CK5
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miserable droning between 70 and 80mph... Adding a side branch resonator.
- Thread starter muddysub
- Start date
I wonder if a resonator would help reduce the drone?
Just had another thought. You put that bed/platform back there. Have you also double checked that none of that is resonating? You basically built a big port/horn and may be hitting a resonance point now.
Josh
Josh
It was quiet with the platform before we changed the ring & pinions. And I'd think that a couple hundred pounds of **** on top of the platform should deaden any sound coming from it. I'm gonna do better sound dampening in the back and the exhaust work and see how it works.
Ya its popular with the Camaro guys using the noise canceling chamber. They refer to them as "J Pipes". I bought a set to put on mine but just never got to it before I sold it. With the exhaust I put on it it would drone pretty bad from 1700-2000 rpm. I tried Dynamat in the trunk and it didn't really do much. But hey if anyone wants some 2.5" stainless J bends let me know 
The 45* bend showed up yesterday, I just need to cap off the end and it's ready to be installed. I've got the position marked on the exhaust under the truck, I'll have to remove it or at least drop it down to weld this thing in.
Didn't see you mention anything on this, but those pipes are 'tuned'. The length make a difference in where it resonates, so you want the right resonance point to offset the drone.
Josh
Josh
Post 5 in this thread
y5mgisi
1 ton status
Sure curious to see of this helps you out at all.
Man....I'd be tempted to "sleeve" a capped section of tubing over the end of that new "J" pipe so that you could slide it in or out a few inches (like a trombone!).....
Do a few road tests.... move and tack weld the sleeve an inch or two.... retest and evaluate. Once you were 100% satisfied with the tuning, do a perimeter weld around that adjustable sleeve and call it a day.
-G
Do a few road tests.... move and tack weld the sleeve an inch or two.... retest and evaluate. Once you were 100% satisfied with the tuning, do a perimeter weld around that adjustable sleeve and call it a day.
-G
Man....I'd be tempted to "sleeve" a capped section of tubing over the end of that new "J" pipe so that you could slide it in or out a few inches (like a trombone!).....
Do a few road tests.... move and tack weld the sleeve an inch or two.... retest and evaluate. Once you were 100% satisfied with the tuning, do a perimeter weld around that adjustable sleeve and call it a day.
-G
^^^This
I don't understand this so I'll stand back here and hold the light.
I don't understand this so I'll stand back here and hold the light.
I would kill for a person like you around...a light holding wrench hander guy is focking awesome to have around.
I meant to post up on this the other night when I first read it...
this is pretty common practice/tech in boat building.. well, some anyway.. mostly sportfish type setups like we build at our factory...
as you can imagine, a pair of BIG dizzles in a fiberglass boat with fiberglass mufflers, might have a tendency to drone.. even with water running thru it...
I call em resonator tubes..... if I get down to the factory in the next week or so, I'll try to snap a few pics..
this is pretty common practice/tech in boat building.. well, some anyway.. mostly sportfish type setups like we build at our factory...
as you can imagine, a pair of BIG dizzles in a fiberglass boat with fiberglass mufflers, might have a tendency to drone..
even with water running thru it...I call em resonator tubes..... if I get down to the factory in the next week or so, I'll try to snap a few pics..
Man....I'd be tempted to "sleeve" a capped section of tubing over the end of that new "J" pipe so that you could slide it in or out a few inches (like a trombone!).....
Do a few road tests.... move and tack weld the sleeve an inch or two.... retest and evaluate. Once you were 100% satisfied with the tuning, do a perimeter weld around that adjustable sleeve and call it a day.
-G
Hmm, good idea. I need to see if I can find some 2.5" OD tube to slide into the 2.5" ID stuff I've got.
Interesting. Are these just welded to the pipe or connected into the system?
I've got to cut a hole in the existing pipe and weld this onto it
No it gets capped. It's a dead chamber. The sound waves go there to die and it cancels out the offending waves. You ever seen an intake setup on a newer car? They have little side branch chambers that go nowhere. But it helps quiet things down. It's like a resonator only designed to kill a very specific sound range as opposed to just being in line.
