Anyone try or know anything about Helmholtz resonators. I heard they can give power and dampen sound a little. Seems like something the Duke can especially use. Where would they be connected? Apparently they can be tuned to resonate at particular frequencies..say at cruising RPM etc.

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84 Duke, Holley TBI, Manual Trans 4.10, CompuCam, White

They don't do anything for power and use sound cancellation to reduce cruise rpm drone common with 3" or larger exhausts.

the hard part is finding room to route a 26"+ section of pipe for the resonator.

I need to measure, but I think there is 26"+ of pipe on the passenger outlet of my magnaflow muffler. If there is I could install an electric cutout on that pipe and reduce the cruise rpm drone. Or just cut the trunk and install the vibrant performance ultra quiet resonator (used it on my last swap with a very similar exhaust setup) and it was drone free.

Helmholtz resonators are also used to cancel out intake noise.

You *CAN* design an intake plenum and ram-tube to operate as a Helmholtz resonator if you have 4 or fewer cylinders pulling from the plenum. It can boost torque at one RPM point, but will ALWAYS reduce torque at another RPM point.

quote Originally posted by Will: Helmholtz resonators are also used to cancel out intake noise. You *CAN* design an intake plenum and ram-tube to operate as a Helmholtz resonator if you have 4 or fewer cylinders pulling from the plenum. It can boost torque at one RPM point, but will ALWAYS reduce torque at another RPM point.

oh... Thanks Will!

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84 Duke, Holley TBI, Manual Trans 4.10, CompuCam, White

You can probably find a photo of an exhaust helmholtz chamber if you look at photos of 350Z exhaust systems.

The Mazda K series V6's use a helmholtz intake manifold with 3 different chambers that it switches between.