system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
What is VTEC?


assistant
VTEC stands for "Variable Valve Timing & Lift Electronic Control." It is a technology used by some Honda cars for changing the way an engine runs based on the engine speeds. It works   by using oil pressure to activate a different camshaft profile at higher engine speeds. The camshaft profile allows more air to enter the engine cylinders, and thus causes more effective combustion and more power. At lower engine speeds, VTEC disengages and uses a default camshaft profile, which is optimized for fuel efficiency.