New Generation N62 Engine
Chapter 3 P.4
Course Contents/Background Material
© BMW AG,
Service Training
- Intake manifold
General information
The N62 engine is fitted with a variable intake manifold to make
it possible to reach a generous torque curve, even at low engine
speeds, without incurring losses in engine output at higher
speeds. It ensures that the engine exhibits optimum volumetric
efficiency through the entire range of speeds.
A new feature is that on the N62, the variable intake manifold
intake pipe length can be adjusted depending on the engine
speed.
The various requirements on a good petrol engine are
multilayered, and often appear to be contrary to one another.
The most important requirements are:
- High engine output
- High engine torque at favourable engine speeds
- Favourable torque curve
- Low pollutant emissions
- Smooth engine operation over the entire speed range
- Good engine acoustics
- Low fuel consumption
To achieve these objectives, every component of the engine, the
exhaust system and the engine management system must be
optimally matched to one another.
A particularly important factor is cylinder filling and scavenging.
This is determined by the optimal matching of the intake pipe
dimensions, the exhaust system and the valve timing.
Good cylinder filling is the basic prerequisite for the fulfilment of
the requirements.
The complete air intake system, and to a certain extent the
intake manifold, contribute to optimum cylinder filling.
