BMW 6 series 2004 4.4 petrol description
Cabrio BMW 645Ci Cabrio has been produced from April, 2004 to September, 2005. It has eight-cylinder petrol engine with displacement of 4.4 litres, which produces power of 333 horsepower on 6100 rpm and torque 450 Nm (Newton metres) on 3600 revolutions per minute.
This 8-cylinder 32-valve engine camshaft is driven by chain (What is an engine chain and belt? ). Engine has fuel injection system, this is an atmospheric engine (without turbine). Engine versions compliant with Euro 3 and Euro 4 emission standards available. Engine lifespan (mileage before major repairs or overhaul) can last from 280 up to 480 thousand kilometres. Remember that engine life depends on regular maintenance and the quality of the materials used (oils, fuels, etc.).
More engine specs
The main problems with the N62 engine are related to malfunctions in the Valvetronic and VANOS ...
This BMW 6 series 4.4 engine oil type is 5W-30 and oil capacity is 8 litres.
BMW 645Ci Cabrio has classical rear wheel drive (RWD) and manual gearbox with 6 gears.
BMW 645Ci Cabrio accelerates to speed 100 kilometres per hour in 6.1 seconds. The maximum speed of this car is 250 km/h.
BMW 645Ci Cabrio fuel consumption is 13 litres per 100km in combined city/highway mode (7.7 km/l), fuel consumption in city - 18 l/100km, highway fuel economy - 9.6 l/100km. Fuel tank capacity is 70 litres or 18.49 gallons, which gives a mileage up to 520 kilometers without refueling in urban cycle and even up to 720 kilometers on highway.
According to user reviews, the real everyday fuel consumption of this BMW is in line with, and sometimes even lower than, the manufacturer's stated combined consumption. More - Real BMW 6 series fuel consumption.
BMW 645Ci Cabrio technical data
| Model: | BMW 645Ci Cabrio | ||
|---|---|---|---|
| Body style: | Cabrio | ||
| Production period: | 2004. April ... 2005. September | ||
| Engine: | 4398 cm3 Petrol, 8 cylinders | CO2 emissions: | 310 g/km |
| Power: | 333 HP ON 6100 RPM | Torque: | 450 NM ON 3600 RPM |
| Gearbox: | Manual gearbox (6 gears) | Drive type: | Rear wheel drive (RWD) |
| Top speed: | 250 km/h | Acceleration 0-100 km/h: | 6.1 seconds |
| Fuel consumption (l/100km): | 13.0 (combined) 18.0 (urban) 9.6 (highway) | ||
| Real fuel consumption: | 13.4 l/100km (17.6 MPG) by user reviews from various sources | ||
| Fuel tank capacity: | 70 litres (18.5 gallons) | ||
| Car dimensions: | 4.82m (length) 1.86m (width) 1.37m (height) | ||
| Turning diameter: | 11.4 meters | ||
| Trunk capacity: | 300 litres | ||
| Trunk max capacity: | 350 litres (with rear seats folded down) | ||
| Gross weight: | 2215 kg | ||
BMW 645Ci Cabrio engine N62B44
Engine reliability and common problems:
The main problems with the N62 engine are related to malfunctions in the Valvetronic and VANOS systems. Fluctuating idle is usually caused by ignition coil failure, air leaks, MAF sensor problems or problems in the Valvetronic system.Another common problem is increased oil consumption due to valve stem seal wear. Typically, oil consumption problems start around 100,000km, with worn valve stem seals being the main cause. After a further 100,000km the oil control rings often fail.
Oil leaks from the generator housing gasket and crankshaft seal are also common.
As mileage increases, debris from a deteriorating catalytic converter can be sucked into the cylinders, causing significant damage. To minimise problems and extend engine life, it is essential to use high quality oil and fuel and to carry out regular maintenance.
Overall, this engine can last around 280,000 to 480,000 km if properly maintained, using the correct quality oil and fuel, and carrying out regular checks and maintenance.
The engine has hydraulic valve tappets (lifters), which provide quieter operation and do not require periodic adjustment, but are more complex in design and can cause serious engine damage in the event of failure.
| Engine displacement | 4398 cm3 |
|---|---|
| Number of cylinders | 8 |
| Bore (cylinder diameter) | 92 mm |
| Stroke length (piston move) | 82.7 mm |
| Compression ratio | 10 : 1 |
| Camshaft drive | Timing chain Chain motors are considered more reliable, chain replacement usually is required less often than a timing belt, but they are often louder and vibrate more. |
| Fuel system | Injection |
| BMW 645Ci Cabrio oil type | 5W-30 |
| Oil capacity | 8 litres (8.5 quarts) |
| Coolant capacity | 13.8 litres (14.6 quarts) |
| Power | 320 - 333 HP ON 6100 RPM |
| Torque | 440 - 450 NM ON 3600 RPM |
| Start of production (year) | 2001 |
| Duration of production | 9 years |
| Engine also used on | BMW 5 sērija BMW X5 BMW 7 sērija |
Generally, the use of an engine in several models and its long production run is an indication of the quality of the engine and the success of its design. |
All BMW 6 series cabrio [2004 - 2007] modifications
| Modification | Engine | Power | Consumption | Gearbox |
|---|---|---|---|---|
|
BMW 630i Cabrio
Sep 2004 — Sep 2007 Most fuel efficient version |
3.0 Petrol | 258 HP | 9.6 l/100km | Manual (6) |
| BMW 630i Cabrio Sep 2004 — Sep 2007 | 3.0 Petrol | 258 HP | 9.9 l/100km | Automatic (6) |
| BMW 645Ci Cabrio Apr 2004 — Sep 2005 | 4.4 Petrol | 333 HP | 13.0 l/100km | Manual (6) |
| BMW 645Ci Cabrio Apr 2004 — Sep 2005 | 4.4 Petrol | 333 HP | 12.0 l/100km | Automatic (6) |
|
BMW 650i Cabrio
Sep 2005 — Sep 2007 Most dynamic version - 100 km/h in 5.7 seconds |
4.8 Petrol | 367 HP | 13.0 l/100km | Manual (6) |
|
BMW 650i Cabrio
Sep 2005 — Sep 2007 Most powerfull version (367 HP) |
4.8 Petrol | 367 HP | 12.0 l/100km | Automatic (6) |