begin at the end of July. Read more in the press release below. smart extends twinamic range for fortwo and forfour: Even more models with automatic transmission Stuttgart. Following in the footsteps of the smart fortwo with 52 kW/71 hp, the smart fortwo with 66 kW/90 hp and the smart forfour with 52 kW/71 hp are now also available with fully automatic twinamic dual clutch transmission. This costs an extra 1275 euros compared to the versions with 5-speed manual transmission (forfour: 1425 euros). This means that both model series now offer a choice between no fewer than nine engine/transmission combinations. Delivery of the new models will begin at the end of July 2015.

Best Large SUVs of 2024

When it comes down to large SUVs, there's more to consider than price and just how large it is. First, it comes down to what's underneath the skin. Some are built on a truck-like body-on-frame chassis — this would be the traditional, literal definition of an "SUV." Others use car-like, unibody construction, which would make them a crossover. What really matters, though, is how you use them. For most American families, a large three-row crossover is going to be your best bet. They have loads of passenger and cargo space, and deliver superior fuel economy, handling and ride quality than those big traditional SUVs. They're cheaper, too. On the other hand, those traditional large SUVs like the Chevy Tahoe and Ford Expedition are better-suited for more heavy-duty tasks like towing. Most now have bigger third rows than big crossovers, while extended-length versions like the Chevy Suburban have way more cargo capacity behind their third rows than everything but an airport shuttle. As for luxury large SUVs, they fall into those same two categories as well, with American choices mostly being truck-based. The pros and cons of choosing one over another are similar. Below, you will find our list of the best large SUVs broken down into three categories: large family crossover, large traditional SUV and large luxury SUVs, which comprise both construction types.  Best Large Family Crossovers  |  Best Large Traditional SUVs  |  Best Large Luxury SUVs Best Large Family Crossovers 2024 Honda Pilot Why it stands out: Exceptional storage and cargo space; unique second-row functionality; refined ride; versatile and capable TrailSport; advanced AWDCould be better: Subpar acceleration with lackadaisical transmission and engine response; so-so driver assistance tech Read our full 2024 Honda Pilot Review The Honda Pilot was completely redesigned for 2023. It maintains its predecessor's family-friendly packaging and overall focus, but it has injected a welcome sense of style (especially in the TrailSport pictured above) that makes it stand out much better from the big crossover crowd. The Pilot's restrained adornment and classic proportions are refreshing compared to the increasingly busy Kia Telluride, Hyundai Palisade and Subaru Ascent. Let's talk about practicality, though, which is ultimately the Pilot's best attribute.