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Mazda patents show rotary engine for range-extended EV

Two years ago, Mazda introduced a fascinating range-extended electric car called the Mazda2 RE Range-Extender. It took an electric Mazda2, and dropped in an itty-bitty 330cc rotary engine. It wasn't the rotary-powered sports car we had hoped for, but it seemed like a unique way to keep the quirky engine alive and kicking. But not long after the car's reveal, it seemed to disappear. Now the basic idea has resurfaced with a few modern updates in a couple of US patents. The first patent is pretty straightforward and describes a range-extended EV similar to the BMW i3. At the front is an electric motor driving the front wheels. At the back is an internal combustion engine that powers an electric generator. In the middle is a lithium-ion battery for storing and delivering electricity. It's the same set-up as that Mazda2. The second patent is for an engine start-and-stop system, but specifically for rotary engines. The system is designed to shut off a rotary engine when not needed, much as modern piston engines do. It also stops the rotor in a position that closes the intake port to ensure no fuel or exhaust emissions slip out through the intake tract. This is necessary since there are no valves in a rotary, and air and exhaust come through ports that are "opened" and "closed" by the rotor itself. The patent also describes the possibility of firing a spark plug after the fuel has been cut to eliminate any leftover fuel emissions. This system would theoretically improve a rotary engine's fuel economy and emissions significantly, which would be a boon as those are two of the rotary's major weaknesses. The rotary-engine patent also includes the same range-extended powertrain drawing as the first patent. It's there as a description of a possible application. And in such an application, where the rotary wouldn't have to run all the time, the system could take advantage of the rotary's inherent strengths. Weight can be kept low thanks to the engine's small dimensions, which should help in keeping the car sprightly and efficient. Rotaries are renowned for smoothness, too, so it shouldn't need too much refining and sound deadening, the latter of which adds more weight. The small size would also help with packaging, leaving more space for people, cargo, or possibly batteries. And since it has been patented, the company may be looking to bring the system to market.

Mazda6 diesel is coming, too, Mazda promises (again)

As we noted our piece earlier today about the CX-5 diesel, we've been waiting for Mazda to bring its Skyactiv-D engines to market for years. Tripped up by an emissions certification nightmare that caused delays and resulted in lackluster power and fuel economy numbers, they're late to the party. In the CX-5 diesel, it's also a questionable proposition at almost $4,000 more than the much more powerful CX-5 Turbo. But today, Mazda's U.S. president confirmed to Autoblog that the diesel engine would make its way into the 6. Like the CX-5, it'll only be offered with all-wheel drive and only on the top Signature trim level. Unlike the CX-5 diesel, which goes on sale in July, we don't know when the Skyactiv-D-powered 6 will go on sale. But it seems like later this year is a good bet. How much longer can Mazda wait, really, once the CX-5 diesel is on sale? The diesel Mazda6 will use the same 2.2-liter engine as the CX-5. It'll probably offer the same power figures – 168 horsepower at 4,000 rpm and 290 pound-feet of torque from a low 2,000 rpm, with a 5,500-rpm redline. The fuel economy bonus for choosing a diesel over the turbocharged gas engine should roughly parallel the difference in the CX-5: about 5 mpg in the city and 3 mph on the highway. That said, we don't know the 6's EPA fuel economy numbers yet. We expect the price premium to roughly parallel the CX-5 as well, so the diesel will likely be several thousand dollars more than the gas turbo engine in the same Signature trim. These are educated guesses, of course, and when we have firmer numbers or solid estimates from Mazda we'll let you know.

Should you buy a leftover 2015 or a brand new 2016 model?

One of the most common questions I get asked as a car dealer and auto auctioneer is, "When is the best time to buy a new car?" The answer is usually the time period between Labor Day and the middle of November. That's because this is when new car dealers and the manufacturers are trying to get rid of their current-model-year vehicles to make way for a small army of 2016 models. Rebates, incentives, cheap financing, and overstocks of unpopular models all help create the liquidity needed to turn the old inventory into a new set of wheels for the buying public – often at a very reduced price. But sometimes the "old" new car isn't a better pick than the "new" new car. It depends on a lot of factors, including the car in question and the differences from one model year to the next. I recently received an email from Jeff, who is interested in the Mazda CX-9 and asks whether he should buy a 2015 model or wait for the new version that will debut soon in LA. I'll use his as the example case. Length of Ownership The longer you own a vehicle, the less model year depreciation will be an issue. For example, the difference in value between a five-year-old Mazda 6 and a six-year-old version is about $1,500 according to the Manheim Market Report ($5,600 vs. $4,100). But if you look at the difference between 10-year-old and 9-year-old versions of that same vehicle, the price difference shrinks all the way down to $200. Because Jeff plans to own his new crossover for many years, the 2015 model wins in this category. View 19 Photos Rebates and Incentives The current CX-9 has a $4,000 cash incentive from Mazda. This is in part because Mazda still has quite a few left over. That $4,000 rebate for the current model is already coupled with even stronger discounts at the dealer level for those leftover 2015 models. TrueCar is showing that a loaded 2015 model can be had for $7,000 off the sticker at $28,600. You may even be able to beat that price by negotiating the deal yourself. Another thing to consider is that new models tend to be in high demand when they launch, which means that your purchase price will likely be substantially higher with the new model than it will with a leftover 2015. Again, financially speaking, this is a vote for the 2015 model. New Stuff It's also important to weigh what new features will come along with the updated model and how important they are to you.