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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

2012 Honda NC700X

Honda Builds The Crossover Of Bikes
Here in the land of Harleys and highways that stretch to infinity, Americans don't care much for sensible motorcycles. Unlike the majority of global bike buyers, North Americans tend to choose escape over utility, performance over practicality - that's simply how it's been done in the land of the free, at least until a funny thing happened on the way to the global recession.
As bank balances thinned and fuel prices crept skyward, sales of puffed up sportbikes and cartoonishly endowed cruisers plummeted. Americans rediscovered that motorcycles could be used for tasks like workaday commutes and trips to the grocery store, not just for riding into a Marlboro Man-approved sunset, fringe in tow. As consumers matured, manufacturers slowly responded with bikes better suited for purposeful priorities.

Senna's McLaren drives Honda up the wall

Honda is getting excited for its imminent return to Formula One with McLaren. So excited, in fact, that it got its new/old friends from Woking to loan it one of its old F1 cars. But not just any old F1 car...
On display at the Honda stand in Frankfurt this year is the 1988 McLaren MP4-4 in which the legendary Ayrton Senna drove to fifteen out of sixteen grands prix that season to take the championship in spectacular style.
Honda provided the engine for that car, a 1.5-liter turbo V6 with upwards of 600 horsepower to propel less than 1,200 lbs. Of course this being a static display car, it's likely been stripped of its engine, gearbox and most other internal mechanical components. But that doesn't make the sight of it any less memorable.