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]
References
[edit]- ^ VarioRAM Explained at the Wayback Machine (archived 8 August 2013)
- ^ "How and why a VarioRAM works". instant-g.com. Retrieved 2018-08-01.
- ^ "Technology explained: VarioRam". total911.com. Retrieved 2018-08-01.
- ^ "October 1995: A new Targa, Varioram and more join the 911 lineup". autoweek.com. Retrieved 2018-08-01.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction