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Speaker 1: to brain Stuff from how stuff works dot com where
Speaker 1: smart happens. Hi Am Marshall Brain with today's question, how
Speaker 1: do exhaust headers work to improve engine performance? Headers are
Speaker 1: one of the easiest bolton accessories you can use to
Speaker 1: improve an engine's performance. The goal of headers is to
Speaker 1: make it easier for the engine to push exhaust gases
Speaker 1: out of the cylinders during the exhaust stroke. A good
Speaker 1: way for an engine to lose power is through back pressure.
Speaker 1: The exhaust valve opens at the beginning of the exhaust stroke,
Speaker 1: and then the piston pushes the exhaust gases out of
Speaker 1: the cylinder. If there's any out of resistance that the
Speaker 1: piston has to push against to force the gases out,
Speaker 1: power is wasted. In a normal engine. Once the exhaust
Speaker 1: gases exit the cylinder, they end up in the exhaust manifold.
Speaker 1: In a four cylinder engine, there are four cylinders using
Speaker 1: that same manifold. From the manifold, the exhaust gases flow
Speaker 1: into one pipe towards the catalytic converter and the muffler.
Speaker 1: It turns out that the manifold can be an important
Speaker 1: source of back pressure because exhaust gases from one cylinder
Speaker 1: build up pressure in the manifold that affects the next
Speaker 1: cylinder that uses that manifold. The idea behind an exhaust
Speaker 1: header is to eliminate the manifolds back pressure. Instead of
Speaker 1: a common manifold that all of the cylinders share, each
Speaker 1: cylinder gets its own exhaust pipe. These pipes come together
Speaker 1: into a larger pipe called the collector. The individual pipes
Speaker 1: are cut and bent so that each one is the
Speaker 1: same length as all the others. By making them the
Speaker 1: same length, it guarantees that each cylinder's exhaust gases arrive
Speaker 1: in the collector spaced out equally, so there's no back
Speaker 1: pressure generated by cylinders sharing the collector. This causes the
Speaker 1: least amount of back pressure and gives headers a performance boost.
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