by GreenSolara01 » Thu Aug 27, 2009 7:29 pm
The Acoustic Control Induction System (ACIS) improves the torque in the
whole RPM range, especially that in the low-speed range, by changing the
intake manifold length in stages. The intake manifold length is varied in
stages by optimum control of the intake air control valve(s). The air flow
in the intake pipe pulsates due to opening and closing of the engine
intake valves. When an intake valve is closed, the air near the valve is
compressed by the inertia force. This compressed air pushes off the
intake valve at high speed toward the intake chamber. If the intake manifold
length and intake chamber shape are set to cause the compressed air
pressure to return to an engine intake valve during the intake stroke, the
intake air volume is increased improving volumetric efficiency. This is
called the intake inertia effect. This improves torque and horsepower.
The ACIS changes the intake manifold length in stages according to the
pulsating flow cycle that varies with the engine speed and throttle valve
opening.
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GreenSolara01 - SolaraGuy Driver
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