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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 could halve its US lineup without crimping its sales much [w/video]

Taking a detailed look at the Honda lineup in the US, it isn't hard to see the strength of some models and the weaknesses of others. A recent report on Autoline Daily points out that its five core models - the Accord, Civic, CR-V, Odyssey and Pilot - make up a full 93 percent of Honda's sales in the US. Through April, Honda has sold 419,798 vehicles, and 389,474 of them were from these core models; not to mention the fact that the Accord was the top-selling car in the US last month.
This means that Honda could technically cut six of its 11 models and only lose about 5,000 sales per month. Of course, this is just some data crunching and there is no reason to believe that Honda is planning to kill off any of its models in the near future. In fact, it seems to be committed to the Ridgeline, while Japanese-made models that may actually lose money for Honda still fill unique voids. Scroll down for the video report - fast-forward to the 1:43 mark for the Honda info.

Takata airbags were adopted in late 1990s to save a few dollars per vehicle

According to a new report from The New York Times, General Motors started using airbags supplied by Takata in the late 1990s as a cost-saving measure even after receiving warnings about their safety. Takata's airbag modules were reportedly 30-percent cheaper than its competitors' offerings. GM approached Autoliv, which until that time had been its main airbag supplier, to see if it could offer a competitively priced alternative to Takata. Autoliv tested Takata's airbag inflator and found that it was unsafe, according to scientists who worked for the supplier at the time. Chris Hock, who until recently still worked for Autoliv, said the inflator "turned it into shrapnel" when tested. GM was subsequently warned by Autoliv that Takata's ammonium nitrate inflators were potentially dangerous. Still, "General Motors told us they were going to buy Takata's inflaters unless we could make a cheaper one," said Linda Rink, who served as a senior scientist at Autoliv at the time. A spokesperson for General Motors told The Times that it would be inappropriate to comment on discussions that "occurred two decades ago between Old GM and a supplier." So far, no Takata-supplied airbags have ruptured in an accident, and GM was far from the only automaker to make a switch to Takata airbags in order to save money. A total of 64 million airbags have so far been recalled from nearly every automaker selling vehicles in America. A spokesperson from Honda said in a statement to The Times that "There was no industry understanding in the late 1990s" that ammonium nitrate airbag inflators were risky. The majority of deaths linked to Takata airbags were in vehicles built by Honda. Takata still produces airbag inflators that use an ammonium nitrate compound, despite the devices being blamed for at least 14 deaths. Click here for NHTSA's dedicated site on open Takata recalls. Related Video: News Source: The New York TimesImage Credit: Joe Skipper / Reuters Government/Legal Recalls GM Honda Safety autoliv