12360
Dodge Dakota
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6/22/2002
19:48:05
|  RE: http://www.sa-motorsports.com/diyport.ht
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Message:
performance-enhancing modifications besides port-matching manifolds include 1) removing the "steps" at the transition between the valve seat and the combustion chamber and at the transition between the valve seat and bowl, 2) smoothing the transition between the exhaust bowl and runner, and 3) polishing the exhaust bowl and runner. A cautionary note is in order: modifications to the port configuration will not necessarily result in performance gains. Unless the home-porter has access to a flow bench for evaluation of modifications, attempts to extensively modify the port configuration should be avoided. Instead, simple line-of-sight smoothing and removal of gross obstructions to flow should be the objective. Keep in mind the direction of gas flow and consider inertia of the flowing gas as cuts are planned. That said, for intake ports, bigger is generally better.
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Subject: http://www.sa-motorsports.com/diyport.ht