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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 to spool up turbos, workforce with F1 tech

Honda has had a longer and more tumultuous relationship with Formula One than just about any other automaker. It had only been building cars for four years before it entered F1 in 1964 as the first Japanese team in the series, winning its first race the following season but shuttering the program a few years later. Honda came back to power the likes of Williams and McLaren to several World Championships in the '80s and '90s, but things took a downturn when it started a partnership and ultimately took over British American Racing. After pouring untold billions into the effort, the economy tanked, and Honda ultimately sold the team, which subsequently claimed the championship - under new ownership and Mercedes power. Now Honda is gearing up to return in 2015 with a new turbocharged V6 hybrid powertrain it's supplying initially to McLaren, which in turn is switching back to Honda from nearly two decades with Mercedes.
So why return to F1 now? That's precisely what Autoblog asked Honda's Global President and Chief Executive Takanobu Ito (pictured above with McLaren chief Martin Whitmarsh) while visiting his office in Tokyo. While he wouldn't reveal specifics (like when his company's new engine would be available to other teams, as it most certainly will in the long run), Ito-san was clearly happy to discuss the motivation behind the move and the value he feels it brings to the company and its products.
Ito pointed toward the proliferation of motors within Honda's powertrains as a development he hopes to take to road from track

Acura NSX prototype gets back on track

Developing a new vehicle is not without its complications, we're sure, but usually things follow a fairly predictable progression: you develop a prototype, you test it, test it and test it again, then you put it into production. What you don't expect is that your prototype will burn to the ground, but that's what famously happened to the NSX which Honda engineers were testing a few months ago.
Fortunately, the Acura NSX prototype is back on track, both literally and figuratively, as you can see from this latest batch of spy shots snapped at the Nürburgring. This camouflaged prototype looks pretty much the same as the last one, only, you know... less crispy. Which is to say, it looks pretty much ready to hit showrooms.
The naysayers may point out that Honda chose colder and damper weather to put the NSX back into testing - thereby mitigating the risk of another fire - but we're sure the Japanese automaker has been working hard to fix the flammability issues, whatever may have caused them, over the past few months. At least, we hope they have.