Hybrid How-To No 16: Building the LS/VTEC engine
A close-up look at the valvetrain reveals Honda's famed VTEC setup. The VTEC rocker arm in the center just floats there at low rpm. At high rpm, a pin connects it to the two outer arms, which actually open the valves. Since the center cam lobe opens earlier, opens farther, and closes later, the low-rpm arms are lifted off the low-rpm lobes and the valves follow the big center lobe.
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