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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

Is the original Acura NSX a perfect supercar?

The long-awaited arrival of the second coming of the Acura NSX has naturally brought with it many deep retrospectives on the first Acura NSX. Xcar is the latest with a stint in the time capsule, lining up three NSXs to sample at a track in the UK. There's the red wonder that started it all, the standard aluminum-bodied car that went on sale in 1990, so simple and easy-to-drive, extracting more joy than many thought possible from a 3.0-liter V6 with 'just' 270 horsepower and 210 pound-feet of torque. The 25-year-old exotic shows its years, but mostly because of an automatic transmission that dampens throttle response and doesn't like changing gears. The praises it earned in the day, however, still remain, namely excellent steering, handling, and feedback. After that comes laps in the first NSX Type R, the model that lost more than 250 pounds by having no air conditioning, sound deadening, or stereo, and lightweight tweaks like carbon seats and thinner glass. Although it the tuning makes it much harder, the presenter wants to know, "Why isn't Honda making a car like this today?" Then there's the 2002 model, the one that would only last three years before closing the door on a fifteen-year run. It got better at the same time as it got softer, but by then the NSX had nothing left to prove; it hit every one of its targets, it realigned the segment in ways we're still benefiting from, and for at least half of its run nothing else could touch it. Based on the reviews so far, that might include the brand new, very good and very complicated NSX. Check out the video above for Xcar's take. Related Video: News Source: Xcar via YouTube Acura Honda Coupe Luxury Performance Videos xcar honda nsx

Honda reveals XR-V crossover in Chengdu

Global automakers have been moving largely towards global products, but that doesn't mean it can't tweak them for local tastes. Take Honda, for example, and its new compact crossover. Unveiled late last year as the Vezel, the crossover is expected to arrive in Europe and North America as the HR-V. But in China, it's being called the XR-V and adopts the form you see here.
Presented by Dongfeng Honda at the Chengdu Motor Show, the new XR-V is based closely on the Vezel but adopts some unique bodywork for a more rugged look. The front end gets a more SUV-like grille and bumper, while the side flanks are less swoopy but with more muscular wheel arches. The result may not be as bonkers as the Mugen version that debut at the Tokyo Auto Salon tuner show, but reminds us more of the similarly named and ruggedized Subaru XV Crosstrek.
Though technically billed as a concept, the Chinese-market XR-V looks just about ready for production as it is. Both 1.5- and 1.8-liter engines are specified, and while there may not be a wealth of other details available, you can read what there is in the press release (presented in original and translated forms) below.