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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

Remembering the glory days of the Honda Civic Si

In addition to watching host John Davis slowly age over his decades on the show, MotorWeek's Retro Review series on YouTube allows us to look back on some of the favorite models of yesteryear to see their evolution toward present day. Take the 1989 Honda Civic Si for example, which is newly featured. The name is still on the market, and the current model boasts 205 horsepower and 174 pound-feet of torque from its 2.4-liter four-cylinder. However, the current Si is being left behind in power by other performance compacts like the latest Volkswagen GTI, Subaru WRX and Ford Focus ST. Back in 1989, the Civic Si was still something of an upstart in the hot hatch ranks and definitely had something to prove. Remember, this was a about decade before the tuner boom of the late '90s gave these Hondas massive popularity. Though, the writing was on the wall for eventual success, based on the MotorWeek review. The show called it "stylish" and was attracted to vehicle's sharp handing, even with no power steering. Like today, power was lacking compared to major competitors like he VW GTI, but Honda's 1.6-liter four-cylinder with 108 hp and 100 lb-ft still received some praise. As always, it's fascinating to see how these now beloved models stack up when looking back. The high-performance Civic might be due for another surge in popularity too, if the forthcoming Type R from Europe ever makes to the US. News Source: MotorWeek via YouTube Honda Hatchback Performance Classics Videos honda civic si

Happy 40th birthday, Honda Accord!

The Honda Accord exemplifies the idea that if you make something great, people will flock to it. This is a car that has always offered something for everyone – quality, fuel economy, value, comfort. But why we really love the Accord is because, as former Car and Driver Editor in Chief Csaba Csere says in the video above, "it always drove a little bit better than the competition." Today the Accord turns 40 years old. Over the past four decades Honda sold more than 12.7 million of them, making its iconic sedan the best-selling car in America during that time frame. Honda likes to point out that the Accord is still young at heart, as it's the most popular sedan with the under-35 crowd. View 29 Photos Like most people, the Accord has grown larger and heavier through the years. But the appeal remains strong. The current Accord is one of our favorite family sedans, and a target that the competition rarely hits. It's the car that's synonymous with Honda in America, and in fact the first car built here when the Japanese company started production in Ohio in 1982. Honda has taken a look back at the car with the video above, which chronicles the Accord's history. The video below is a nice (if cheesy) comparison of the original 1976 model and the 2016 Accord Hybrid. And below that there's a neat infographic that compares those two cars as well as what was going on in the world in 1976 versus now. So happy birthday, Accord. We hope we're still going as strong as you when we get to your age.