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2015 SEMA Show Recap | Autoblog Minute

We take a trip to Las Vegas for a preview of the 2015 SEMA Show, the trade show for automotive aftermarket professionals and enthusiasts. Autoblog's Eddie Sabatini reports on this edition of Autoblog Minute, with commentary from Senior editor, Greg Migliore. Chevrolet Ford Honda Mazda Autoblog Minute Videos Original Video galpin

Mazda Skyactiv-X Review | The revolution begins with a squeeze-bang

The matte black Skyactiv-X prototype looks like a rough Mazda3, perhaps reconstructed after a bad wreck by an over-enthusiastic owner of a spot welder and lots of gaffers' tape. Ribbed ducts poke out of the dash sending two breaths of conditioned air to no one in particular. Even its revolutionary engine, the thing we're here to experience, is entombed in a massive, nondescript cover to mask its unseemly noises. It's a wild, strange way to meet a very unconventional vehicle that promises diesel-like fuel economy, a wide torque band, and an exotic method for burning less gas than ever before. It takes a few hours for Mazda's engineers to explain the fundamental principles of operation. For more detail, read our Skyactiv-X Spark Controlled Compression Ignition explainer, but here's a very brief overview. Skyactiv-X marries some traditional gasoline engine characteristics with a novel form of compression ignition called SPCCI. The key for Skyactiv-X is to use very high compression in the cylinder and an extremely lean fuel-air mixture. Squeezed right to the cusp of getting hot enough to blow up all on its own (which is very hard to predict), a squirt of extra gas and a spark interject to cross that compression-ignition threshold in a controlled and predictable manner. See the animation below: That takes a few essential components to get just right. One is a massive amount of computer processing power and some pressure sensors in the individual cylinders, because the ambient conditions change how and when these things happen. Skyactiv-X uses a clutched supercharger to pump in additional air when needed to nail the mixture precisely, and high-pressure injectors to get the low ratios of fuel to disperse properly in the chamber. And since it operates like a conventional gasoline engine sometimes, it uses valve timing to lower the very high compression ratio so it doesn't reach combustion ignition in that mode. In practice, the Skyactiv-X runs in compression ignition mode most of the time. In practical terms, that means it drives like a torquey gasoline Skyactiv engine. The torque curve is broad and flat — diesel-like in that respect. That also means it can get away with using a six-speed transmission and a lower final drive for better response. There's enough grunt and economy together that Mazda can let the engine spin faster — at 60 mph, it's running at roughly 1,000 more RPM than a similar gas engine, with greater efficiency.

Junkyard Gem: 2004 Mazda RX-8

You know when a type of vehicle has reached its value tipping point (where it's not worth fixing up a broken or crashed one) when examples of it begin showing up in the big American self-service wrecking yards. During 2016, the BMW Z3 and Mazda RX-8 reached that point and began to appear, just one at a time, here and there, but obviously they were the advance scouts for many to follow. Such cars usually get picked over in a hurry ... at first. Here's a well-stripped example of a first-year RX-8 I found earlier this year in a Denver yard. Some RX-7 owner probably nabbed the Renesis engine right away, and then the guys who grab late-model parts to flog on eBay were next. Still, plenty of interesting components remained on this car when I photographed it, and RX-8s that end up here in a year or two won't get swarmed by the vultures anywhere near as quickly. Does that mean that RX-8s are now cheap enough to race in the 24 Hours of LeMons? Could be! Related Video: Featured Gallery Junked 2004 Mazda RX-8 View 11 Photos Auto News Design/Style Mazda mazda rx-8