the exhaust cam phasing on the vq37 is not variable. The intake cam phasing is variable around +- 40 degrees. The valve lift and duration are increased and decreased by a single motor on the back of each head (it is a servo motor with magnetic feedback not a stepper). They are both increased together as a lever that looks like half a cam lobes swings up and down pushing the valve open, the further the lever swings (controlled by the motor on the back of the head) the farther the valve opens and the more time it takes to swing that lever farther means duration goes up as lift goes up.
Edit: also vtec cannot continuously vary the lift like vvel, with vtec you have high lift and low lift anywhere above a certain rpm you are using the high lift cam lobe anywhere below that rpm you are using the low lift cam lobe. vvel allows the computer to adjust te lift for the perfect balance of power and torque at any rpm.
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Last edited by 1slow370; 11-19-2010 at 03:09 AM.
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