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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 could halve its US lineup without crimping its sales much [w/video]

Taking a detailed look at the Honda lineup in the US, it isn't hard to see the strength of some models and the weaknesses of others. A recent report on Autoline Daily points out that its five core models - the Accord, Civic, CR-V, Odyssey and Pilot - make up a full 93 percent of Honda's sales in the US. Through April, Honda has sold 419,798 vehicles, and 389,474 of them were from these core models; not to mention the fact that the Accord was the top-selling car in the US last month.
This means that Honda could technically cut six of its 11 models and only lose about 5,000 sales per month. Of course, this is just some data crunching and there is no reason to believe that Honda is planning to kill off any of its models in the near future. In fact, it seems to be committed to the Ridgeline, while Japanese-made models that may actually lose money for Honda still fill unique voids. Scroll down for the video report - fast-forward to the 1:43 mark for the Honda info.

Driving the BMW M2 Competition, Honda Odyssey and Toyota RAV4 Prime | Autoblog Podcast #651

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by West Coast Editor James Riswick. This week, they talk about driving the BMW M2 Competition, Honda Odyssey and Toyota RAV4 Prime. Then they discuss James' experience testing the new Yakima CBX cargo carrier, Autoblog readers' preference for the GMC Hummer EV over the Tesla Cybertruck, and Mercedes-Benz taking a larger stake in Aston Martin. Lastly, they help James' father find a new car in the Spend My Money segment. Autoblog Podcast #651 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving 2020 BMW M2 Competition 2021 Honda Odyssey 2021 Toyota RAV4 Prime Testing the Yakima CBX Cargo Carrier on the Subaru Outback 75% of Autoblog Twitter follower prefer the GMC Hummer EV over the Tesla Cybertruck Mercedes-Benz to boost stake in Aston Martin to 20%, lend it some tech Spend JamesÂ’ fatherÂ’s money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: