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Old 01-18-2005, 09:07 AM   #1
CivicRida
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Default What is VTEC?

Original Article Text by: Prowler
Updates/Editting/Formatting by: 94accordex

Very simply put, VTEC is either the intake and/or exhaust valves being opened up longer to allow more power at higher RPMs. There are various types, including:
  • Standard SOHC VTEC, which is found on D, F, and J-series motors and only has a VTEC lobe for the intake side of the motor; single cam VTEC provides a balance between performance and good fuel economy
  • Standard DOHC VTEC, which is found on B and D-series motors and has VTEC camshaft profiles for both the intake and the exhaust sides of the motor; dual cam VTEC provides a significant power increase over single cam VTEC, but at the cost of slightly reduced fuel economy
  • i-VTEC, which governs when the VTEC engaged based on different sensor readings as opposed to a set RPM output; this is the most advanced form of VTEC, and is only found on K-series motors
  • VTEC-e, which is found in the Civic VX and HX models and is mainly a fuel efficiency feature rather than a performance-enhancing measure

For more detailed explanations, please refer to the following sources:

http://auto.howstuffworks.com/question229.htm
http://www.honda-marine.com/video/VTEC.wmv
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Last edited by 94accordex; 12-14-2007 at 12:59 AM. Reason: Added additional formatting, added additional text, added an additional link
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