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Speaker 1: today at m o z y dot com. Welcome to
Speaker 1: brain Stuff from how Stuff Works dot com where smart happens. Hi,
Speaker 1: I'm Marshall Brain with today's question, what does the v
Speaker 1: tech system and a Honda engine do? Every gasoline engine
Speaker 1: has valves that let air into the engine and let
Speaker 1: exhaust out of the engine. A camshaft controls those valves.
Speaker 1: The camshaft uses rotating lobes that push against the valves
Speaker 1: to open and close them. It turns out that there
Speaker 1: is a significant relationship between the way the lobes are
Speaker 1: ground on the camshaft and the way the engine performs
Speaker 1: at different speed. For maximum engine performance at low engine speeds,
Speaker 1: the valves need to open and close differently than they
Speaker 1: do at high engine speeds. If you put in a
Speaker 1: good low speed camshaft, it hurts the engines performance at
Speaker 1: high speeds, and if you put in a good high
Speaker 1: speed camshaft, it hurts the engines performance at low speeds.
Speaker 1: And in extreme cases, can make it very hard to
Speaker 1: start the engine. V TECH, which stands for variable valve
Speaker 1: Timing and Lift Electronic Control, is an electronic and mechanical
Speaker 1: system in some Honda engines that allows the engine to
Speaker 1: effectively have multiple camshafts. As the engine moves into different
Speaker 1: RPM ranges, the engine's computer can activate alternate lobes on
Speaker 1: the camshaft and change the cams timing. In this way,
Speaker 1: the engine gets the best features of a low speed
Speaker 1: and high speed camshaft in the same engine. Several engine
Speaker 1: manufacturers are experimenting with system that would allow infinite variability
Speaker 1: in valve timing. For example, imagine that each valve had
Speaker 1: a big sole annoid on it that could open and
Speaker 1: close the valve under computer control, rather than relying on
Speaker 1: a camshaft. With this type of system, you would get
Speaker 1: maximum engine performance at every RPM range. Something to look
Speaker 1: forward to in the future For more on this and
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