DVVT is the Daihatsu Variable Valve Timing. It also samiliar to the VTEC from Honda (Variable valve Timing and Electronic lift Control) and Mitsubishi MIVEC (Mitsubishi Innovative Valve-timing-and-lift Electronic Control system) VVT-i (Variable Valve Timing intelligence) for Toyota...
This all system will push the valve to open more at the certain RPM... example: VTEC system will open when 3500RPM (early opening for VTEC). This situation, the fuel+air mixture from the inlet to the combustion chamber will increase... so the Volume Metric Efficiency will also increase.. = More POWER + TORQUE... The piston will go faster down (to the Bottom Dead Center) when the compression in the combustion chamber high (example more explosive in u'r room more pressure to push you out..).
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