Homemade 3" Exhaust Resonator...
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Homemade 3" Exhaust Resonator...
Here are a few pix of an exhaust resonator I'm workin' on to quiet down that Thermal 3".
I've made a flex joint very much like the factory style (only bigger) instead of the typical flex-tube style.
Here ya go:
Here are the parts I used:
(1) piece of 3" x .065 wall stainless and drilled 5/16" holes in it.
(1) piece of 4" stainless tubing
(2) endcaps made of 11 gauge stainless - 4.00 O.D. x 3.06 I.D. (These slip over the 3" piece and butt up to the ends of a 4" diameter piece.
(1) O2 bung
(1) 3" x 3 bolt flange
(1) 2.5 to 3" adapter flange (I made this flange out of a piece of 5" diameter x 1.5" thick steel). I flared it to 3" on the resonator side and tapered it on the other side to fit a ball-type pivoting flange like the stock Honda style. Where those 2 diameters meet in the middle of the part, it measures 2.56" to be fairly consistent with the 2.5" downpipe. The outer part of the flange is 1/2" thick. (overkill)
(1) radiused-type pivoting flange to allow for flex. I couldn't see paying $29.00 for a Honda one, so I made one at work (during break, of course ) on a CNC lathe I run. I made the O.D. 3" and the I.D. 2.520" to slip over the 2.5" downpipe. I don't know if the material is adequate, but I'll find out one of these days. I used aluminum for this. The design is like stock where the "gasket" has a radiused outer surface that fits into a tapered flange section that allows for flexing of the motor without losing a seal on the exhaust. I'll also be using the factory exhaust "springs" (to permit the flexing) with stainless hardware .
I may put some type of fiberglass? packing between the 3" and 4" pipes for added quietness.
I just need to weld it up now.
Resonator and pivot gasket for downpipe...
Inside the resonator...
Partially assembled, but not welded...
I've made a flex joint very much like the factory style (only bigger) instead of the typical flex-tube style.
Here ya go:
Here are the parts I used:
(1) piece of 3" x .065 wall stainless and drilled 5/16" holes in it.
(1) piece of 4" stainless tubing
(2) endcaps made of 11 gauge stainless - 4.00 O.D. x 3.06 I.D. (These slip over the 3" piece and butt up to the ends of a 4" diameter piece.
(1) O2 bung
(1) 3" x 3 bolt flange
(1) 2.5 to 3" adapter flange (I made this flange out of a piece of 5" diameter x 1.5" thick steel). I flared it to 3" on the resonator side and tapered it on the other side to fit a ball-type pivoting flange like the stock Honda style. Where those 2 diameters meet in the middle of the part, it measures 2.56" to be fairly consistent with the 2.5" downpipe. The outer part of the flange is 1/2" thick. (overkill)
(1) radiused-type pivoting flange to allow for flex. I couldn't see paying $29.00 for a Honda one, so I made one at work (during break, of course ) on a CNC lathe I run. I made the O.D. 3" and the I.D. 2.520" to slip over the 2.5" downpipe. I don't know if the material is adequate, but I'll find out one of these days. I used aluminum for this. The design is like stock where the "gasket" has a radiused outer surface that fits into a tapered flange section that allows for flexing of the motor without losing a seal on the exhaust. I'll also be using the factory exhaust "springs" (to permit the flexing) with stainless hardware .
I may put some type of fiberglass? packing between the 3" and 4" pipes for added quietness.
I just need to weld it up now.
Resonator and pivot gasket for downpipe...
Inside the resonator...
Partially assembled, but not welded...
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Re: Homemade 3" Exhaust Resonator... (TheShocker)
I'll let you know how it does. I've made one of these before for my old JRSC '94 GS-R. It was 2.25" pipe w/ a 3" can assembled like the one above, but it wasn't stainless. With no resonator at all, it sounded like a damn dump truck!!! Way too loud! Just the resonator (with no fiberglass packing) it made a huge difference in noise and as you can see, it shouldn't be any more restrictive than a straight pipe.
Y'all take care,
Y'all take care,
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