So, I've got a pair of OEM mufflers on my bike that are still in decent shape. However, since I've gone to the trouble of stripping and repainting the tank and fenders, and will polish the engine side covers and brake plates/scoop, I'll likely end up replacing the pipes and mufflers because the handful of small dings and scratches now look magnified next to the flawless bodywork and paint.
I like the '71 megaphone style as opposed to earlier Meriden sausages or the BSA Rocket style (though both look fine on a Triumph of my vintage). But I have a few questions for folks who have actually fitted Dunstall replica, megaphone-style mufflers:
First - I have three choices--two of which are readily available in the U.S. (see pics), and all of which have removable baffles for repacking. The first is EMGO's version; the second brand has a 'red cap' outlet that is otherwise identical to the EMGO's, but has seamless construction and is available for just a little more money; the third has a similar but slightly difference outlet and a small outward flare like the bell of a trumpet, but as I've said don't appear available on this side of the Pond.
Question: Has anyone handled the EMGO or 'red cap' mufflers in the flesh? Aside from the seamless finish on the 'red cap' brand, which is pretty sexy, is the steel or handiwork superior on either one?
Second - I found a website (that I forgot to bookmark and can't find) which showed the 'red cap' brand disassembled. One photo showed that the perforated tube had a perforated disc tack-welded in place midway along the bore.
Question: Does anyone know whether the EMGO version also has this center disc?
Frankly, I'd be inclined to knock it out, as generally with a glass-wrapped perforated tube, you do NOT want all or most of the gasses forced outward through the holes and into the packing, around the disc, and then back inward again into the central bore. That is a method Harley used in its '60s-era Sportster mufflers--but they did not have glass packing so operated much like an auto muffler. In a glass pack muffler that already has a multi-hole diffuser/restrictor at the outlet, I think the perforated disc midway along the central tube would be too much restriction, and if I want an internal baffling style that redirects flow within the muffler body, I'll stick with OEM mufflers (which I can still get new).
Third - has anyone experimented with the jetting in stock Amal carbs with this style of muffler?
Fourth - I have read people's reviews who claim superior performance out of the EMGOs, and sound not obnoxiously louder than stock if one pulls the baffles and installs sufficient good-quality packing.
Question: Does anyone have a video with audio of either of these internally very similar) mufflers fitted to a Unit 650? What about performance vs. stock?
Thanks!
I like the '71 megaphone style as opposed to earlier Meriden sausages or the BSA Rocket style (though both look fine on a Triumph of my vintage). But I have a few questions for folks who have actually fitted Dunstall replica, megaphone-style mufflers:
First - I have three choices--two of which are readily available in the U.S. (see pics), and all of which have removable baffles for repacking. The first is EMGO's version; the second brand has a 'red cap' outlet that is otherwise identical to the EMGO's, but has seamless construction and is available for just a little more money; the third has a similar but slightly difference outlet and a small outward flare like the bell of a trumpet, but as I've said don't appear available on this side of the Pond.
Question: Has anyone handled the EMGO or 'red cap' mufflers in the flesh? Aside from the seamless finish on the 'red cap' brand, which is pretty sexy, is the steel or handiwork superior on either one?
Second - I found a website (that I forgot to bookmark and can't find) which showed the 'red cap' brand disassembled. One photo showed that the perforated tube had a perforated disc tack-welded in place midway along the bore.
Question: Does anyone know whether the EMGO version also has this center disc?
Frankly, I'd be inclined to knock it out, as generally with a glass-wrapped perforated tube, you do NOT want all or most of the gasses forced outward through the holes and into the packing, around the disc, and then back inward again into the central bore. That is a method Harley used in its '60s-era Sportster mufflers--but they did not have glass packing so operated much like an auto muffler. In a glass pack muffler that already has a multi-hole diffuser/restrictor at the outlet, I think the perforated disc midway along the central tube would be too much restriction, and if I want an internal baffling style that redirects flow within the muffler body, I'll stick with OEM mufflers (which I can still get new).
Third - has anyone experimented with the jetting in stock Amal carbs with this style of muffler?
Fourth - I have read people's reviews who claim superior performance out of the EMGOs, and sound not obnoxiously louder than stock if one pulls the baffles and installs sufficient good-quality packing.
Question: Does anyone have a video with audio of either of these internally very similar) mufflers fitted to a Unit 650? What about performance vs. stock?
Thanks!
