Quote:
Originally Posted by KJSatz
What our R18 does is partially retract some of the charge so that less of the mixture is used. I think it's pretty clear in the second link in my first reply here. Also, calling it VTEC would be incorrect. If you are in a lower load situation from 1000 to 3500RPM, you will probably be in VTEC, but you won't be in this weird thing unless you're in especially low load. At least that is the way I understand it; if they are activated only with each other, I am mistaken.
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Reading through your first link above, I think the techniques for reducing pumping losses are part of i-VTEC.
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With the R18A SOHC i-VTEC mechanism, Honda's R&D engineers introduced the idea of controlling the amount of air entering the combustion chamber via other means instead of the throttle butterfly. This is done via a combination of both valve timing and an exploitation of the property of the 4-stroke cycle and a new Drive By Wire (DBW) system.
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