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Old 08-14-2013, 08:23 PM   #1 (permalink)
jeff88
Lots of Questions
 
Join Date: Jan 2013
Location: San Jose
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How Toyota's Valvematic Works

Been researching Toyota engines recently and my research has found that Toyota has developed a technology called Valvematic, which changes the lift amount based on load.

Because it controls lift, it does not require a throttle plate (which helps reduce pumping losses), but I am of two minds here. Yes the removal of the throttle plate reduces pumping losses, but wouldn't the intake valves just act like the throttle plate, in that they stop/slow air flow, making the pumping losses the same?

Can anybody give me insight into how the system works? What actually makes it open more or less?

Are there any other makes that employ similar technology?

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