Table of Contents
Advertisement
Variable intake manifold
The figure shows the two-stage variable intake
manifold fitted in the Phaeton.
It is comprised of the variable intake manifold
change-over valve, two vacuum units with adjusting
levers, a non-return valve, the hoses and the vacuum
reservoir in the front area of the vehicle.
Change-over
- From the torque position (long intake tract) to the
output position (short intake tract) at 4600 rpm.
- From the output position to the torque position at
4440 rpm.
Torque position
Long intake ports are used in the torque position. This
leads to a high flow speed, extensive turbulence in the
cylinder, very good fuel/air mixing andrapid
combustion. In turn, this results in the development of
high torque.
Output position
Short intake ports with the largest possible cross-
sections are used in the output position. This results in
high air throughput with good charging. In turn, this
leads to high power output.
Variable intake manifold
change-over valve N156
S341_014
Non-return valve
Adjusting levers
Vacuum units
S341_015
S341_013
9
Hide quick links:
Advertisement
Table of Contents
