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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

2017 Honda Ridgeline First Drive

Over the years, the quest to build a better pickup truck has resulted in nothing but failure. Only one basic formula has proven successful: body-on-frame, front-engine, solid rear axle, and an optional transfer case for true four-wheel drive. And it helps to wear an American nameplate. The 2017 Honda Ridgeline is none of those things. Instead, it's a unibody. The engine is up front, but it's mounted transversely since the truck is based on front-wheel-drive architecture. And one look is all it takes to confirm the Ridgeline is not a Ford, Chevy, or Ram. In the face of ever-bolder and blockier competition, the Ridgeline looks, dare we say, aerodynamically sound. It's all based on the rational desire for greater efficiency, comfort, and convenience. In the same way that a car-based crossover is a better choice for most families than a truck-based SUV, the Ridgeline is a better choice for a large swath of pickup buyers. It really is more comfortable, more fuel efficient, roomier, and easier to live with than its primary competitors. Those same things could be said of the old first-gen Honda Ridgeline. But where the 2006 model was terribly unattractive and ambiguously styled, the new 2017 model is at least recognizable as a pickup. Gone are the buttresses of the old truck, replaced by a more traditional bed that is four inches longer than before. That bed is molded from a strong, dent- and scratch-resistant fiber-reinforced plastic material that's UV treated so that it doesn't need paint to keep from fading in the sun. A pair of dirtbikes or a single ATV fit nicely with the tailgate down. There's still a trunk recessed in the rear of the bed, complete with a drain plug so that it can be hosed out or filled with ice to keep drinks cold. Eight tie-downs come standard, each rated to hold up to 350 pounds. A power outlet is nestled behind a hidden door in the bed, but a two-prong design and 400-watt max rating limit its usefulness. Carried over from the first generation is a dual-action tailgate that can fold down or swing open, hinging on the driver's side. A new feature is an in-bed audio system that should prove a hit at tailgate parties. Plug a television into the in-bed outlet, connect to the car's audio system, dump some ice in the trunk, and you're good to go. Check out the innovative tailgate and in-bed audio in our Short Cut videos below. And stick around for the third video to see a load full of rocks dumped in that heavy-duty plastic pickup bed.

2021 Hyundai Elantra vs. compact sedans | How they compare on paper

Despite the rising popularity of crossovers, the sedan market remains packed and fiercely competitive. It looks like it will stay that way with the introduction of the strikingly redesigned 2021 Hyundai Elantra. And since Hyundai was kind enough to provide plenty of specifications on the new car, we figured we ought to see how it stacks up to some of the latest and greatest small sedans on the market. For this comparison we picked the two best-sellers, the Honda Civic and Toyota Corolla, one of the other recently redesigned sedans, the Nissan Sentra, and a perennial enthusiast favorite, the Mazda3. Below you'll find a chart with all the raw numbers for your perusal. Following that will be our usual break down and analysis of the numbers and any other noteworthy features not included in the chart. Performance and Fuel Economy While the design and chassis are all-new on the Elantra, the base powertrain isn't. It uses a version of the naturally aspirated 2.0-liter four-cylinder shared throughout the Hyundai and Kia line-ups, and it's again paired with a CVT. With 147 horsepower and 132 pound-feet of torque, it's the second least powerful entry for conventionally-powered sedans, only ahead of the sluggish 1.8-liter base engine in the Toyota Corolla. For those looking for a peppy small sedan, the Mazda3's naturally aspirated 2.5-liter has the most power and torque, even ahead of the turbocharged Honda Civic's 174 ponies. On the other hand, the Elantra, which Hyundai says will have better fuel economy than the outgoing model, should get at least 36 mpg combined, and probably better, making it the most efficient non-hybrid of this group. For the best blend of power and efficiency, the Civic is likely the way to go, as its turbo engine can return 36 mpg combined in lower trims. If you want a manual transmission in this body shape, only the Civic and Corolla offer it. A manual transmission is available on the Mazda3 hatchback, and the turbo Civic can also be had with a manual in hatchback or Si forms. A new powertrain for the Elantra is the hybrid. It's unique compared to other hybrids in that it's coupled to a six-speed dual-clutch transmission, rather than an electronically controlled CVT (which is not the same thing as a CVT) or something too complicated to describe in this sentence (the Honda Insight).