Modular inlet manifold (v.i.s.)

Description 1072D

1.8 16v

Type

This is a modular length inlet manifold managed by the injection control unit which makes it possible to increase volumetric efficiency and thereby:

• improving the torque supply at low-medium speeds
• increasing the power at high speeds.

2.4 20v

Type

This is a modular length inlet manifold managed by the injection control unit which makes it possible to increase volumetric efficiency and thereby:

• improving the torque supply at low-medium speeds
• increasing the power at high speeds.

1.8 16v

Structure

The modular intake manifold consists of:

• two nylon half shells;
• a set of 4 throttles positioned on the same axis that open/close the short intake duct branches;
• a vacuum accumulator inside the manifold;
• a modular intake device control actuator

2.4 20v

Structure

The modular intake manifold consists of:

• two nylon half shells
• a vacuum accumulator inside the manifold
• an actuator controlling the modular intake device, with built-in two-way solenoid.

1.8 16v

Introduction

The fuel injection control unit controls the two-way solenoid (1) which places the vacuum accumulator (2) in communication with the pneumatic actuator (3), which in turn, via a linkage, allows the opening/closing of the throttles (4).

This movement allows the ducts to assume the following configurations;

intake from long ducts (from 2000 rpm to 5400 rpm, at medium/high engine load): in this position, the solenoid is not activated and the actuator is in rest position. The throttles are therefore closed and the engine takes in air from the long ducts to achieve high torque at medium speeds;

2.4 20v

OPERATION

The fuel injection control unit controls the two-way solenoid (1) which places the vacuum accumulator (2) in communication with the pneumatic actuator (3), which in turn, via a linkage, allows the oscillating pipe (4) to move.

The rotation of the rocker duct allows the manifolds to assume the following configurations:

long torque ducts for speeds up to 4700 rpm

1.8 16v

Introduction

intake from short ducts (under 2000 rpm and over 5400 rpm at medium/high load; especially at low rpm): in this position the solenoid is supplied and it places the actuator in communication with the vacuum reservoir, causing the throttles to open, so the engine draws from the short ducts, to obtain the maximum power.

2.4 20v

OPERATION

short power ducts for speeds above 4700 rpm

1.8 16v

Type

This two-way solenoid is located on the lower part of the intake manifold. It is controlled by the injection control unit.

Its function is to allow the vacuum present in the vacuum tank (inside the inlet chamber) to act on the pneumatic actuator which controls the oscillating pipe.

1, Solenoid

2, Actuator

3, Vacuum intake pipe

4, Atmospheric air intake

2.4 20v

OPERATION

Modular manifold engagement logic

A - Throttle position

B - Engine rpm

Type

This is a two-way solenoid valve integrated in the pneumatic inlet manifold actuator and is operated by the injection control unit.

Its function is to allow the vacuum present in the vacuum tank (inside the inlet chamber) to act on the pneumatic actuator which controls the oscillating pipe.

1 - Solenoid

2 - Actuator

3 - Vacuum intake pipe

4 - Atmospheric air intake