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Mazda to Introduce Clean Diesel CX-7 with SCR at the Frankfurt Motor Show

Mazda CX-7 equipped with a MZR-CD 2.2-liter clean diesel engine (European specifications). Click to enlarge.

Mazda Motor Corporation will exhibit freshened CX-7 SUVs with European specifications at the 63rd Frankfurt Motor Show, which will be held from 15-27 September. Newly added to the updated CX-7 lineup—and to be exhibited at the Frankfurt Show—is a version powered by Mazda’s MZR-CD 2.2 liter diesel engine mated to a selective catalytic reduction (SCR) system. (Earlier post.)

SCR systems substantially reduce NOx emissions, which helps the diesel CX-7 to comply with Euro5 emissions regulations. The diesel CX-7 will be launched in Europe in October 2009, with Australian sales following in November.

Urea SCR system diagram. Click to enlarge.

Mazda’s MZR-CD 2.2L turbodiesel engine produces low volumes of engine-out NOx, which means that the SCR system needs to remove less NOx in post processing, resulting in a reduced amount of urea required for NOx reduction. Mazda’s SCR system sprays AdBlue aqueous urea directly into the exhaust flow in front of the catalytic converter, with conversion of approximately of 40% of NOx into nitrogen.

By reducing the size and weight of the system components, which include an AdBlue storage tank fitted under the luggage area, Mazda is the first Japanese automaker to successfully equip a passenger vehicle with an SCR system.

Even with the added components, the diesel powered CX-7 offers the same 455 liters of luggage space as gasoline engine models. Additionally, Mazda’s SCR system was designed to minimize consumption of AdBlue, enabling the diesel CX-7 to run for 20,000 kilometers (12,427 miles) between refills under normal driving conditions.


The Goracle


The Honda diesel engine (62 mpg highway Acura TS) has been banned in the U.S. Will congress ban this engine as well? We CAN'T have efficient engines in the U.S. Of course the engine is available in Europe and other progressive areas of the world.



Hey Goracle,

Congress didn't ban diesels. They banned dirty car exhaust. Now that European emission standards are catching up to the ones in the US, and fuel prices are sure to rise again, the cost of making diesel models comply with our various regulations has become worth their investment. Why would Honda, Nissan, Mazda and Toyota spend money to roll out models that would barely sell when they were able to make tons of money (until recently) selling big, expensive, thirsty machines?

The difference between the Japanese auto companies and our own now-not-so-big 3 is that they have been successfully selling cars like this in other markets, where they would have gotten creamed trying to pedal Sequoias (way too much irony in that name for me to handle) and Titans. Instead of having to design the small, efficient platforms from the ground up, they merely had to adapt them. If you haven't seen any announcements, it's because Japanese companies typically don't say much about new models until they're about ready to release them. Those cars are coming.

I'm still trying to figure out why Ford isn't working on making US versions of their EU diesel cars. I'd much rather buy a partly US-made Focus diesel than another Brazilian Golf with a Polish TDI (fun to drive, but the upkeep is horrendous), although I'd definitely consider the Honda before either of those two.

The other thing to consider is the difference in refining infrastructures between the US and EU. Most of their refineries utilize a cracking process which yields proportionately more of the middle distillates, i.e. kerosene, jet fuel, heating oil and diesel. Most of our refineries utilize other forms of catalytic cracking which are tuned to produce a greater proportion of gasoline. A sudden drop in oil consumption due to 62MPG diesel cars plus the sudden gasoline/diesel supply imbalance would make for an entertaining predicament for our beloved oil companies. Could they have been leaning on the big 3 about this?



Local/national standards are very often designed and adjusted to block imports and protect the local industries.

Import duties are also imposed (twisted) for the same reasons.

Environment has little to do with it.

The Goracle


Praise be to Algore.

Praise be to Algore.

Praise be to Algore.

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