Intake Pipes

An intake pipe system for a multicylinder internal combustion engine,

with

an intake distributor (2),

a first set of individual intake pipes (4 to 9) positioned side by side and

extending from the intake distributor and each leading to a cylinder,

a set of shorter second individual intake pipes (12) extending from the

intake distributor (2) and each ending in a first individual intake pipe,

and

pivoting valves (14) for blocking or clearing the second set of individual

intake pipes,

wherein the intake distributor (2) and the first and second sets of

individual intake pipes (6 to 9 and 12) are made up of an integral casting

(1) having a longitudinal bore (16) intersecting the second set of

individual intake pipes (12), and wherein there is introduced into this

longitudinal bore a casing (15) having a central through bore (19) and

openings (17) aligned with the second set of individual intake pipes (12),

in each of which openings a pivoting valve (14) is mounted on a shaft (20)

extending through the through bore (19).

2. An intake pipe system as claimed in claim 1, wherein the intake

distributor (2) is tubular, the first set of individual intake pipes (4 to

9) extend through an arc of more than 270Ð'o around the intake

distributor, every other individual intake pipe extends parallel to the

associated first individual intake pipe radially inside which it extends

and has with it a common wall (13) and ends in the first individual intake

pipe near the end of the first individual intake pipe on the cylinder

side.

3. An intake pipe system as claimed in claim 1 or claim 2, wherein the

longitudinal bore (16) intersects the second set of individual intake

pipes (12) near their junction with the first set of individual intake

pipes.

4. An intake pipe system as claimed in claims 1 or 2 for an internal

combustion engine with two cylinder banks arranged