HelmHoltz resonator - No more drone !

[ARH1956]

Found below is a chart I used in determining how long to build my resonator tube. It was compiled by someone running a GM 6.2L V-8 in a GTO. I used a 2.5"x26" tube to eliminate drone with my Raptor @ slightly below 2K rpm.

RPM / Tube length (in), all with 2.5" tubing

1500/ 33.75"
1550/ 32.66"
1600/ 31.64"
1650/ 30.68"
1700/ 29.77"
1750/ 28.93"
1800/ 28.12"
1850/ 27.36"
1900/ 26.64"
1950/ 25.96"
2000/ 25.31"

 

[JJ f150harley]

Is everyone installing these after the muffler and pointed forward?

 

[Jimbo]

Mine will be before The muffler pointed forward.

 

[JJ f150harley]

Does it make a difference if its before or after? Where cuts the drone the most?

 

[Jimbo]

Does it make a difference if its before or after? Where cuts the drone the most?

Not sure. I've always seen them in front.

 

[JJ f150harley]

Not sure. I've always seen them in front.

Thanks Jimbo for the help!

 

[970Co]

@dirtydeeds ..... mine is after the muffler and pointed forward

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[ARH1956]

Is everyone installing these after the muffler and pointed forward?

Mine is before the muffler, coming out about where the factory resonator was located, pointed backwards. It doesn't seem to matter how it is oriented: forward, backwards, straight, curved, etc.

 

[JJ f150harley]

970 and ARH thank you!

 

[Fb73]

Mine is before the muffler, coming out about where the factory resonator was located, pointed backwards. It doesn't seem to matter how it is oriented: forward, backwards, straight, curved, etc.

Same setup ! Works good...cheap job, the welder charged me 80$