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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 recalling small number of Accord, CR-V models

This latest recall may not be a very big one, but it does strike us as an important one. Issued by Honda, the recall affects the 2014-15 Accord (specifically those equipped with the four-cylinder engine) and the 2015 CR-V, but only 137 of them. Those 137 vehicles, however, will need to have their short blocks replaced. What is a short block, you ask? Nope, it's not a chopped-down version of a big block: it's the engine block itself plus all its internal components, but short of any appendages that make it run. (That'd be a long block.) The problem, according to the manufacturer's statement below, stems from bolts – specifically the connecting rod bolt – that may have been improperly torqued during assembly. There's a system that's supposed to check that, but Honda reports that it "may not have identified improperly torqued bolts in a specific group of engines." Hence the recall. Owners of those few vehicles affected can expect to hear from the manufacturer to arrange bringing their vehicle into their local dealership to have the engine replaced, free of charge. Statement by American Honda Regarding Connecting Rod Bolt Recall: 2014-2015 Honda Accord 4-cylinder; 2015 Honda CR-V Mar 9, 2015 - TORRANCE, Calif. - 137 model-year 2014-15 Accord 4-cylinder and 2015 CR-V vehicles affected in the U.S. - Engine short block will be replaced in affected vehicles, free of charge - No related crashes or injuries have been reported Honda will voluntarily recall 137 model-year 2014-2015 Accord 4-cylinder and 2015 CR-V vehicles in the United States to replace the engine short block, free of charge. During engine assembly, an automated system that verifies engine connecting rod bolt torque may not have identified improperly torqued bolts in a specific group of engines. An improperly torqued connecting rod bolt could come loose, leading to potential engine damage and stalling, which could contribute to a crash. No crashes or injuries have been reported related to this issue, which was discovered through a warranty claim review process. Honda is announcing this recall to encourage all owners of affected vehicles to take them to an authorized dealer as soon as they receive notification of this recall from Honda. Mailed notification to customers will begin in late-March. In addition, owners of these vehicles can determine if their vehicles require repair by going to www.recalls.honda.com or by calling (800) 999-1009, and selecting option 4.

Honda Civic Coupe to join 2016 Red Bull Global Rallycross season

Red Bull Global Rallycross is about to get another competitor. Honda has announced that it will campaign the 2016 GRC season with its new Civic Coupe, and rather than just put out a press release, it's gone ahead and given us a look at the two-door's racing livery. Ford, Chevrolet, Volkswagen, and Subaru – be prepared. Based loosely on the production Civic Coupe, Olsbergs MSE and Honda Performance Division put in the wrench time to turn the ho-hum standard road car into a 600-horsepower, all-wheel-drive monster that can hit 60 in a hypercar-humiliating 1.9 seconds. And like all GRC cars, it will have no trouble managing some serious jumps. Piloting this hilariously potent coupe will be Sebastian Eriksson and 2014 series champion Joni Wiman. Wiman is Finnish, so his GRX championship should come as no shock. We have to say, compared to the GRX cars found in Europe, this Civic looks remarkably tame. We'd have no issue visualizing the body tweaks on this racer on a production Civic Type R. Then again, we're comparing it with the last big-time GRX entry we heard about – Ken Block's Ford Focus RS, which is running in FIA rallycross. According to Honda, OMSE and HPD will have the Civic Coupe GRX car ready for the season opener on May 21 and 22 at Phoenix's Wild Horse Pace Motorsports Park. View 4 Photos Related Video: Honda Debuts 2016 Civic Coupe Racing Livery to Compete in 2016 Red Bull Global Rallycross Series Will campaign the all-new Civic Coupe in partnership with Red Bull and Olsbergs MSE Mar 22, 2016 - NEW YORK Today Honda unveiled the new racing livery for its Civic Red Bull Global Rallycross racecar, announcing plans to campaign the all-new turbocharged 2016 Civic Coupe in the 2016 series in partnership with Red Bull and championship-winning race team Olsbergs MSE. The Honda Civic Red Bull GRC team will begin racing on May 21 in Phoenix at the first event of the season. Developed from a production-model 2016 Civic Coupe chassis by renowned builders and racers Olsbergs MSE (OMSE) with technical assistance from Honda Performance Development (HPD), the all-new Civic Red Bull GRC car is built to withstand the rigorous demands of racing in a series that emphasizes repeated aggressive acceleration and varied terrain. The car will boast more than 600 horsepower, turn in a 0-60 mph time of 1.9 seconds and is designed to handle the 70 foot table-top jumps featured on each racetrack.