BMW N62B44 Engine


  1. Specifications
  2. Overview, problems
  3. Performance tuning

N62B44 Specs

Manufacturer  BMW Plant Dingolfing
Also called BMW N62
Production 2001-2006
Cylinder block alloy Aluminum
Configuration V8
Valvetrain DOHC
4 valves per cylinder
Piston stroke, mm (inch) 82.7 (3.26)
Cylinder bore, mm (inch) 92 (3.62)
Compression ratio 10
10.5
Displacement 4398 cc (268.4 cu in)
Power output 235 kW (320 HP) at 6,100 rpm
245 kW (333 HP) at 6,100 rpm
Torque output 440 Nm (325 lb·ft) at 3,700 rpm
450 Nm (332 lb·ft) at 3,600 rpm
Redline 6,500 rpm
HP per liter 72.8
75.7
Fuel type Gasoline
ECU Bosch DME ME9.2
Weight, kg (lbs) 213 (470)
Fuel consumption, L/100 km (mpg)
-City

-Highway
-Combined
for E65 745i
15.5 (15.2)
8.3 (28.3)

10.9 (21.6)
Turbocharger   Naturally aspirated
Oil consumption , L/1000 km
(qt. per miles)
up to 1.0
(1 qt. per 750 miles)
Recommended engine oil 5W-30
5W-40
Engine oil capacity, L (qt.) 8.0 (8.45)
Oil change interval, km (miles) 7,000-10,000
(4,500-6,000)
Normal engine operating temperature, °C (F) ~105 (220)
Engine lifespan, km (miles)
-Official information
-Real


400+ (250)
Tuning, HP
-Max HP
-No life span loss

600+

The engine is installed in BMW 545i E60/E61
BMW 645i E63/E64
BMW 745i/745Li E65/E66
BMW X5 E53
Morgan Aero 8

BMW N62B44 engine reliability, problems and repair

The next generation of N62B44 V8 was launched in 2001, having replaced M62B44. Comparing to the previous model, the BMW N62 engines had series of innovations, such as Valvetronic and Dual-VANOS. Besides, their ecological ratings were improved, and also the power and torque increased. For the N62B44 a new aluminum cylinder block with cast-iron crankshaft was applied. The lightened aluminum pistons and forged piston rods were also used.

The cylinder head gasket is made of laminated steel, it is 6 mm thick. The cylinder head have been developed anew. For the N62 the variable valve lift system Valvetronic is used. It changes the valve lift on the intake camshaft. Besides, the variable valve timing system on the inlet and exhaust valves Double-VANOS is updated. The camshafts are cast-iron: duration 282/254 deg, lift 0.3-9.85/9.7 mm. The inlet valves are 35 mm in diameter, the outlet are 29 mm.
In timing an unattended chain is used. The intake manifold is variable-length. The maximal length is used on low revolutions, to 3500 rpm. The engine control unit is Bosch DME ME 9.2. BMW N62 firing order – 1-5-4-8-6-3-7-2.
This power unit is used for the models BMW 45i.
On base of the N62B44 a junior 3.6-liter version N62B36 was launched.

Producing of the 4.4-liter engine was stopped in 2006, and instead they started installing the N62B48 (N62TU). Its displacement was 4.8 liters and it was powerful still more.

BMW N62B44 engine problems and issues

1. High oil consumption. As a rule, the problems of high oil consumption on N62 appear when mileage reaches about 50,000 – 60,000 miles (100,000 km), and the reason is the valve stem seals. In 40,000 – 50,000 miles (50,000 – 100,000 km) more the oil scraper rings get out of order.

2. Rough idling. The irregular work of the engine is often connected with failed ignition coils. You should check them, replace, and the engine will work normally. There may be some other possible reasons yet, such as air inflow, or failing of the air flow sensor, or some problems with Valvetronic.

3. Oil leaking. Mainly crankshaft oil seal or alternator bracket gasket may leak. Replace them and leaking will stop.

In addition, on the N62 catalytic converters destroy with time and their cells get to the cylinders. It causes scoring in the cylinder blocks. Therefore it would be better to remove the catalytic converters and to install cat-backs instead.
To reduce the number of possible problems with the BMW N62, use the engine oil recommended by the manufacturer. Serve the engine regularly and its in-service life will be maximally long.

BMW N62 engine number location

You can see the number of the engines N62 or N62TU on the left side of the engine under the exhaust manifold.

BMW N62 B44 engine tuning

The N62B44 Supercharger

Supercharger kit is quite a simple, but rather effective way to increase the power of the BMW N62 B44. Everything we need is purchasing a supercharger kit (ESS TVS2/TVS1, for example) and installing it on stock internals N62. It might be as well to buy the performance exhaust system along with it. At the maximal pressure 7 psi, your N62B44 will produce about 430-450 HP.
The shortcoming of this method is its cost. So, perhaps it would be easier to buy used BMW M5 E60 or M6 E63 with the perfect sporty engine S85 V10.

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