![]() On the 3.7-liter engine, the transition to high-speed mode occurs at 4,700 rpm, where intake valve lift increases 28-percent and exhaust valve lift increases 10-percent. As the revs rise, pressurized oil (controlled by the PCM) activates small pistons that locks the exhaust valve rocker to a corresponding high-speed rocker arm, which then follows a single high-lift, long-duration cam lobe. Both exhaust valves follow a single low-lift, short-duration cam profile at low engine rpm. ![]() ![]() The big 3.7-liter engine has the same VTEC® intake valve control system as the 3.5-liter engine, but adds a unique new multi-arm VTEC® rocker arm system for the exhaust valves. ![]() Click to expand.Wow, the new TL is getting (from factory) better shifter bushings, stiffer mounts, 58/42 weight balance, 110lbs lighter then auto, dual mass clutch (yes not flywheel)
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