SuzukiSavage.com - Dyna Muffler

pg Serious Thumper Offline Posts: 5273 In Transit	Dyna Muffler 01/28/14 at 07:52:12 I'm looking to do the dyna muffler conversion. For anyone who may have done it do you know specifically which muffler to look for? Over the years they have made a number of different dyna models. Thanks and best regards.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18099 Camp Springs, Kentucky Gender:	Re: Dyna Muffler Reply #1 - 01/28/14 at 08:44:51 The Technical Section and the Table of Contents with links can be very useful and informative. http://suzukisavage.com/cgi-bin/YaBB.pl?num=1298689417
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seedubs1 YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 34	Re: Dyna Muffler Reply #2 - 01/28/14 at 09:39:34 Just try to find one of the older ones that doesn't have the cross pipe. Otherwise, you'll have to weld the hole shut.
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Re: Dyna Muffler
Reply #3 - 01/28/14 at 09:44:27

And if you don't want a muffler with a catalytic convertor inside - be careful what you buy from the California area. The mufflers don't seem to hurt performance - but they to tend to turn blue and other heat related colors at the font of the pipe where the converter is located.

The non-catalytic mufflers have a large 1-1/4" tube if you look into the entrance of the muffler - while the catalytic ones have a honeycomb looking mesh with small holes visible just inside the muffler intlet end.

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houstonbofh Senior Member Offline SuzukiSavage.com Rocks! Posts: 420 Houston, TX Gender:	Re: Dyna Muffler Reply #4 - 01/28/14 at 15:38:15 Aida's has a cat in it, and I love it! There is a cool orange glow from the pipe when I follow her. And it has a heat shield to hide the bluing.
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pg Serious Thumper Offline Posts: 5273 In Transit	Re: Dyna Muffler Reply #5 - 01/28/14 at 16:32:50 Yeah, I read that thread in the tech section. There is a whole lot of great info there. I went to ebay today and they had a bunch of different stuff. I don't want to order something to find out it isn't going to fit well. And then I'll have to figure out the proper jet settings and probably have to spend more extra $ than necessary.
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houstonbofh Senior Member Offline SuzukiSavage.com Rocks! Posts: 420 Houston, TX Gender:	Re: Dyna Muffler Reply #6 - 01/29/14 at 16:45:45 Go to a local Harley dealer and ask to buy a pull from the pile. They will have a big pile. I paid $20.
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pg Serious Thumper Offline Posts: 5273 In Transit	Re: Dyna Muffler Reply #7 - 01/29/14 at 17:05:25 Sounds good except finding a close dealer. I got a flat tire a 100 yards from the local hd and they wouldn't help me. I'll have to go 1.5 hours to get to the next closest one. The real important part is that it has the baffles, is that correct? Did you have to rejet it to make it run right? HD 65747-94
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Re: Dyna Muffler
Reply #8 - 01/29/14 at 17:30:59

The "baffle" on these mufflers is merely a single plate the blocks the tube running through the muffler core. This forces the exhaust to go around the plate and into the baffles that are internally built into the muffler. Sometimes this plate (disk) can fall out or be knocked out via a broomstick and hammer by some enterprising owner seeking more noise. My understanding from others on this site is that if the plate is missing, it can be replaced by driving a proper sized auto engine freeze plug down the inlet of the muffler, thus restoring factory baffling.

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Kirill Timofeev Ex Member	Re: Dyna Muffler Reply #9 - 01/29/14 at 20:56:25 Do I understand correctly, that since dyna differs from stock muffler overall performance would become worse? With stock muffler folks claim to have 50mpg, what mpg can be expected with dyna?
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OK.... so what's the
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Re: Dyna Muffler
Reply #10 - 01/29/14 at 21:20:18

MPG is the same or better... performance gains from just a muffler change are minimal...(mostly just feels more powerful because of the nicer sound)...
...but, breathing is definitely not reduced... so, there may be some actual HP gain...
Mostly,.. it's just a better made, nicer chrome, lighter, and better sounding muffler... that alone is worth the price...

The stock muffler is restricted to meet required noise levels... it's not tuned to perform...
Harley seems to get away with higher noise levels... I don't know how or why...

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Ludicrous Speed !... ... Huh

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Kirill Timofeev Ex Member	Re: Dyna Muffler Reply #11 - 01/29/14 at 21:37:51 I'm confused. If after installing dyna I need to use bigger jet how I can get better mpg?
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: Dyna Muffler Reply #12 - 01/29/14 at 21:44:35 if you change the muf to a lower back pressure, it'll lean out the fuel mix. this why you change the jet, to get it back to optimum. so done right, mpg will remain the same.
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OK.... so what's the
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Re: Dyna Muffler
Reply #13 - 01/29/14 at 21:51:31

There is an optimal tune for MPG's,.. and a different one for HP,... and yet a different one for street performance... and another one to meet EPA emission and noise regulations...

An open pipe would make max HP at full throttle and be good for drag racing with a high rev launch, but it would barely idle...

A certain amount of tuning will remove EPA restrictions, and make the bike breathe better... without hurting MPG's or narrowing torque... all you are doing is correcting factory restrictions...
Even with a bigger jet,... if you are making the engine more efficient by removing restrictions only intended to reduce noise and emissions, you can get better MPG and power...
You will just use less throttle at a given speed...
If you start to go further... you will begin trading MPG for power, and HP for torqueband width...

You tune for how you ride... most of us, like stop and go, and curves and hills... so we tend to recommend mild changes that will retain good torque...
Thumpers do well in that environment...

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Ludicrous Speed !... ... Huh

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Kirill Timofeev Ex Member	Re: Dyna Muffler Reply #14 - 01/29/14 at 22:55:26 Thanks a lot for clarification Verslagen and Serowbot, this makes perfect sense.
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