QUOTE(K3nnYkl82 @ Feb 16 2012, 02:11 PM)
those are not call VVT ..
vvt stands for variable valve timing ... it actually advance the valve open or retard the valve open ..
VTEC, MIVEC (The older days MIVEC, not the current Lancer one) .. CPS ..
those are call LIFT ... the technology is totally different.. it has a 2ndary cam loop .. when it engage.. the valve will open base on the 2ndary loop. its like changing cam instantly .. normally these cam (2nd cam) have higher loops .. means the valve open DEEPER .. allow more air to go in .. it does not have the capability to change the timing instantly .. but it will base on the timing on the 2nd cam ..
if u know about HIGH cams.... bad for idling .. got for high end power ... VTEC, OLD MIVEC, CPS .. is like the engine will switch instantly to the 2ndary HIGH Cam at certain RPM .. tahts why u hear ppl says VTEC KICK IN ..
summarize .. VVT --> more to fuel saving
LIFT --> more to powar ...
Emm sorry I'll have to call you out on that.
VTEC and MIVEC are both variable valve timing systems, not valve lift.
http://en.wikipedia.org/wiki/VTEChttp://en.wikipedia.org/wiki/MIVECThe first paragraph of each article pretty much sums it all up.
You're are right about CPS is variable valve lift.
Added on February 16, 2012, 2:20 pmAnyway, from my research:
Early VVT systems are cam-switching systems, which means the engine will switch to different cams with different cam lobes based on a preset RPM.
New VVT are continuous, either through cam-phasing or adjusting the cam belt tension or some other obscured method. The point is it will continuously adjust the valve timing instead of switching cams are preset RPMs.
Just sharing, correct me if I am wrong
This post has been edited by dares: Feb 16 2012, 02:20 PM