The 2.4-liter Audi BDW 2.4 MPI injection engine was assembled at the factory from 2004 to 2008 and installed only on the popular A6 model in the C6 body in a modification before restyling. This unit was the only engine in the line with distributed fuel injection.
EA837 or Audi V6 engines
A series of 6-cylinder V-engines Audi EA837 has been produced by the company since 2004 and is installed on almost all models of the concern: from the compact A4 to the Q7 crossovers. These engines are divided into four generations, differing in the type of injection and the presence of turbocharging.
EA837 2.4 MPI and 3.2 FSI engines
In 2004, the engines of the EA835 family were replaced by new power units of the EA837 series. The first generation engine line received a silumin cylinder block already without liners and a very complex timing drive: four chains, two intermediate gears and a balance shaft. All camshafts had phase regulators, and the intake manifold had two sets of dampers at once.
The line consisted of a 2.4-liter engine with conventional injection and 3.2-liter engines with direct injection:
- BDW (distributed injection, 177 hp / 230 Nm);
- AUK (direct injection, 256 hp / 330 Nm);
- BKH (direct injection, 256 hp / 330 Nm);
- BPK (direct injection, 260 hp / 330 Nm);
- BYU (direct injection, 249 hp / 330 Nm).
EA837 2.8 and 3.2 FSI engines
Already in 2006, the production of power units of the second generation of the EA837 family began. The difference between the new engines was the aluminum block and the AVS valve control system. Defective timing chain tensioners were upgraded, their reliability increased slightly.
The updated series consisted only of engines with direct fuel injection of 2.8 and 3.2 liters:
- BDX (direct injection, 210 hp / 280 Nm);
- CCDA (direct injection, 190 hp / 280 Nm);
- CCEA (direct injection, 220 hp / 280 Nm);
- CHVA (direct injection, 204 hp / 280 Nm);
- CALA (direct injection, 265 hp / 330 Nm);
- CALB (direct injection, 270 hp / 330 Nm).
EA837 3.0 TFSI engines
In 2008, the third generation of V6 engines debuted on the restyled version of the A6 model. These units, in addition to direct fuel injection, received turbocharging in the form of an Eaton compressor. The aluminum block, cylinder head and timing chain drive have been redesigned for more power. The control here is carried out by the Siemens Simos 8 ECU, the Hitachi injection pump of the HDP 3 type is used.
Thanks to the adjustment of the degree of boost, many modifications of such engines were created:
- CAJA (direct injection, 290 hp / 420 Nm);
- CAKA (direct injection, 333 hp / 440 Nm);
- CGWA (direct injection, 290 hp / 420 Nm);
- CGWB (direct injection, 300 hp / 440 Nm);
- CGWC (direct injection, 333 hp / 440 Nm);
- CGWD (direct injection, 310 hp / 440 Nm);
- CMUA (direct injection, 272 hp / 400 Nm);
- CTVA (direct injection, 272 hp / 400 Nm);
- CTUC (direct injection, 272 hp / 400 Nm);
- CTUD (direct injection, 354 hp / 470 Nm);
- CTWA (direct injection, 333 hp / 440 Nm);
- CTWB (direct injection, 272 hp / 400 Nm).
Engines EA837 EVO 3.0 TFSI
In 2013, Audi 3.0 TFSI Gen2 engines or the fourth generation of V6 engines appeared. The difference between the new engines was the replacement of direct fuel injection with a combined MPI + FSI. Phase regulators also appeared at the exhaust, and not just at the intake, like their predecessors; and the cylinder block, cylinder head and connecting rod and piston group were revised to increase the compression ratio from 10.5 to 10.8.
- CREA (MPI + FSI, 310 hp / 440 Nm);
- CREC (MPI + FSI, 333 hp / 440 Nm);
- CRED (MPI + FSI, 272 hp / 400 Nm).
In 2016, the latest turbocharged V6 units of the EA839 family were introduced and they gradually replaced the EA837 units, which are now installed only on Q7 crossovers.
The company assembled the 3.2-liter 24-valve Audi AUK 3.2 FSI engine from 2004 to 2010 and installed it on such popular models of the German concern as the A4 B7, A6 C6 or A8 D3. This power unit has several analogues at once with other BKH, BPK and BYU indices.
The 2.8-liter Audi BDX 2.8 FSI engine was produced at the company’s factories from 2006 to 2010 and was installed only on two models of the German concern: the A6 in the back of the C6 or the A8 in the back of the D3. This power unit has several analogues at once under the …
The 3.0-liter turbocharged Audi CAJA 3.0 TFSI engine was produced from 2008 to 2011 and was installed only on the restyled version of the sixth generation A6 model with all-wheel drive. There was an analogue of this power unit for the American market under the CCAA index.
The 3.0-liter Audi CGWA 3.0 TFSI engine was assembled at the concern’s factories from 2009 to 2013 and was installed on the fourth-generation all-wheel drive modification of the A8 model before restyling. This power unit was essentially a slightly updated version of the engine under the CAJA index.
The 3.0-liter Audi CGWB 3.0 TFSI gasoline engine was assembled at the factory from 2010 to 2012 and installed on all-wheel drive versions of the popular A6 and A7 models in the C7 body before restyling. There was also a more powerful version of this power unit under a different CGWD index.
The 3.0-liter Audi CREC 3.0 TFSI turbo engine has been produced at the concern’s factories since 2014 and is installed on such popular models of the German company as the A6, A7 and the Q7 crossover. This unit is equipped with combined fuel injection and belongs to the EA837 EVO series.