Quote:
Originally Posted by TOYMARO
Well now. We all know that NO headers or manifold will torch valves. That aside. I always thought, maybe incorrectly, that headers actually created a small vacuum affect with the exhaust. Actually "pulling" fumes thru the header from ex port to collector. Hence short tube vs long tube. Long being an upgrade and shorties doing about nothing.
I though you could even "tune" headers by increasing or decreasing the tube length. Anyone??
If true, then headers are better than no manifold (from a restriction standpoint).
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You are correct. Negative pressure is what does the "pulling" effect. It is further encompassed by the scavenging affect in the collector. The smoother the "pull" if you will, the more efficient the airflow. I could go into a very in depth explanation of why we can have drone, the advantages of X-pipes, etc but I'll settle with telling you that you are very correct and that Spartan01 is completely inaccurate in about everything he types.
