I’ve been thinking about experimenting with this for some time now and for some reason it’s really piqued my interest again!
I have a torque hole at around 2.1-2.5k rpm range - which I’ve mostly dialled out with tuning the carbs / needle experiments - but it correlates with exhaust drone / resonance. It’s not the sort of unbearable drone but it’s definitely a resonance that I know is there.
So I’m tempted to experiment with a J pipe or a resonator cavity. At present it’s just a thought experiment and learning, so nothing I plan to do right away,
Given a 120hz centreline of the target frequencies, it’s looking like a c. 86cm pipe which I can fit in one of 3 locations on the car, but a Helmholtz cavity would be much more compact if one can calculate it accurately with the myriad of variables in the equations.
There are tonnes of internet resources on the topic but out of curiosity, has anyone done this on a Z / L6 engine that we know of?
I have a torque hole at around 2.1-2.5k rpm range - which I’ve mostly dialled out with tuning the carbs / needle experiments - but it correlates with exhaust drone / resonance. It’s not the sort of unbearable drone but it’s definitely a resonance that I know is there.
So I’m tempted to experiment with a J pipe or a resonator cavity. At present it’s just a thought experiment and learning, so nothing I plan to do right away,
Given a 120hz centreline of the target frequencies, it’s looking like a c. 86cm pipe which I can fit in one of 3 locations on the car, but a Helmholtz cavity would be much more compact if one can calculate it accurately with the myriad of variables in the equations.
There are tonnes of internet resources on the topic but out of curiosity, has anyone done this on a Z / L6 engine that we know of?