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Expansion intake manifold 911 Turbo S Cabriolet

Porsche 911 Turbo S Cabriolet - Expansion intake manifold

Expansion intake manifold

More power for less fuel. Sounds paradoxical, but it’s really quite simple. You just have to have the nerve to question the norm.

For instance with the expansion intake manifold in the 911 Turbo models. With a traditional resonance manifold, more air means more power. The compression effect in the intake system is used to press as much of the fuel/air mixture as possible into the cylinders. Unfortunately, compression not only increases air volume, it also increases air temperature. And this has a negative effect on the ignition.

Our expansion manifold turns that principle around. The internal geometry is radically different from that of a resonance intake system. Key modifications include a longer distributor pipe, with a smaller diameter, and shorter intake pipes. As a result, the air is in the expansion phase as it enters the combustion chambers. Since expansion always cools, the air/fuel temperature is lower and ignition is significantly improved – thereby increasing performance.

The amount of air that enters the engine under expansion is less than it would be under compression. To compensate for this, we’ve simply increased the boost pressure. The resulting increase in temperature – again through compression – is immediately offset by the uprated intercoolers.

Instead of hot compressed air entering the combustion chambers, we now have cooler air generating more power and torque. As a consequence, there is a major improvement in engine efficiency. And therefore lower fuel consumption, even under heavy loads and at high revs.

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