Similarly found on Ferd Tarus SHO motors (Yamaha motor)...
_______________________
Jon Smith--Raleigh, NC
jon@fast4x4.net
www.fast4x4.net
> FWIW, I found the following on a Honda oriented site which refers to a
butterfly
> valve that opens in the intake to decrease its intake runner length at
higher rpms...
>
> VTEC = Variable Timing Electronic Control...it is an electronic hydraulic
actuator on
> DOHC honda 4 cylinder engine that varies cam profile and intake runner
distance by
> opening secondary butterfly valves above 5500 RPMs to decrease runner path
length.
>
>
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