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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 CB350 and cafe racer culture explored by Electric Federal

The latest video from Electric Federal covers one of our favorite aspects of motorcycle culture - café racers. In an interview with Adam "Gasser" Gaspic, the owner of Gasser Customs, EF takes a look at the culture and one of Gasser's latest offerings, a hopped-up Honda CB350, called the Silver Bullet.
Gasser has gone all-out on the Silver Bullet, replacing some of the body parts with fiberglass and delivering more than a few upgrades to the rebuilt engine. The brakes and suspension of the smaller bike also get some attention, as do some of the bike's aesthetics. Besides the upgrades, there's just something to be said for the sleek, minimalist nature of the little Honda.
Naturally, the videography is gorgeous, and it's a great look at a kind of motorcycling that seems to be overlooked in the world of sport bikes and Harley-Davidson-style cruisers. Take a look below for the full video.

SAE World Congress: Testing out the Honda UNI-CUB, Walking Assist Device

Based on the downstairs display at the 2015 SAE World Congress in Detroit this week, you would think that Honda is barely an automaker. Instead, it was a company that focuses on robots, bizarre unicycles, motorcycles, and jets. We were not adverse to the car-related tech on display upstairs, but we wanted a closer look at the UNI-CUB and the Walking Assist Device. The UNI-CUB is one of the strangest vehicles we've ever experienced. It feels telepathic, because when you're sitting on it and think you want to go forward, your body naturally leans and then the UNI-CUB starts to move. The UNI part of the name stands for unicycle, but that's kind of a misnomer, since this thing has more than one wheel. First off, there's a tiny wheel for balance at the rear, but the main wheel itself is made up of multiple smaller wheels, which Honda calls the Omni Traction Drive System. This is what lets the UNI-CUB move side to side instead of just frontwards and backwards. The Walking Assist Device is a small setup with motors, leg straps, and a battery pack. The idea is to have the machine help lift up your legs as you walk, with the target audience being people who have had an injury, like a stroke. The WAD sits outside your clothes and can help someone walk for about an hour from a 22.2V-1Ah lithium-ion battery. You can see more in the video above.