Car Talk (split from "Are you a geek?" thread)

[StinkyMojo]

Originally Posted by Aemon_

its basically variable valve timing. when you reach a certain RPM (imports will rev to the moon and back) then the compter tells the cams to shift- the cams on vtec engine have double the lobes, the double set is higher- so the shift moves the higher lobes into place, rasing the valves a little higher, therefore rasing perfomance at higher rpms.

my explanation.

later

the the best short explanation I've heard