BMW N62B40 engine

In 2005, BMW Plant Dingolfing produced an engine model N62B40 to replace the N62B36 modification.

The prototype of the new development was model N62B48.

N62B40 engine specifications

Advantages

The cloned N62B40 engine received the same aluminum V-shaped cylinder block with cast iron liners, a new crankshaft, forged connecting rods. By reducing the stroke and piston diameter, the engine volume was reduced to 3996cm³.

The N62B40 engine is equipped with a modernized cylinder head, made of aluminum alloy with silicon, with a mechanism for transforming the valve lift – Valvetronic III, and an improved Bi-VANOS valve timing scheme. In order to improve fuel economy, power, reduce harmful emissions into the atmosphere, a system of changing the geometry of the intake manifold, regulated by DISA BMW, is implemented in the model under consideration.

This collector arrangement increases the powertrain efficiency and improves the technical characteristics. Its originality consists in the presence of manifold air ducts of different lengths, allowing to fill the cylinders with air in such quantity to ensure qualitative and efficient combustion of fuel. Optimization of air flow to the cylinder by increasing or decreasing the passage channel is the main advantage of the manifold cross-sectional system. This optimization allows the unit to increase torque at various crankshaft speeds. A short air line with a larger cross-sectional area helps increase the N62B40 engine’s power output at the rev limit, while reducing torque.

An extended air line with a small diameter helps increase the missing torque. N62B40 engine with direct injection of fuel into the cylinder, meets the general European requirements for maximum permissible emissions of combustion products into the atmosphere and complies with Euro-4 environmental standards. This is achieved by equipping the engine with an
advanced electronic engine management system Bosch DME ME 9.2.2, which was developed on the previous version ME 9.2.1.

Disadvantages

Of the most common problematic issues, service
center employees
highlight the following:

• Valvetronic is a very expensive valve train, with an inexpensive eccentric shaft on needle bearings, acting as an additional vacuum pump. One of the failures of the 2A5B
  during testing indicates wear of the motor brush assembly due to the constant presence of dust between the brushes and the collector;
• Bi-VANOS timing mechanism – installed on the intake valves, consisting of a piston moving forward/backward, using the engine oil pressure inside, influences the gears of the camshaft. The innumerable sealing rings on the piston lose their elasticity during prolonged operation and VANOS loses its performance, malfunctions appear in the power unit;
• Abnormal oil consumption – caused by “aging” of the oil sealing caps after 100,000 km of mileage. If they are not replaced in time, the likelihood of oil rings failing increases to a critical point;
• Oil leakage from the crankshaft oil seal or alternator housing gasket, which must be replaced to correct the leak;
• unstable engine operation may be caused by unauthorized air intake, failure of ignition coil, flow meter or Valvetronic.

Increase of engine life is achieved by timely execution of technological maintenance operations recommended by the manufacturer, do not save on the appropriate brand of gasoline, change engine oil strictly after the recommended mileage, fill the oil in accordance with the requirements of the technical data sheet.

Modifications

The engine N62B40 had a modification with a working volume of 4799cm³, output of 360hp at 6200rpm and designation N62B40TU. The novelty of the motor is determined by:

• Separate two-stage suction system with installation of 2 DISA servo motors with individual output stage;
• compliance with the European Euro-4 environmental standard without additional air mixture supply;
• constant monitoring of the oil level in the crankcase using electronic gauges;
• installation of a thermoanemometric air flow meter with digital display;
• application of digital analog of DME electronic motor control circuit 9.2.3.

Chip Tuning

Diversification of the electronic program engine control unit through firmware to improve technical capabilities – called chip tuning.

Application of high quality CRAFT program, developed on the basis of nanotechnology in the field of tuning for BMW models, guaranteeing quality control in all phases of motor operation and tested in real conditions on the latest equipment – successfully used on the engine N62B40.

The consequences of the N62B40 motor correction are:

• a significant increase in power to 340 hp;
• torque buildup;
• Gasoline savings through reduced consumption;
• increasing the comfort of the engine operating cycle.

In some cases it is practiced to install a compressor. However, the cost of self-installation of the turbo is not justifiably high with little efficiency of the measures taken.

This engine is installed on the following models:

BMW 5-Series (E60)

BMW 7-Series (E65)