WEBVTT - How do exhaust headers work to improve an engine's performance?

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<v Speaker 1>to brain Stuff from how stuff works dot com where

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<v Speaker 1>smart happens. Hi Am Marshall Brain with today's question, how

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<v Speaker 1>do exhaust headers work to improve engine performance? Headers are

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<v Speaker 1>one of the easiest bolton accessories you can use to

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<v Speaker 1>improve an engine's performance. The goal of headers is to

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<v Speaker 1>make it easier for the engine to push exhaust gases

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<v Speaker 1>out of the cylinders during the exhaust stroke. A good

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<v Speaker 1>way for an engine to lose power is through back pressure.

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<v Speaker 1>The exhaust valve opens at the beginning of the exhaust stroke,

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<v Speaker 1>and then the piston pushes the exhaust gases out of

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<v Speaker 1>the cylinder. If there's any out of resistance that the

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<v Speaker 1>piston has to push against to force the gases out,

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<v Speaker 1>power is wasted. In a normal engine. Once the exhaust

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<v Speaker 1>gases exit the cylinder, they end up in the exhaust manifold.

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<v Speaker 1>In a four cylinder engine, there are four cylinders using

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<v Speaker 1>that same manifold. From the manifold, the exhaust gases flow

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<v Speaker 1>into one pipe towards the catalytic converter and the muffler.

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<v Speaker 1>It turns out that the manifold can be an important

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<v Speaker 1>source of back pressure because exhaust gases from one cylinder

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<v Speaker 1>build up pressure in the manifold that affects the next

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<v Speaker 1>cylinder that uses that manifold. The idea behind an exhaust

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<v Speaker 1>header is to eliminate the manifolds back pressure. Instead of

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<v Speaker 1>a common manifold that all of the cylinders share, each

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<v Speaker 1>cylinder gets its own exhaust pipe. These pipes come together

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<v Speaker 1>into a larger pipe called the collector. The individual pipes

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<v Speaker 1>are cut and bent so that each one is the

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<v Speaker 1>same length as all the others. By making them the

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<v Speaker 1>same length, it guarantees that each cylinder's exhaust gases arrive

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<v Speaker 1>in the collector spaced out equally, so there's no back

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<v Speaker 1>pressure generated by cylinders sharing the collector. This causes the

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<v Speaker 1>least amount of back pressure and gives headers a performance boost.

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