Header design can have an effect upon both. If properly designed, the header set will provide a beneficial pressure balance between the intake and the exhaust.Īn engine benefits from two different types of scavenging: Inertial scavenging and wave scavenging. Simultaneously, those waves of exhaust help the intake side by pulling in a fresh air-fuel charge. Inside a header (with the engine running), “waves” of exhaust passing through the tubing are more or less manipulated to extract the burned gases from the combustion chamber. To answer to your questions, we went straight to two well-respected expert organizations in the biz- Hooker Headersand Reher-Morrison Racing Engines-for the lowdown on headers. We tend to agree with the latter, but when it comes to the racing world, one thing is pretty clear:Įxperience and knowledge are absolutely paramount. Some folks will tell you none of this matters.
We regularly field questions regarding headers.Ĭommon header questions are centered around tube diameter, tube length, collector diameter, collector length, and so on.
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