2017 model year EBRs?

[EBRRider]

Hmm, interesting thought.

In vaguely related field, jet engine test cells use a oval cross section exhaust duct/muffler as well. A jet engine test cell is basically a building where they bolt a jet engine down for operational testing. The exhaust from the engine is directed out the back of the building through a long ~10 FT diameter pipe and then against a baffle which directs it upward. The pipe is constructed basically like a big glass pack muffler; with a solid outer shell, a bunch of lead and steel wool, and perforated inner panels. There are also baffled air inlets to the building to provide air to the engine while it's running. The whole idea is to absorb sound so you're not shaking the windows out of nearby buildings while you're testing the engine at WOT. Here's a picture of one i worked on at NAS New Orleans some years ago:

Attachment 1349

Up until recently, the ducts were oval in cross section. Then somebody did some experiments with a scaled one made with a square cross section, which would be much simpler to fabricate. Turns out the square one did an even better job than the oval one of killing the sound. I'm not sure if they've built one yet; a couple of guys I used to work with were trying to push a project through to build one like this but their boss was EXTREMELY conservative and nixed the idea.

Anyway, it occurs to me, maybe a square cross section muffler would work better at absorbing sound.

OK- who's gonna try the first square cross section muffler?

Hmm, interesting thought.

[d_adams]

The original 1125 muffler was more flat planes and was effective, just very ugly from what I had been told. Helmholtz resonator, there's different ways to design them. Different sized chambers = different frequencies cancelled out.

[1190SX]

Hmm, interesting thought.

In vaguely related field, jet engine test cells use a oval cross section exhaust duct/muffler as well. A jet engine test cell is basically a building where they bolt a jet engine down for operational testing. The exhaust from the engine is directed out the back of the building through a long ~10 FT diameter pipe and then against a baffle which directs it upward. The pipe is constructed basically like a big glass pack muffler; with a solid outer shell, a bunch of lead and steel wool, and perforated inner panels. There are also baffled air inlets to the building to provide air to the engine while it's running. The whole idea is to absorb sound so you're not shaking the windows out of nearby buildings while you're testing the engine at WOT. Here's a picture of one i worked on at NAS New Orleans some years ago:

Attachment 1349

Up until recently, the ducts were oval in cross section. Then somebody did some experiments with a scaled one made with a square cross section, which would be much simpler to fabricate. Turns out the square one did an even better job than the oval one of killing the sound. I'm not sure if they've built one yet; a couple of guys I used to work with were trying to push a project through to build one like this but their boss was EXTREMELY conservative and nixed the idea.

Anyway, it occurs to me, maybe a square cross section muffler would work better at absorbing sound.

OK- who's gonna try the first square cross section muffler?

Well, aside from it being aesthetically unappealing to most people, I would gladly try one out. Just need another bike to do it on, so if anyone wants to donate one....


Hate to say it, but the novelty of the quiet system has worn off. I'm ready to put Deans system on lol.

[EBRRider]

Well, aside from it being aesthetically unappealing to most people, I would gladly try one out. Just need another bike to do it on, so if anyone wants to donate one....


Hate to say it, but the novelty of the quiet system has worn off. I'm ready to put Deans system on lol.

I like your concept, bad ass adams pipes wins.

[Unbound]

Not sure who has one in CA, but I will have one soon. Dean is working on it. I am in Norcal though.

Me too! We might be the only ones!

[TerryS1980]

Square is likely not absorbing more sound but the sound waves are canceling each other out bouncing in the corners.

Oval is only better than round if it has more volume and material in it.

[Chazaag]

I was at EBR and overheard that they received the 2017 certification.....

[Sparky]

That's the best news I've heard today.

[buell-fan]

Chaz, did you overhear whether they would restart full production, or at the very least, order-based production?

[Chazaag]

Chaz, did you overhear whether they would restart full production, or at the very least, order-based production?

Didnt mean to mislead anyone- I was addressing the earlier statement that EBR couldn't make 2017 bikes bc they had not received 2017 certification - I was present last April when EBR employees were talking that they had obtained 2017 certification....