Modular intake manifold

The membrane film is kept at constant temperature (approximately 120°C higher than the intake air temperature) by a resistance.

The intake air crossing the channel tends to take heat from the membrane.

To keep temperature constant, therefore, a certain current must cross the element.

This current is measured by means of a specific Wheatstone bridge and is proportional to the air flow.

A flow meter directly measures the amount of air (not the volume) thus eliminating problems due to temperature, altitude, pressure, etc.

MODULAR INTAKE MANIFOLD

This modular length intake manifold is controlled by the injection ECU.

It increases volumetric performance and consequently:

• optimises torque output at low/medium ratios
• increases power at high ratios.

The manifold consists of:

• two half cases made in nylon
• an internal rocking manifold
• a vacuum accumulator inside the manifold
• a modular intake manifold actuator with an integrated three-way control solenoid valve.

OPERATION

The injection ECU controls the three-way solenoid valve (1) thus connecting the vacuum accumulator (2) and the pneumatic actuator (3) which, by means of specific linkages, controls the movement of the rocking manifold (4).

The rocking manifold rotation configures the manifolds as follows:

• short power manifolds for engine ratio over 4900 rpm.

• long torque manifolds for engine ratio from 800 to 4900 rpm.