Quote:
Originally Posted by 83gs1100g
so maybe for the civic vx the vtec rpm switchover is just to limit running in 12v mode and forces it to 16v mode?
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Yes. Under ~2500rpm vtec is NOT engaged, the engine is running using 12 valves. Engaging vtec just engages one additional valve per cylinder for a total of 16 valves.
If you can find a Honda factory service manual online, it contains a in-depth description of vtec-e.
ZO.