chamber design (mufflers). I'm stuck, please help!


by faytmorgan
Tags: chamber, design, mufflers, stuck
faytmorgan
faytmorgan is offline
#1
Nov11-12, 11:45 PM
P: 33
my lonesome have been working on a set of mufflers that don't sound like fecal matter. I am having a difficult time finding just the mufflers (race mufflers). I DO NOT want an entire exhaust system. I do have the capability of fabing up mufflers, I have custom made equal length headers to an x pipe thus far. I DO NOT want the mufflers to have those two little connections keeping them together. I will be making this a side exit.

The motor is a carbed 5.5 lt small journal sbc. Should be able to make power to 7800 or so rpm.

I am looking for the highest frequency/note/tone/pitch I can get. I very much enjoy the higher, crisper, cleaner sound the euroapean v8 makes. I hate with a passion the rumble of the harley/dumptruck American v8. I have heard flowmasters on these cars. I don't know if it was the particular flowmaster series or what. But that m3 was a dumptruck. I am trying to avoid that.

Sounds like a chevy small block doing a dyno pull to me...
htt p: //w ww.youtu be. com/watch?v=Y-mGGf5Ncx8

h ttp://ww w.yout ube. com/watch?v=5BhxWH9Dg_M]BMW E92 M3 Eisenmann race exhaust - YouTube[/url]

amazing high frequency sound
htt p://w ww.youtube.co m/watch?v=SbT0IqFIfnc]iPE Innotech E92 M3 Evolution Valvetronic Exhaust System F1 Sound - YouTub

h ttp://www.y outube.com/watch?v=n_n8HiJzA6A]BMW M3 iPe Valvetronic Exhaust Sound (Drive By, Downshift, Rev) - You Tube

Here is a cutaway of a corsa muffler.

ht tp://s805.b eta.photobucket.co m/user/Phastek/media/March%202010%20Show/Corsa1.jpg.html?filters[term]=recent&filters[primary] =images

I am rather sure that the chambers in the muffler can be designed as such to reflect frequencies to cancel out the unwanted frequencies. I just can't find the math anywhere to determine the dimensions of the chambers.

I am working with 17.9 inch long primary tubes that are 1 and 5/8 in diameter, they go into a 2.5 inch collector, that then goes into a 3 inch x pipe, that will then go directly to the side exit mufflers. I am keeping it as short as possible to help retain the sound I am after.

This is what I am avoiding.
htt p://ww w.youtube.c om/watch?v=klmAQFh1l-E]Magnaflow Exhaust on a Chevy Truck - YouTube

Same motor different car different mufflers...
http://w ww.youtube.com/watch?v=IVWZMKMmjMQ

So does anyone know how to design the muffler to achieve this? Or designing a resonator to do this? Or simply the chambers inside the muffler to do this?

I am so stuck. Also I don't think a helmholts resonator of any kind will do the trick. that would only cancel out the freq. I think this is more like a musical instrument where the sound entering is not going to be the sound at the bell of the horn coming out.
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faytmorgan
faytmorgan is offline
#2
Nov18-12, 06:22 PM
P: 33
bump
Ranger Mike
Ranger Mike is offline
#3
Dec18-12, 05:49 AM
Sci Advisor
PF Gold
P: 1,422
do you have the engine running? About the only way to " tune " the exhasut to a particular freq. is to fabricate a muffler/resonator that can be adjustable length and experiment. By shortening or lengthening th baffle arrangment to housing length you should be able to find the note you want.


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