ThunderCoupe
Registered User
When an exhaust valve opens, a sudden charge of pressured air escapes into the manifold and hits the collector, but since all three valves on a manifold bank do not open at the same time, this pressure charge not only moves down the collector towards the exit of hte exhaust, but also back up the other two primaries of the manifold?
This is due to the fact that pressure flow follows the path of least resistance, and since the other valves are closed, their primaries have less pressure in them than the exhaust the rest of the way back?
The idea between tuning the design of headers is to time it so that this pulse is moving back away from the valves of the other two at their points of opening to help scavenge exhaust gases?
If we introduce increased restriction in the exhaust, then the amplitude of this pulse is greater, and the width could also be longer?
are all of these assumptions correct?
This is due to the fact that pressure flow follows the path of least resistance, and since the other valves are closed, their primaries have less pressure in them than the exhaust the rest of the way back?
The idea between tuning the design of headers is to time it so that this pulse is moving back away from the valves of the other two at their points of opening to help scavenge exhaust gases?
If we introduce increased restriction in the exhaust, then the amplitude of this pulse is greater, and the width could also be longer?
are all of these assumptions correct?