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    How do exhaust headers work to improve engine performance

    Rick Ears

    Posts : 145
    Join date : 2009-02-25

    How do exhaust headers work to improve engine performance

    Post  Rick Ears on Sun Mar 01, 2009 4:08 pm

    Headers are one of the easiest bolt-on accessories you can use to improve an engines performance. The goal of headers is to make it easier for the engine to push exhaust gases out of the cylinders

    The gasin the cylinder burns and expands during this stroke, generating power.
    The other three strokes are necessary evils required to make the power
    stroke possible. If these three strokes consume power, they are a drain
    on the engine.

    During the exhaust stroke, a good way for an engine to lose power is through back pressure.
    The exhaust valve opens at the beginning of the exhaust stroke, and
    then the piston pushes the exhaust gases out of the cylinder. If there
    is any amount of resistance that the piston has to push against to
    force the exhaust gases out, power is wasted. Using two exhaust valves
    rather than one improves the flow by making the hole that the exhaust
    gases travel through larger.In a normal engine, once the exhaust gases exit the cylinder they end up in the exhaust manifold.
    In a four-cylinder or eight-cylinder engine, there are four cylinders
    using the same manifold. From the manifold, the exhaust gases flow into
    one pipe toward the catalytic converter and the muffler.
    It turns out that the manifold can be an important source of back
    pressure because exhaust gases from one cylinder build up pressure in
    the manifold that affects the next cylinder that uses the manifold.

    The idea behind an exhaust header is to eliminate
    the manifold's back pressure. Instead of a common manifold that all of
    the cylinders share, each cylinder gets its own exhaust pipe. These
    pipes come together in a larger pipe called the collector.
    The individual pipes are cut and bent so that each one is the same
    length as the others. By making them the same length, it guarantees
    that each cylinder's exhaust gases arrive in the collector spaced out
    equally so there is no back pressure generated by the cylinders sharing
    the collector.

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