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Mazda has officially launched its new 2.2L diesel MZR-CD diesel engine in the European market version of the 6. The all-new engine is coming in three different power levels, with 125, 163 and 185 hp. The common rail fuel system uses injectors with 10 spray holes rather than the 6 used in the existing 2.0L diesel. The increased number of holes provides better atomization of the fuel as it goes into the combustion chamber. The hole diameter has also been reduced from 0.13 mm to 0.119 mm and the pressure in the common rail has been increased from 26,000 to 29,000 psi. All of these combine to allow for more precise control of the fuel flow, for reduced consumption and noise. The lower 16.3:1 compression ratio also contributes to noise reduction as well as lowering the combustion temperature for reduced NOx production. Mazda has used an aluminum block with a balance shaft to reduce vibration. According to Mazda, the balance shaft actually reduces the overall weight of the engine. Without the balancer, the block would have had to have been made beefier to reduce the vibrations increasing the net weight. Downstream of the engine, Mazda is using its new particulate filter design that requires less frequent regeneration and lower fuel consumption. Unfortunately, there is no NOx reduction system and Mazda has not indicated any intention of bringing this engine to North America. Combined fuel economy ratings in the Euro-spec Mazda6 run 42-43 mpg (U.S.) on the EU test cycle. There are more details after the jump.


[Source: Mazda]

Mazda6 New 2.2-litre Diesel Engine

Mazda's New-Generation
Powerful and Clean Diesel

The second-generation Mazda6 was launched in November 2007 and represented an evolution of Mazda Zoom-Zoom. It set a new standard in the non-premium CD segment for its combination of eye-catching stylishness, exclusive driving experience and insightful packaging, all offered in three distinct body styles. Since launch, it has found over 85,000 owners in Europe and has been contributing to Mazda Motor Europe's record sales in 2008. Now the Mazda6 is about to get even more popular with the introduction of a new Mazda-developed 2.2-litre turbo diesel engine that is one of the quietest and most powerful in its segment and a new rear vehicle monitoring system for more active safety.

Mazda6 has always been a driver's car and with the launch of the new-generation model last year, the fun factor was improved even further. The second-generation Mazda6 was introduced originally with four different engines – three lively MZR petrol engines (in 2.5, 2.0 and 1.8-litre displacements) delivering power between 170 PS to 120 PS, and a MZR-CD 2.0-litre common-rail turbo diesel producing 140 PS and 330 Nm of torque. Mazda now introduces a new clean turbo diesel in three power derivatives that is one of the quietest and most powerful in its class.

Mazda's new MZR-CD 2.2-litre turbo diesel has a lively yet cultivated character that will offer a truly exclusive driving experience under the bonnet of the second-generation Mazda6. Offered in three versions producing 185, 163 and 125 PS of maximum output and powerful torque of 400, 360 and 310 Nm respectively, the MZR- CD 2.2 will meet the demands of a wide spectrum of customers in Europe.

Delivering the Power – Output and Torque
To realise this kind of power and torque with 2.2-litres of displacement, the MZR-CD 2.2 employs a highly efficient variable-geometry turbo charger (VGT) with curved (instead of straight) vanes on the turbine (exhaust) side. This increases maximum available torque at both low and high engine speeds, while also increasing all-important low- end response (as low as only 1,800 rpm with a lat maximum torque curve that continues until 3,000 rpm) that contributes smooth and powerful driving feel. When combined with an abradable seal on the compressor side (intake side), which reduces the clearance between the blade and the compressor housing, these deliver superior turbocharger response at just about all engine speeds.

Converting the engine's combustion energy into this much engine torque meant the pistons had to be designed to take the resulting high combustion pressure and temperatures. As a consequence, the pistons are made of an aluminium alloy with improved high- temperature fatigue strength. A half-Keystone cross-section top- ring with improved carbon scavenging abilities is used, and the groove for the top ring is made more durable with the adoption of a cooled ring carrier that increases the groove's cooling capability.

Mazda engineers also increased the fuel injection pressure to 200 MPa (by comparison, the previous generation MZR-CD 2.0- litre turbo diesel uses 180 MPa). They realised this by making functional improvements to the high-pressure pump, among other improvements, and by new injectors featuring 10 spray holes per injector (instead of the 6 spray holes for the MZR-CD 2.0-litre) that are smaller (reduced from 0.13 mm to just 0.119 mm). These changes enable more precise injection timing, and an increase in the number of times of injection and injection amount. And it allowed the fuel injection patterns at transitional states to be more precisely controlled. As a result, the Mazda6 MZR-CD 2.2 provides superior acceleration in those situations you need it most, like entering the motorway. It also surpasses its competitors in lower speed acceleration. Acceleration in 3rd gear from 50 to 100 km/h, for example, is 1.7 seconds faster than the MZR-CD 2.0-litre.

Low Fuel Consumption
This new diesel engine also meets the requirements of Mazda's 'Sustainable Zoom-Zoom' plan by being frugal at the pump: all power derivatives use between 5.5 and 5.7 litres of fuel per 100 km (combined), some of the segment's lowest.

New injector with 10 spray holes

It achieves this by employing highly responsive solenoids for the common-rail injection system that achieve a minimum injection interval of just 0.2 ms (the MZR-CD 2.0 is 0.3 ms), which speeds up the minimum injection interval by about 30 percent, improves its responsiveness and lowers fuel usage. Fuel is also saved by lowering the compression ratio to 16.3:1 and utilizing the temperature cooling effect this causes, which secures more mixing time until ignition, and allows a more precise fuel-injection pattern. As a result, fuel consumption is a low 5.5 to 5.7 litres (depending on derivative) with CO 2 emissions from between 147 to 152 g/km. In fact, the MZR- CD 2.2-litre offers substantially higher power and torque than the previous-generation MZR-CD 2.0-litre, while delivering equal levels of fuel consumption and CO 2 emissions.

Low Emissions – Particulate Filter with World's First Ceramic Support Matrix Structure
Mazda engineers not only made the new 2.2-litre turbo diesel powerful and low consumption, they also lowered the amount of raw emissions and raised the efficiency of its after-treatment technologies. The engine's highly responsive fuel-injection technologies have new injectors (see above) that yield better atomized spray characteristics. These are combined with an exhaust-gas recirculation (EGR) system with a cooler bypass structure – that decreases unburned gases and NOx – and the high- response solenoids described above, to realise superior emissions performance without sacrificing power.

Emissions are then treated by a diesel particulate filter that uses a unique Mazda-developed, ceramic support matrix structure, which is the first of its kind to go into production in the world. Previous diesel particulate filters converted particulate matter (PM) into CO 2 by reacting the PM with the oxygen in the exhaust gas at the surface of the catalytic particle. This meant that the time needed for filter regeneration was determined by the amount of oxygen on the surface of the catalyst.

When the temperature of the exhaust gas is raised to quicken the regeneration time, then technological issues – like higher fuel usage or the ceramics exceeding their thermal resistance limit – can occur. Mazda solved these issues by using highly thermal resistant material for the ceramic monolith of its new diesel particulate filter, and designing the internal structure of the ceramic support matrix with passages for oxygen to enable a large amount of oxygen to be utilized for PM combustion. With this, Mazda has succeeded in significantly increasing the PM combustion speed. As a result, the number of times the diesel particulate filter has to regenerate (in combined mode) is cut in half, and the time necessary for each regeneration phase is shortened by one third. For owners of the new Mazda6 MZR-CD 2.2-litre turbo diesel, this means worry-free filter regeneration and, because fewer regeneration phases are required and each takes less time, less fuel consumption overall.

Running Quiet
The new Mazda6 MZR-CD 2.2-litre common-rail not only offers superior output, fuel economy and emissions performance, it is also one of the quietest engines in its segment with this amount of torque. This ensures a driving experience that is one of the non- premium segment's most exclusive. To achieve this, the new engine has a lower block with a very rigid aluminium-alloy structure, with the bottom of the cylinder block skirt and the cylinder block's main bearing caps bolted to the lower block at 18 separate locations. This high structural rigidity is combined with a front chain-driven cassette-type balancer shaft to suppress booming noise and lower radiated noise, and to deliver optimised pedal response and engine sound for a reined acceleration feel.



Balancer shafts

Packaging and Weight Management
Keeping the new MZR-CD 2.2-litre engine as close as possible in size and weight to that of the MZR-CD 2.0-litre diesel was a key factor in ensuring exhilarating performance combined with fuel efficiency and low emissions. Some of the newly adopted technologies, such as the balancer shaft and DOHC, result in increased size and weight. Nonetheless, numerous innovations were added to manage size and weight increases, with the goal of maintaining packaging and keeping the weight increase within just 6.0 kg of the previous MZR- CD 2.0-litre turbo diesel.

Due to the increase in displacement, the stroke of the MZR-CD 2.2 was lengthened by 8 mm compared to the MZR-CD 2.0. At the same time, the overall length of the connecting rods was shortened by optimizing their design. As a result, their weight remains at the same level as in the MZR-CD 2.0. The adoption of a balancer shaft that decreases vibration caused by reciprocating motion made a thinner cylinder block with fewer ribs possible (if the MZR-CD 2.2 had no balancer shaft, the cylinder block would have been 1.9 kg heavier than that of MZR-CD 2.0, and its crankshaft 1.3 kg heavier.). Furthermore, decrease in size and weight was achieved by making the balancer housing, oil pump housing, and the oil suction pipe a single structure. To achieve even more weight reduction, while increasing the cooling capability of the new engine, the oil cooler is made of aluminium (-0.6 kg). The weight of the cam cover is also reduced by making it out of plastic (-1.0 kg).

Mazda6 MZR-CD 2.2-litre Turbo Diesel High Power - Engine & Chassis

MZR-CD 2.2
High Power
Engine Type In-line 4-Cylinder DOHC, 16-Valve
Turbo-charged diesel
Displacement cm3 2,184
Bore x stroke mm 86 x 94
Valves 4
Camshaft drive Chain
Fuel injection system Electrically controlled direct-injection
Common-rail
Compression ratio 16.3 : 1
Emission control system Electrically controlled with catalyst and diesel
particulate filter system
Max. power kW 136 at 3,500 rpm
PS 185 at 3,500 rpm
Max. torque Nm 400 at 1,800 to 3,000 rpm
Fuel type
Diesel Fuel tank capacity l 64
Engine oil capacity l 4.7 with oil filter
Battery 95D31L
Transmission 6-speed manual
Powertrain Front-wheel drive
Gear ratios
1st 3.538
2nd 1.913
3rd 1.290
4th 0.926
5th 0.853
6th 0.711
Reverse 3.831
Final Drive Ratio (1st – 4th)/
(5th, 6th, Rev.) 3.611/3.095

Mazda6 MZR-CD 2.2-litre Turbo Diesel High Power - Engine & Chassis

MZR-CD 2.2
High Power
Suspension and Wheels
Front suspension Double wishbone
Rear suspension Multilink
Damper front Twintube
Damper rear Twintube
Stabilizers (front / rear) mm 23/21
Wheel size inch 17 - 18
Tyre size 215/50R17 - 225/45R18
Steering
Type Rack and pinion
electric power assist
Steering wheel turns (lock to lock) 2.76
Turning circle (curb to curb) m 11.4
Turning circle (wall to wall) m 11.8
Brakes
Type front Ventilated discs
Type rear Discs
Diameter front mm 299
Diameter rear mm 280
Vacuum booster diameter inch 10
Scheduled maintenance Every 20,000 km /12 months
Mazda6 MZR-CD 2.2-litre Turbo Diesel Mid Power - Engine & Chassis

MZR-CD 2.2
Mid Power
Engine Type In-line 4-Cylinder DOHC, 16-Valve
Turbo-charged diesel
Displacement cm3 2,184
Bore x stroke mm 86 x 94
Valves 4
Camshaft drive Chain
Fuel injection system Electrically controlled direct-injection
Common-rail
Compression ratio 16.3 : 1
Emission control system Electrically controlled with catalyst and diesel
particulate filter system
Max. power kW 120 at 3,500 rpm
PS 163 at 3,500 rpm
Max. torque Nm 360 at 1,800 to 3,000 rpm
Fuel type Diesel Fuel tank capacity l 64
Engine oil capacity l 4.7 with oil filter
Battery 95D31L
Transmission 6-speed manual
Powertrain Front-wheel drive
Gear ratios
1st 3.538
2nd 1.913
3rd 1.290
4th 0.926
5th 0.853
6th 0.711
Reverse 3.831
Final Drive Ratio (1st – 4th)/
(5th, 6th, Rev.) 3.611/3.095

Mazda6 MZR-CD 2.2-litre Turbo Diesel Mid Power - Engine & Chassis

MZR-CD 2.2
Mid Power
Suspension and Wheels
Front suspension Double wishbone
Rear suspension Multilink
Damper front Twintube
Damper rear Twintube
Stabilizers (front / rear) mm 23/21
Wheel size inch 17 - 18
Tyre size 215/50R17 - 225/45R18
Steering
Type Rack and pinion
electric power assist
Steering wheel turns (lock to lock) 2.76
Turning circle (curb to curb) m 11.4
Turning circle (wall to wall) m 11.8
Brakes
Type front Ventilated discs
Type rear Discs Diameter front mm 299
Diameter rear mm 280
Vacuum booster diameter inch 10
Scheduled maintenance Every 20,000 km /12 months

Mazda6 MZR-CD 2.2-litre Turbo Diesel Low Power - Engine & Chassis

MZR-CD 2.2
Low Power
Engine Type In-line 4-Cylinder DOHC, 16-Valve
Turbo-charged diesel
Displacement cm3 2,184
Bore x stroke mm 86 x 94
Valves 4
Camshaft drive Chain
Fuel injection system Electrically controlled direct-injection
Common-rail
Compression ratio 16.3 : 1
Emission control system Electrically controlled with catalyst and diesel
particulate filter system
Max. power kW 92 at 3,500 rpm
PS 125 at 3,500 rpm
Max. torque Nm 310 at 1,800 to 2,600 rpm
Fuel type Diesel
Fuel tank capacity l 64
Engine oil capacity l 4.7 with oil filter
Battery 95D31L
Transmission 6-speed manual
Powertrain Front-wheel drive
Gear ratios
1st 3.538
2nd 1.913
3rd 1.290
4th 0.926
5th 0.853
6th 0.711
Reverse 3.831
Final Drive Ratio (1st – 4th)/
(5th, 6th, Rev.) 3.611/3.095

Mazda6 MZR-CD 2.2-litre Turbo Diesel Low Power - Engine & Chassis

MZR-CD 2.2
Low Power
Suspension and Wheels
Front suspension Double wishbone
Rear suspension Multilink
Damper front Twintube
Damper rear Twintube
Stabilizers (front / rear) mm 23/21
Wheel size inch 16 - 17
Tyre size 205/60R16 - 215/50R17
Steering
Type Rack and pinion
electric power assist
Steering wheel turns (lock to lock) 2.76
Turning circle (curb to curb) m 11.4
Turning circle (wall to wall) m 11.8
Brakes
Type front Ventilated discs
Type rear Discs
Diameter front mm 299
Diameter rear mm 280
Vacuum booster diameter inch 10
Scheduled maintenance Every 20,000 km /12 months

Mazda6 MZR-CD 2.2-litre Turbo Diesel Sedan - Performance and Weights

MZR-CD 2.2 MZR-CD 2.2 MZR-CD 2.2
High Power Mid-Power Low Power
6-speed manual 6-speed manual 6-speed manual
Performance
Top speed km/h 218 212 195
Acceleration 0-100 km/h* s 8.3 9.0 10.6
Fuel Consumption**
Urban l/100 km 7.1 7.0 7.0
Extra urban l/100 km 4.7 4.7 4.7
Combined l/100 km 5.6 5.5 5.5
CO 2 emissions (combined) g/km 149 147 147
Emissions ranking Euro Stage IV Euro Stage IV Euro Stage IV
Weight and Payload
Min, kerb weight
(without driver) kg 1,455 1,445 1,445
Min. kerb weight*** kg 1,530 1,520 1,520
Max. permissible weight kg 2,065 2,055 2,055
Permissible front axle weight kg 1,180 1,170 1,170
Permissible rear axle weight kg 985 985 985
Permissible tow weight,
trailer without brakes kg 550 550 550
Permissible tow weight,
trailer with brakes
(12% slope) kg 1,600 1,600 1,600
Max. roof load capacity kg 100 100 100

* Under Mazda test conditions
** According to 80/1268/EEC in its latest version
*** According to 92/21/EEC in its latest version (including 75 kg driver)

Mazda6 MZR-CD 2.2-litre Turbo Diesel Hatchback – Performance and Weights

MZR-CD 2.2 MZR-CD 2.2 MZR-CD 2.2
High Power Mid-Power Low Power
6-speed manual 6-speed manual 6-speed manual
Performance
Top speed km/h 218 212 195
Acceleration 0-100 km/h* s 8.3 9.0 10.6
Fuel Consumption**
Urban l/100 km 7.1 7.0 7.0
Extra urban l/100 km 4.7 4.7 4.7
Combined l/100 km 5.6 5.5 5.5
CO 2 emissions (combined) g/km 149 147 147
Emissions ranking Euro Stage IV Euro Stage IV Euro Stage IV
Weight and Payload
Min. kerb weight
(without driver) kg 1,495 1,485 1,485
Min. kerb weight*** kg 1,570 1,560 1,560
Max. permissible weight kg 2,110 2,100 2,100
Permissible front axle weight kg 1,180 1,170 1,170
Permissible rear axle weight kg 1,030 1,030 1,030
Permissible tow weight,
trailer without brakes kg 550 550 550
Permissible tow weight,
trailer with brakes
(12% slope) kg 1,600 1,600 1,600
Max. roof load capacity kg 100 100 100
* Under Mazda test conditions
** According to 80/1268/EEC in its latest version
*** According to 92/21/EEC in its latest version (including 75 kg driver)

Mazda6 MZR-CD 2.2-litre Turbo Diesel Wagon –
Performance and Weights

MZR-CD 2.2 DE MZR-CD 2.2 DE MZR-CD 2.2 DE
High Power Mid-Power Low Power
6-speed manual 6-speed manual 6-speed manual
Performance
Top speed km/h 216 210 192
Acceleration 0-100 km/h* s 8.5 9.2 10.8
Fuel Consumption**
Urban l/100 km 7.2 7.0 7.0
Extra urban l/100 km 4.8 4.8 4.8
Combined l/100 km 5.7 5.6 5.6
CO 2 emissions (combined) g/km 152 149 149
Emissions ranking Euro Stage IV Euro Stage IV Euro Stage IV
Weight and Payload
Min. kerb weight
(without driver) kg 1,510 1,500 1,500
Min. kerb weight*** kg 1,585 1,575 1,575
Max. permissible weight kg 2,145 2,135 2,135
Permissible front axle weight kg 1,165 1,155 1,155
Permissible rear axle weight kg 1,075 1,075 1,075
Permissible tow weight,
trailer without brakes kg 550 550 550
Permissible tow weight,
trailer with brakes
(12% slope) kg 1,600 1,600 1,600
Max. roof load capacity kg 100 100 100


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