Engineering:VarioRam: Difference between revisions

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'''VarioRam''' is a [[Company:Porsche|Porsche]]-patented engine induction system that was first introduced on the 1992 model year [[Engineering:Porsche 964|964]] Carrera RS motorsport special. It became standard on the 911-series starting from the M64/21 engine on the model year 1996.
'''VarioRam''' is a [[Company:Porsche|Porsche]]-patented engine induction system that was first introduced on the 1992 model year [[Engineering:Porsche 911 (964)#Carrera RS variants|964 Carrera RS]] motorsport special. It became standard on the [[Engineering:Porsche 911|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 [[Physics:Torque|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.<ref>{{webarchive |url=https://web.archive.org/web/20130808031902/http://instant-g.com/Products/36Conversion/VRAM.html |title=VarioRAM Explained |date=8 August 2013}}</ref><ref>{{cite web |url=http://www.instant-g.com/products/36conversions/3-6-engine-information/varioram |website=instant-g.com |title=How and why a VarioRAM works |access-date=2018-08-01}}</ref><ref>{{cite web |url=https://www.total911.com/technology-explained-varioram/ |website=total911.com |title=Technology explained: VarioRam |access-date=2018-08-01}}</ref><ref>{{cite web |url=http://autoweek.com/article/autoweek-60/october-1995-new-targa-varioram-and-more-join-911-lineup |website=autoweek.com |title=October 1995: A new Targa, Varioram and more join the 911 lineup |access-date=2018-08-01}}</ref>
 
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 [[Physics:Torque|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.<ref>{{webarchive |url=https://web.archive.org/web/20130808031902/http://instant-g.com/Products/36Conversion/VRAM.html |title=VarioRAM Explained |date=8 August 2013}}</ref><ref>{{cite web |url=https://www.instant-g.com/products/36-conversions/36-engine-information/varioram-explained/ |website=instant-g.com |title=How and why a VarioRAM works |access-date=2018-08-01}}</ref><ref>{{cite web |url=https://www.total911.com/technology-explained-varioram/ |archive-url=https://web.archive.org/web/20141112062027/http://www.total911.com/technology-explained-varioram/ |url-status=dead |archive-date=November 12, 2014 |website=total911.com |title=Technology explained: VarioRam |access-date=2018-08-01}}</ref><ref>{{cite web |url=https://www.autoweek.com/car-life/a1702991/october-1995-new-targa-varioram-and-more-join-911-lineup/ |first=Andy |last=Stoy |website=autoweek.com |title=October 1995: A new Targa, Varioram and more join the 911 lineup |date=30 October 1995 |access-date=2018-08-01}}</ref>


==References==
==References==
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{{reflist|colwidth=30em}}


{{Porsche vehicles|state=collapsed}}
[[Category:Engine technology]]




[[Category:Engine technology]]


{{Sourceattribution|VarioRam}}
{{Sourceattribution|VarioRam}}

Latest revision as of 15:52, 2 April 2025

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

  1. ↑
  2. ↑ "How and why a VarioRAM works". https://www.instant-g.com/products/36-conversions/36-engine-information/varioram-explained/. 
  3. ↑ "Technology explained: VarioRam". https://www.total911.com/technology-explained-varioram/. 
  4. ↑ Stoy, Andy (30 October 1995). "October 1995: A new Targa, Varioram and more join the 911 lineup". https://www.autoweek.com/car-life/a1702991/october-1995-new-targa-varioram-and-more-join-911-lineup/. 




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