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Mazdas Upcoming Skyactiv X Compression Ignition Engine Promises Diesel Like Fuel Economy. Mazdas powertrain team has brewed up a fancy new engine that, like a diesel, uses compression to activate the combustion process. In a press release on the new tech, Mazda tells us just how staggering the benefits of this worlds first technology might be. Set to debut in 2. Skyactiv X is Mazdas next generation engine that uses Spark Controlled Compression Ignition. In other words, its a homogenous charge compression ignition engine sometimes, but it seamlessly changes over to a regular spark ignition engine under certain engine operating conditions. Mazda may be well on its way to introducing a new Mazda. Read more Read. Mazda says the new tech combines the advantages of gasoline and diesel engines to achieve outstanding environmental performance, power and acceleration performance. And if those words arent good enough for you, Mazdas thrown out a few numbers. Together with a supercharger, the compression ignition engine can allegedly yield 1. Skyactiv G engines. Granted, the existing Skyactiv G motors are naturally aspirated, so youd expect more torque, here. What you wouldnt expect, though, is 2. Skyactiv G, a benefit that Mazda says is a product of the new engines super lean burn. Compared with Mazdas 2. Perhaps even more impressive is the fact that the purveyors of Zoom Zoom claim the new engines fuel efficiency equals or exceeds that of the latest Skyactiv D turbodiesel engine. Mmm, Diesel like fuel economy. Yes, please. The whole concept of homogenous charge compression ignition has been around for a while, but its implementation in commercial applications has been thwarted by the difficulty of controlling exactly when combustion occurs. With gas engines, spark plugs activate combustion, and with diesels, fuel injection is what sets the controlled explosion off at the right time. With an HCCI engine, theres no single lever to adjust in order to control autoignition. And everything from ambient air temperature and pressure, fuel quality, air fuel ratio, turbocharger boost, engine speed, engine load, and valve timing can affect exactly when this combustion occurs. This means Mazdas new engine will have to carefully dial in some of those parameters to adjust for the variables it cannot control. And sometimes, it will have to forgo compression ignition entirely, and just use a spark plug. Reuterssays part of the reason for the spark plug deals with low temperature combustion concerns, but in our earlier post on this topic, reader jariten. Mazda would go with a spark assisted system, saying My guess is that Mazdas engine is really a spark assisted HCCI engine that uses a regularish port or direct injection spark mode during transients, high load, or other non ideal conditions and only goes into HCCI during relatively steady state low load conditions cruising or idling when environmental conditions are within plannedmeasured parameters. Sea-Pro/BaitSentry.jpg' alt='Trophy X Ray Manuals' title='Trophy X Ray Manuals' />In its release, Mazda does say the new tech offers high efficiency across a wide range of rpms and engine loads, and it would only make sense if that wide range covered normal, low load driving conditions that most of us see day to day. Reader jariten. 17. HCCIs NOx emissions benefits, saying If theyve cracked the nut on HCCI it means lower NOx. The whole idea is that you have an airfuel mixture at just the right conditions that when the piston nears TDC you get simultaneous ignition everywhere. NOx contributor. While Im not an expert on homogenous charge compression engines, all of of this seems to makes sense. The more I read up on this tech, the more I get excited about its implementation in an actual production vehicle. Mazda will tell us more about their new engine tech before the Frankfurt Motor Show later this month, and Ill be there with a pen and a TI 8. Trophy X Ray Manuals' title='Trophy X Ray Manuals' />View and Download Kodak 2200 user manual online. Download Bioprocess And Fermentation Technology Pdf here. Medical Equipment pdf manual download. Discussion of boats, general boating questions and anything else directly related to an engine.