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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 Civic Tourer caught testing ahead of 2014 launch

Honda showed off its Civic Tourer concept at the Geneva Motor Show in March, and at that time, we were told that a production version would be coming to market in the very near future. Obviously, the sleek lines of the concept car will be dumbed down slightly for consumers, but that doesn't mean the Civic wagon will be a bland machine. The Euro-spec Civic's angular front end looks like it will blend nicely with the rakish rump that we saw on the concept.
Our sources suggest that not only will the Civic Tourer be a class-leader in terms of cargo capacity, but it will likely be a pretty engaging car from behind the wheel, as well. Honda is hoping that the Tourer will account for roughly 20 percent of all European Civic sales after it goes on sale.
Expect to see the production car debut at the Frankfurt Motor Show this September, with the first customers taking delivery in early 2014. In the meantime, have a look at the camouflaged swoopy wagon from all angles in our gallery above.

2020 Subaru Outback and Cadillac XT6 drives | Autoblog Podcast #590

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Green Editor John Snyder and Associate Editor Joel Stocksdale. This episode is all about driving, on- and off-road, and in a variety of vehicles. In particular, the trio are talking about recent experiences in the 2020 Subaru Outback, 2020 Cadillac XT6, 2019 Mercedes-AMG C 63 S and 2020 Hyundai Palisade. At the end, they tackle an interesting and particularly tough "Spend My Money" question involving whether or not to put off purchasing a Jeep Wrangler in favor of a sensible daily driver. Autoblog Podcast #590 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 Driving the 2020 Subaru Outback Driving the 2020 Cadillac XT6 Driving the 2019 Mercedes-AMG C 63 S Sedan Driving the 2020 Hyundai Palisade Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: