2006 Honda Pilot Lx All-wheel-drive, 244hp V6, 3 Seat Rows, Very Clean 1 Owner on 2040-cars

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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

Watch the latest Civic Type R hit the track in Japan

The latest Honda Civic Type R is very sweet forbidden fruit because the launch of the new generation Civic in the US suggests that the 306-horsepower turbocharged hot hatch might not arrive on this continent in its current form. However, the next one should come here and could have an even more powerful version of the Ohio-made 2.0-liter engine. While North American buyers wait, Best Motoring host Keiichi Tsuchiya slips behind the Type R's wheel in this video to show us what we're missing. After the Drift King's drive, the CTR looks a little rotten. Tsuchiya seems to fight understeer from the moment he hits the first corner of the very tight Nikko Circuit, and it doesn't appear to let up over his couple of laps. Unfortunately, this clip doesn't have English subtitles, so we can only draw conclusions from Tsuchiya's driving – unless you understand Japanese. There could be a few explanations for the Civic Type R's performance in this video. There's still snow on the ground, so the performance tires could have trouble with grip in the cold. The track's layout also doesn't provide much opportunity to open the throttle. The tight corners really tax a vehicle's handling, and the hot hatch's front-wheel drive lap record at the Nurburgring suggests the Type R might prefer a quicker track. We also remarked on understeer during our First Drive, but it wasn't this bad. If you're unfamiliar with Best Motoring and Tsuchiya, you're missing out. The show puts racing drivers into mostly Japanese performance cars and lets them offer their driving impressions. Tsuchiya is the star and quite an accomplished racer, one of the drivers who took a class win in a Honda NSX in the 1995 24 Hours of Le Mans. If you've missed out on these clips, prepare to waste a weekend watching the series on its YouTube channel. Related Video:

Honda recalls 304k Accords for sudden side-airbag deployment

Honda is recalling 303,904 US examples of the 2008-2009 Accord because the side airbags or curtains can inadvertently deploy. The automaker said the problem is not related to Takata's airbag problem or any other supplier. Instead, the issue concerns the software's deployment threshold for side impacts. These sudden deployments can happen if the ignition is on, and the door is forcefully closed. They might also occur if there's a strong enough impact to the underside of the vehicle, like from road debris. As of October 12, 2015, Honda has 19 allegations of injuries from this problem; plus 311 warranty claims and 160 field reports, according to a chronology submitted to the National Highway Traffic Safety Administration (as a Word document). The fix will be a software update to adjust the Supplemental Restraint System, and Honda will begin mailing notifications to owners in mid-December. Statement by American Honda Regarding Side Airbag Inadvertent Deployment Recall: 2008-2009 Honda Accord Sedan Oct 29, 2015 - TORRANCE, Calif. Side and/or side curtain airbags may inadvertently deploy if the ignition is on and a door is forcefully slammed or there is a significant impact to the vehicle underbody. Issue arises from side impact deployment threshold specification; Not a hardware or supplier issue. Free software update will adjust the deployment threshold. Honda will voluntarily recall 303,904 model-year 2008-2009 Accord vehicles in the United States to update the side Supplemental Restraint System (SRS) software, free of charge. The SRS threshold setting for the side impact sensor is such that with the vehicle ignition on, if there is a strong, non-vehicular collision impact to the lower body of the vehicle or if a door is shut with extreme force, the SRS control unit may interpret the input as a crash and command the side seat airbag and/or side curtain airbag to deploy. Airbags that unexpectedly deploy may increase the risk of injury. Honda has received 19 injury claims related to this issue. Honda is announcing this recall to encourage each owner of an affected vehicle to take it to an authorized dealer as soon as they receive notification of this recall from Honda. Mailed notification to customers will begin in mid-December 2015. Additionally, owners of these vehicles can now determine if their vehicles will require repair by going to www.recalls.honda.com or by calling (888) 234-2138.