WEBVTT - What does the VTEC system do?

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<v Speaker 1>Protect your photos, music and documents and access to them

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<v Speaker 1>today at m o z y dot com. Welcome to

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<v Speaker 1>brain Stuff from how Stuff Works dot com where smart happens. Hi,

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<v Speaker 1>I'm Marshall Brain with today's question, what does the v

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<v Speaker 1>tech system and a Honda engine do? Every gasoline engine

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<v Speaker 1>has valves that let air into the engine and let

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<v Speaker 1>exhaust out of the engine. A camshaft controls those valves.

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<v Speaker 1>The camshaft uses rotating lobes that push against the valves

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<v Speaker 1>to open and close them. It turns out that there

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<v Speaker 1>is a significant relationship between the way the lobes are

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<v Speaker 1>ground on the camshaft and the way the engine performs

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<v Speaker 1>at different speed. For maximum engine performance at low engine speeds,

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<v Speaker 1>the valves need to open and close differently than they

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<v Speaker 1>do at high engine speeds. If you put in a

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<v Speaker 1>good low speed camshaft, it hurts the engines performance at

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<v Speaker 1>high speeds, and if you put in a good high

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<v Speaker 1>speed camshaft, it hurts the engines performance at low speeds.

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<v Speaker 1>And in extreme cases, can make it very hard to

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<v Speaker 1>start the engine. V TECH, which stands for variable valve

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<v Speaker 1>Timing and Lift Electronic Control, is an electronic and mechanical

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<v Speaker 1>system in some Honda engines that allows the engine to

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<v Speaker 1>effectively have multiple camshafts. As the engine moves into different

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<v Speaker 1>RPM ranges, the engine's computer can activate alternate lobes on

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<v Speaker 1>the camshaft and change the cams timing. In this way,

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<v Speaker 1>the engine gets the best features of a low speed

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<v Speaker 1>and high speed camshaft in the same engine. Several engine

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<v Speaker 1>manufacturers are experimenting with system that would allow infinite variability

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<v Speaker 1>in valve timing. For example, imagine that each valve had

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<v Speaker 1>a big sole annoid on it that could open and

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<v Speaker 1>close the valve under computer control, rather than relying on

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<v Speaker 1>a camshaft. With this type of system, you would get

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<v Speaker 1>maximum engine performance at every RPM range. Something to look

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<v Speaker 1>forward to in the future For more on this and

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<v Speaker 1>thousands of other topics. Because it how stuff works, dot Com,

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