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Porsche 996 GT3's resonance intake system. Note: 2 Intakes connect between the 2 plenums.
Porsche 996 GT3's resonance intake system. Note: 2 Intakes connect between the 2 plenums.
Resonance Intake Manifold: Boxer engines and V-type engines (but not inline engines) may employ resonance intake manifold to boost mid to high rev efficiency.

Each bank of cylinders are fed by a common plenum chamber through separate pipes. The two plenum chambers are interconnected by two pipes of different diameters. One of the pipes can be closed by a valve controlled by engine management system.
The firing order is arranged such that the cylinders breath alternately from each Combustion Chamber, creating pressure wave between them. If the frequency of pressure wave matches the rev, it can help filling the cylinders, thus improved breathing efficiency. As the frequency depends on the cross-sectional area of the interconnecting pipes, by closing one of them at low rev, the area as well as frequency reduce, thus enhance mid-rev output. At high rpm, the valve is opened thus improves high-speed cylinder filling.

Resonance intake system has been used in various Porsche starting from 964 Carrera. Since 993, Porsche combined it with an additional variable length manifold to form a 3-stage intake system names Varioram. However, it is very space-engaging so that the 996 employs only the resonance intake system. Honda NSX is another rare applicant for resonance intake system.
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