bill shoe wrote:It was invented by Helmholtz.
Helmholtz is a name used for a variety of tuners that probably go beyond strictly helmholtz types, so if you research more it can get confusing. "Helmholtz" is almost interchangable with "wave tuner" in the way "Kleenex" is interchangable with "tissue".
Helmholtz tuners are generally designed to cancel a frequency in the tube or device it is attached to. Typical example is cancelling a loud resonant wave that occurs in an intake manifold at a certain frequency (rpm).
hardingfv32 wrote:Don't we want high wave resonance for maximum exhaust scavenging?
I am not sure the longevity of the exhaust system is that big an issue. I would say thermal shock and engine vibration would be the bigger issues. They are .025 wall Inconel. My set is marked 1850 km.
aussiegman wrote:The Kadenacy effect is an effect that forms from pressure-waves in gases. For an IC engine, it is when the the momentum of the exhaust gases exiting the cylinder creates an internal pressure-drop within the cylinder, assisting cylinder filling during the intake event. This can be maximised by the tuning of intake and exhaust manifolds to coincide with the pulse wave reversion of through tuned length tubes (exhaust headers or intake runners) to assist in scavenging and increase the pressure drop across the intake and exhaust valve area within a specific RPM range.
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