EA837 or Audi V6 engines
The Audi EA837 series of 6-cylinder V-engines has been produced by the company since 2004 and is installed on almost all of the group’s models: 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. According to the design, there is a silumin block of the V6 type already without liners with a cylinder camber angle of 90°, two aluminum DOHC cylinder heads with roller rocker arms, as well as hydraulic compensators and a sophisticated timing drive with four chains, two intermediate gears, a balancer, and all this was located on the rear side, so to replace the chains the motor had to be removed. Another thing to note here is the sophisticated intake manifold with two rows of dampers.
The series included a 2.4-liter engine with distributed injection and phase regulators at the intake, and four more power units with FSI direct injection and phase regulators on all shafts:
- 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, production of the second generation of engines from the EA837 family began. These units were distinguished by the presence of a system for varying the degree of opening of the intake valves AVS, a two-stage oil pump, an injection pump with a roller tappet and an updated timing drive with more reliable tensioners, trioval sprockets and new roller chains. This time, all power units of this family were equipped with an FSI direct injection system.
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);
- CPVA (direct injection, 220 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 V6 engines debuted on the restyled version of the A6 model, which were primarily distinguished by the presence of an Eaton compressor with a built-in cooler. The aluminum block, heads and timing chain drive were redesigned for greater power, but the proprietary AVS system and phase regulators on the exhaust shafts had to be abandoned. The control here is carried out by a Siemens Simos 8 ECU, and a Hitachi HDP 3 fuel injection pump is used.
Thanks to the adjustment of the degree of boost, many modifications of such engines were created:
- CAJA (direct injection, 290hp / 420 Nm) for Audi A6 C6 (4F);
- CAKA (direct injection, 333hp / 440 Nm) for Audi S4 B8 (8K), S5 1 (8T);
- CCAA (direct injection, 300hp / 440 Nm) for Audi A6 C6 (4F), A6 C7 (4G);
- CCBA (direct injection, 333hp / 440 Nm) for Audi S4 B8 (8K);
- CHMB (direct injection, 272hp / 400 Nm) for Audi A5 1 (8T);
- CGWA (direct injection, 290hp / 420 Nm) for Audi A8 D4 (4H);
- CGWB (direct injection, 300hp / 440 Nm) for Audi A6 C7 (4G), A7 C7 (4G);
- CGWC (direct injection, 333hp / 440 Nm) for Audi S4 B8 (8K), S5 1 (8T);
- CGWD (direct injection, 310hp / 440 Nm) for Audi A6 C7 (4G), A7 C7 (4G);
- CGXA (direct injection, 290hp / 420 Nm) for Audi A8 D4 (4H);
- CGXB (direct injection, 310hp / 440 Nm) for Audi A6 C7 (4G), A7 C7 (4G);
- CGXC (direct injection, 333hp / 440 Nm) for Audi A8 D4 (4H);
- CJTB (direct injection, 333hp / 440 Nm) for Audi Q7 1 (4L);
- CJTC (direct injection, 272hp / 400 Nm) for Audi Q7 1 (4L);
- CJWB (direct injection, 333hp / 440 Nm) for Audi Q7 1 (4L);
- CJWC (direct injection, 272hp / 400 Nm) for Audi Q7 1 (4L);
- CJWE (direct injection, 280hp / 400 Nm) for Audi Q7 1 (4L);
- CMDA (direct injection, 333hp / 440 Nm) for Audi A8 D4 (4H);
- CMUA (direct injection, 272hp / 400 Nm) for Audi A4 B8 (8K), A5 1 (8T);
- CNAA (direct injection, 333hp / 440 Nm) for Audi Q7 1 (4L);
- CTDA (direct injection, 333hp / 440 Nm) for Audi A8 D4 (4H);
- CTTA (direct injection, 310hp / 440 Nm) for Audi A7 C7 (4G);
- CTVA (direct injection, 272hp / 400 Nm) for Audi Q5 1 (8R);
- CTUA (direct injection, 310hp / 440 Nm) for Audi A6 C7 (4G), A7 C7 (4G);
- CTUB (direct injection, 333hp / 440 Nm) for Audi A8 D4 (4H);
- CTUC (direct injection, 272hp / 400 Nm) for Audi Q5 1 (8R);
- CTUD (direct injection, 354hp / 470 Nm) for Audi SQ5 1 (8R);
- CTXA (direct injection, 354hp / 470 Nm) for Audi SQ5 1 (8R);
- CTWA (direct injection, 333hp / 440 Nm) for Audi Q7 1 (4L);
- CTWB (direct injection, 280hp / 400 Nm) for Audi Q7 1 (4L).
There are also two hybrid versions with the index CGEA and CGFA for the Touareg Hybrid model.
Engines EA837 EVO 3.0 TFSI
In 2013, the second generation of 3.0 TFSI engines or the fourth generation for the EA837 appeared. The main difference between the new engines was the change from direct fuel injection to combined, that is, a second row of injectors was added that inject fuel into the intake manifold. They also returned the exhaust phase regulators and added an electromagnetic clutch to the compressor, and the cylinder block, cylinder head and connecting rod-piston group were revised to accommodate the compression ratio, which had increased from 10.5 to 10.8. Another important innovation is the replacement of the alusil coating with cast iron sleeves.
- CREA (combined injection, 310 hp / 440 Nm) for Audi A8 D4 (4H);
- CREC (combined injection, 333 hp / 440 Nm) for Audi A8 D4 (4H), Q7 2 (4M);
- CRED (combined injection, 272 hp / 400 Nm) for Audi A4 B8 (8K), A5 1 (8T);
- CREG (combined injection, 290 hp / 420 Nm) for Audi A8 D4 (4H);
- CREH (combined injection, 340 hp / 440 Nm) for Audi A6 C7 (4G), A7 C7 (4G).
In 2016, the latest turbocharged V6 units of the EA839 family were introduced and they gradually replaced the EA837 series; the last to abandon them was the Q7 crossover in 2020.
| Engine | Years | Volume | Power | Fuel | Timing | Oil | Lifespan |
|---|---|---|---|---|---|---|---|
| Audi AUK | 2004–2010 | 3.1 L | 256 hp | petrol | chain | 6.5 L | ~260 000 km |
| Audi BDW | 2004–2008 | 2.4 L | 177 hp | petrol | chain | 6.5 L | ~280 000 km |
| Audi BDX | 2006–2010 | 2.8 L | 210 hp | petrol | chain | 6.2 L | ~250 000 km |
| Audi CAJA | 2008–2011 | 3.0 L | 290 hp | petrol, turbo | chain | 6.5 L | ~250 000 km |
| Audi CGWA | 2009–2013 | 3.0 L | 290 hp | petrol, turbo | 4 chains | 6.5 L | ~240 000 km |
| Audi CGWB | 2010–2012 | 3.0 L | 300 hp | petrol, turbo | 4 chains | 6.5 L | ~260 000 km |
| Audi CREC | 2014–present | 3.0 L | 333 hp | petrol, turbo | chain | 6.8 L | ~250 000 km |
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