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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

2016 Honda Accord Coupe V6 Quick Spin

Popular opinion is that Honda has not been a friend to enthusiasts in recent years. The company killed the awesome S2000, got away from building low-cost driver's cars like the CRX, ruined the Civic Si (on multiple occasions, most notably in 2002 and again in 2012), and kind of neutered Acura into a listless near-premium brand devoid of its original charm. But there are bright spots: We're finally going to get a Civic Type R in the US, and while the new NSX is a long way from the lightweight original, it's still an extremely impressive specimen. And then there's the Accord Coupe, which doesn't necessarily look like a typical performance Honda on first glance. Honda has been building the two-door Accord for decades, even as virtually every other mainstream brand has abandoned the segment. What's even more interesting, is that Honda makes one for the car guys. The company builds a V6-powered, two-door coupe with a six-speed manual transmission that probably accounts for maybe half a percent of the Accord's overall volume. Such a blatant disregard for things like economies of scale could only be achieved by a brand with a real passion for performance. Now that the Accord has been fully refreshed for 2016, we set out to revisit our V6/manual hero. Driving Notes This naturally aspirated V6 produces 278 horsepower and 251 pound-feet of torque, which admittedly isn't as much as you'd get from the slightly larger V6 engines you'd find in the likes of the Dodge Challenger, Chevrolet Camaro, or Ford Mustang. But the Honda is extremely willing to rev. That, combined with a startlingly smooth, linear torque curve, means the 3.5-liter Earth Dreams V6 is remarkably composed in both normal and aggressive driving. Low-end grunt is easy to access, despite the 6,200-rpm torque peak, while the throttle response is relatively sharp for what you might expect in an Accord. It sounds spectacular too, with a howly, Civic Si-worthy exhaust note and a notable lack of any piped-in induction silliness. It simply sounds like, you know, an engine – and a very good one at that. The buttery smooth, six-speed manual transmission has a light action, making this a true case where all you need to shift is a flick of the wrist. The clutch pedal is light and the catch point is almost too broad, meaning it's easy to ride the clutch until you get used to this setup. Once you adjust, heel-and-toeing this front-drive coupe actually becomes an entertaining activity.

Editors' Choice: Top Five 2015 Frankfurt Motor Show Debuts

Consider the 2015-16 auto show season officially kicked off. The Frankfurt Motor Show offered a great look at the newest crop of production cars and conceptual machines, and brought some old favorites back into the spotlight for a closer look. (The Alfa Romeo Giulia, for example, debuted in June, but this was the first time most of us saw it.) Now that the dust has settled and we're all on flights back to the US, our editors cast their votes for their personal favorites from the Frankfurt show. These are the cars we truly loved seeing the most. But unlike other shows, there was no one runaway winner – all of the Top Five received positive praise from our team. We won't spoil the results, though. Scroll down to see what we liked most from this year's Frankfurt expo. 5th Place – MERCEDES-BENZ IAA CONCEPT View 12 Photos MIKE AUSTIN: The clean lines on this concept have me excited for a more elegant beauty to future Mercedes-Benz vehicles. Next to the Concept IAA, the lovely S-Class Coupe looks like an overstyled barge. DAVID GLUCKMAN: Yeah, the extendable rear is neat and all, but I'm more interested in the front-end styling of this one. It looks like the Tron version of a 300SL, in a good way. I'm hopeful it portends the future of Mercedes design. STEVEN EWING: I was super impressed when Mercedes said that, with the rear end extended, this concept has a drag coefficient of just 0.19. That's crazy aerodynamic. I'm not head-over-heels about the styling, but I think the lessons learned from this concept are really important, and will play a huge role in the future of Mercedes' products. 4th Place – ALFA ROMEO GIULIA View 15 Photos SEYTH MIERSMA: I can hardly express how in love with this car I am. The styling feels creative, modern, and evocative, without going over the top. The proposed performance is spectacular. And the Alfa badge speaks to a legacy of romantic motoring. DAVID GLUCKMAN: Pretty Italian car makes big promises and will probably deliver on about three quarters of them. I think that will still be enough for me. JEREMY KORZENIEWSKI: I'm really intrigued by the Giulia. It looks great, sounds awesome, and I'm expecting it to have a load more character than its German rivals. I hope I'm not disappointed. 3rd Place – JAGUAR F-PACE View 15 Photos GREG MIGLIORE: It's the first SUV for Jaguar, and I think they nailed the design, capability, and electronics. It's the right car at the right time.