VarioRam is a Porsche-patented engine induction system that was first introduced on the 1992 model year 964 Carrera RS motorsport special. It became standard on the 911-series starting from the M64/21 engine on the model year 1996.
As the name suggests, VarioRam varies the effective length of the inlet ducting depending upon engine load and speed. A long intake length at low rpm provides a better pulse tune because the pulse won't travel back and forth as many times, which aids low-end torque because the high pressure pulse may otherwise contribute to reversion and thereby decreased volumetric efficiency. At higher engine rpm, the intake length is reduced. The result is a flatter torque curve, with more torque available at low- and mid-range engine speeds compared to a similar non-VarioRam engine.[1][2][3][4]
 | This article about an automotive technology is a stub. You can help Wikipedia by expanding it. |
|
| |||||||
|---|---|---|---|---|---|---|---|
| Volkswagen Group marques & companies |
| ||||||
| Cars |
| ||||||
| Tractors |
| ||||||
| Motorsport |
| ||||||
| Engines and technologies |
| ||||||
| People |
| ||||||
| See also |
| ||||||
| |||||||
