New Porsche Exhaust Muffler Will Work As A Diffuser

Scoop / 6 Comments

Why has nobody thought of this before?

Porsche has filed to protect a novel new idea that would see the exhaust muffler of a car like the Porsche 911 double as an aerodynamically-effective rear diffuser. The patent was discovered by CarBuzz at the German Patent and Trade Mark Office, and it appears to be simple enough to enter production as soon as the required tooling is produced.

Specifically, the invention is described as a "rear silencer in an exhaust system, the underside of which is aerodynamically shaped and can be equipped with air-guiding elements."

As explained by ScienceDirect in a journal on the matter, we know that the placement of an exhaust exit can affect the aerodynamic properties of a car thanks to where that hot air is expelled in the car's wake, but this has relatively minor effects. An aerodynamically sculpted underbody, however, always provides meaningful benefits.

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Simply put, the Porsche-designed muffler would feature depressions or elevations intended to channel the airflow in the underbody area of the car towards the rear in a streamlined fashion. As we alluded to above, this design would find the greatest benefits if implemented in conjunction with a flat underbody.

Ideally, the muffler should extend across the entire width of the vehicle and would be relatively long too, but the space savings possible by making the muffler flatter are specifically noted as a motivating potential advantage. Of course, Porsche could also rework the idea to apply it to two silencers/mufflers with channels between them. Various shapes for the air guide channels are proposed, including a V-shape, a U-shape, and a T-shape.


Porsche also suggests that these air guide elements could be manually or automatically adjusted, potentially based on factors like vehicle speed and drive mode. Porsche loves giving its buyers toys to fine-tune the driving experience - the latest GT3 RS is proof of that - but what potential hurdles lie ahead?

The most obvious is that of heat management. For one thing, the elements attached to or part of the muffler would need to be very resistant to high latent temperatures. For another, the muffler itself would need to be configured in such a way that thermal expansion and contraction do not negatively impact the efficacy of the diffuser element.

The choice of materials and heat shielding components would be critical, but other than that, we would not be surprised to see this kind of idea find its way to something like the next GT2 RS. There are already several potential technological advances coming to that car, including remote camber adjustment.

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