what is i vtec engine


VTEC - Wikipedia, the free encyclopedia

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** VTEC **

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For other uses, see VTEC (disambiguation).

*VTEC* (*Variable Valve Timing and Lift Electronic Control*) is a system
developed by Honda to improve the volumetric efficiency of a four-stroke
internal combustion engine (i.e. improved economy). The VTEC system uses
two camshaft profiles and hydraulically selects between profiles. It was
invented by Honda engineer Ikuo Kajitani,^[1]^[2] and was the first system
of its kind.^[/citation needed/] It is distinctly different from standard
VVT (variable valve timing) which advances the valve timing only and does
not change the camshaft profile or valve lift in any way.

Vtec.svg

*Contents*

· 1 Context, and description
· 2 History

· 2.1 DOHC VTEC
· 2.2 SOHC VTEC

· 3 VTEC-E
· 4 3-Stage VTEC
· 5 i-VTEC

· 5.1 K-series
· 5.2 R-series
· 5.3 i-VTEC with Variable Cylinder Management (VCM)
· 5.4 i-VTEC i

· 6 AVTEC
· 7 VTEC TURBO
· 8 VTEC in motorcycles
· 9 References
· 10 External links

*Context, and description[edit]*

Japan levies a tax based on engine displacement,^[3] and Japanese auto
manufacturers have correspondingly focused their research and development
efforts toward improving the performance of their smaller engine designs
through means other than displacement increases. One method for increasing
performance into a static displacement includes forced induction, as with
models such as the Toyota Supra and Nissan 300ZX which used turbocharger
applications and the Toyota MR2 which used a supercharger for some model
years. Another approach is the rotary engine used in the Mazda RX-7 and
RX-8. A third option is to change the cam timing profile, of which Honda
VTEC was the first successful commercial design for altering the


Source: en.wikipedia.org/wiki/VTEC

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