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General Category >> Rubber Side Down! >> Emgo Shorty Muffler - good performance possible?
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Message started by strang on 05/19/15 at 13:13:51

Title: Emgo Shorty Muffler - good performance possible?
Post by strang on 05/19/15 at 13:13:51

I've got an Emgo shorty muffler sitting on the shelf at the moment and before I go to the hassle of fitting it, wondered if it is actually possible to get good performance with the Savage and this type of muffler?
Not worried about decibel concerns just how it would compare performance wise to the Dyna muffler, which I used to have. Happy to rejet and all that.
http://i139.photobucket.com/albums/q319/theutilitybelt/emgoshorty.jpg (http://s139.photobucket.com/user/theutilitybelt/media/emgoshorty.jpg.html)

Title: Re: Emgo Shorty Muffler - good performance possibl
Post by Dave on 05/19/15 at 18:13:05

If you look into one end.....do you see out the other side?

Title: Re: Emgo Shorty Muffler - good performance possibl
Post by strang on 05/20/15 at 02:06:53

Yes it's straight through.
Has baffle/mesh that allows exhaust to go into the larger section.

Title: Re: Emgo Shorty Muffler - good performance possibl
Post by Dave on 05/20/15 at 03:19:36

You will get a smoother running and easier to jet the carb with a muffler that is not straight through. The energy waves/pulses can bounce back and forth through the straight pipe and result in power loss at rpm's where the frequency is out of phase with the exhaust stroke.

https://www.youtube.com/watch?v=KjKUKhHQLHg

Title: Re: Emgo Shorty Muffler - good performance possibl
Post by Arnold on 05/20/15 at 06:20:26

I got the same muffler on right now, it's loud as hell but it seems to work well, some backfiring is a given with that one... Wish it was more restricted.

Title: Re: Emgo Shorty Muffler - good performance possibl
Post by Serowbot on 05/20/15 at 07:38:32

I'd skip it...

Title: Re: Emgo Shorty Muffler - good performance possibl
Post by old.indian on 05/20/15 at 08:02:06

I tried a 22" Cone that was a "straight through". I replaced it because the motor was getting too hot and it was too loud for me. With the 27" (baffled) Emgo the bike runs cooler and without a perceived loss of performance.

Title: Re: Emgo Shorty Muffler - good performance possibl
Post by strang on 05/20/15 at 12:27:29

According to the SUZUKI S40 / SAVAGE TUNING GUIDE (Lancer?) it says the ideal pipe length is 30":
https://docs.google.com/document/d/1-ng_s9DeJ14AJ7IUsuNeOqf9ZvqDE7o3Z3a_xEiHH2

This is where 30" sits if you do a scrambler pipe:
http://i330.photobucket.com/albums/l432/mike_odonovan/exhaust%201.jpg.png (http://s330.photobucket.com/user/mike_odonovan/media/exhaust%201.jpg.png.html)

With this in mind I wanted to have the muffler end before it gets to the rear shock. Ryca take the pipe beyond the shock and then add the muffler. I don't really like the look of this solution, but also isn't this too long a pipe for best tuning in theory? The tuning guide says over 32" is no good, yet the Ryca solution is about 50".

I was thinking today I might cut the shorty muffler open and and plug the straight through section a bit like Gyrobob's diagram?:
http://i258.photobucket.com/albums/hh253/Gyrobob_theOriginal/Muffler_dragpipestyle20bucks01a4icnh_zps52cdafb2.jpg (http://s258.photobucket.com/user/Gyrobob_theOriginal/media/Muffler_dragpipestyle20bucks01a4icnh_zps52cdafb2.jpg.html)