Make a trombone like slide pipe to tune the resonator.. don't make a link pipe rather connect a bend to the end of the resonator pipe.. the resonator pipe connection/junction want to be the same dia as the exhaust pipe.. it creates a pressure drop negative pulse that can halve the positive pressure wave traveling on to the tail pipe.. the resonator end creates a reversed pulse back to the junction.. somewhat half way between the pulse that created it.. & the next pulse travelling to the tail pipe.. BUT.. the key in tuning it.. is a critical magic point at which negative waves bouncing back from the resonator to the exhaust.. help suck/neutralise part of the next pressure wave upstream from the junction.. make a trombone joint by taping sellotape to the resonator pipe & sealing the slide pipe with vht gasket goo.. the tape will burn off in the first run the the sealer will be able to slip but still have a good pressure seal.. ANY leak will interfere with the pressure/vacuum pulses & the tune.
Great stuff...! I have no on-hand experience with J-pipes (a.k.a. 1/4 wave resonators), but Helmholtz resonators have served me well...! I've seen 1/4 wave resonators work well on exhaust systems, but Helmholtz style resonators do seem to cover a wider range of frequencies and they offer greater damping and frequency attenuation....
Make a trombone like slide pipe to tune the resonator.. don't make a link pipe rather connect a bend to the end of the resonator pipe.. the resonator pipe connection/junction want to be the same dia as the exhaust pipe.. it creates a pressure drop negative pulse that can halve the positive pressure wave traveling on to the tail pipe.. the resonator end creates a reversed pulse back to the junction.. somewhat half way between the pulse that created it.. & the next pulse travelling to the tail pipe.. BUT.. the key in tuning it.. is a critical magic point at which negative waves bouncing back from the resonator to the exhaust.. help suck/neutralise part of the next pressure wave upstream from the junction.. make a trombone joint by taping sellotape to the resonator pipe & sealing the slide pipe with vht gasket goo.. the tape will burn off in the first run the the sealer will be able to slip but still have a good pressure seal.. ANY leak will interfere with the pressure/vacuum pulses & the tune.
Great stuff...!
I have no on-hand experience with J-pipes (a.k.a. 1/4 wave resonators), but Helmholtz resonators have served me well...!
I've seen 1/4 wave resonators work well on exhaust systems, but Helmholtz style resonators do seem to cover a wider range of frequencies and they offer greater damping and frequency attenuation....
Phase is an issue with Helmholtz? eg it needs to be worried about?
@@DriveTuneMedia no. Helmholtz-style resonators aren't concerned with that because they work differently from J-pipes (1/4 wave resonators).