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Message started by Dadyo on 01/03/19 at 17:48:41

Title: A silly exaust question
Post by Dadyo on 01/03/19 at 17:48:41

Would there be any benefits for a 1 into 2 header and running two mufflers?

Title: Re: A silly exaust question
Post by Beerm8 on 01/03/19 at 21:02:36

stereo exaust sounds? Being the only savage in town with bilateral rooster tails? :D

Title: Re: A silly exaust question
Post by hotrod on 01/03/19 at 21:13:48

The Harley 350 Sprint was set up like that. Just for a balanced look I guess.

Title: Re: A silly exaust question
Post by Eegore on 01/04/19 at 05:43:23

To my knowledge there would be no performance benefits.

Title: Re: A silly exaust question
Post by ohiomoto on 01/04/19 at 06:44:36

Honda has been using dual silencers on their top of the line motocross bikes for several years now. They claim it makes the bikes handle better and who knows what else. Honda makes great motorcycles, but if it made "that" much of a difference, everyone would be doing it.

The first models used a single header pipe and then "Y" split the rear mufflers using a smaller diameter pipe on the shorter pipe to promote even flow into both pipes.

http://https://i.ebayimg.com/images/g/LSMAAOSwzyBbkA5R/s-l640.jpg

The latest variations spilt at the header pipe and use 2 separate silencer assemblies.

http://https://motocrossactionmag.com/wp-content/uploads/2018/05/19-Honda-CRF450R_RR34.jpg

Title: Re: A silly exaust question
Post by batman on 01/04/19 at 06:54:27

In a word, no, I think (depends on the mufflers) you'd be adding weight to the bike ,and might be making it harder to tune. 2into 1 adds to performance ,1into 2 just adds complexity .
The Honda 450 above may have a cam with overlap and with unequal exhaust pipe length may have better power do to doubling it's chances of wave tuning( weaker but spread across more of the rpm range). T he savage cam has zero overlap and therefore zero chance of wave tuning, thus no performance gain with a stock cam.

Title: Re: A silly exaust question
Post by Gary_in_NJ on 01/04/19 at 06:56:30

If you are looking to unnecessarily add weight to the bike, that would be the way to go. I have a twin Yosh system on my DRZ. Looks great. Sounds awesome. Adds about 15 pounds over the single system. I did it purely for looks.

Title: Re: A silly exaust question
Post by batman on 01/04/19 at 07:23:19

Gary ,Did you notice any increase in performance?

Title: Re: A silly exaust question
Post by Gary_in_NJ on 01/04/19 at 14:45:27

None.

Title: Re: A silly exaust question
Post by oldNslow on 01/04/19 at 18:06:21

7151535B4651340 wrote:

To my knowledge there would be no performance benefits.

Not on a Savage for sure.

However on something like this:

https://www.youtube.com/watch?v=lFOG4ymZyqc

250cc single. about 50 hp. 155mph or so top speed. Alex Rins finished third in the 2014 Moto3 championship on that bike.

Title: Re: A silly exaust question
Post by GOF on 01/04/19 at 18:18:24

4876777B6975741A0 wrote:

[quote author=7151535B4651340 link=1546566521/0#3 date=1546609403]
To my knowledge there would be no performance benefits.

Title: Re: A silly exaust question
Post by Dadyo on 01/04/19 at 20:53:39

The reason I asked is because I got very lucky this week, I found an 85 gs450f at my local junkyard. I got the wheels, (mags 16 in rear, 19 front). The rear has same axel, the brake hub is a direct fit so once I get the spacers right the tab a in slot b works no probs. No mods on that side. The sprockets and chain are in good shape so the chain mod is almost free and gives me a good place to start figuring sprocket tooth combos. The mufflers are cool and in good shape.( Hence ; a silly exaust question). Also got the gas tank. brackets for the rear pegs and mufflers, also a perfect start on rear sets. I haven't tried the front wheel yet. Doing that tomorrow hopefully that goes as good as the rear. It looks awesome with the mag on the back. I got a bunch of stuff for $100 bucks and found almost all the parts I was looking for. I will keep posting as I figure out what works and what doesn't. Have a great weekend everyone.

Title: Re: A silly exaust question
Post by Dave on 01/05/19 at 04:04:59

I wouldn't think that mufflers made for a 450cc twin would work all that well on a 650cc single - even if you used both of them.

The Harley Dyna muffler works well - because they were made for a cylinder very nearly the same size as the Savage.

Title: Re: A silly exaust question
Post by Dadyo on 01/05/19 at 18:32:58

I wasn't seriously thinking of using both of them, I've been learning about how the exaust works and I got both mufflers,so that got me thinking about it. The guy on u tube didn't cover that configuration. I didn't know our bikes do not have valve overlap. Now I get it. I got the baffles with them plus the back plates are adjustable , hopefully I can open them enough, they are Short and look cool.

Title: Re: A silly exaust question
Post by MMRanch on 01/08/19 at 18:40:22

Dadyo

I've experimented a little with making my own baffles. If the exhaust can't free flow out the pipe the the pressurized gases in the muffler acts as a noise reducer in effect , so you can have loud free flow at low Putt-Putt speeds , and nicely baffled at interstate speeds out of the same pipe (its a balancing act) .
Try , them and let us know how it works ???

Dave , that 18" Reverse-Cone you got sounds "Really Good" . :)

Dadyo
How did the pulley fit on the sprocket side ? I started the Mag Wheel switch today but the LS 650 pulley hub don't fit the GS450 wheel. So , I'm at an impasse .

Title: Re: A silly exaust question
Post by Dadyo on 01/12/19 at 03:11:38

I was looking at all of that last night and it looks like the brake side will work if you extend the tab that locks the hub to the swing arm no biggie. On the sprocket side all of the drive dogs are thicker and the OD is slightly larger, plus all of the bearing surfaces are larger. My solution is to grind the OD of drive dogs down so that they fit into rubbers, then clearance the width of the slots in the rubbers to fit the wider dogs. The rubbers in my rim are the same except the ones in the original wheel are larger all the way around, so if I messed up the ones that came in gs wheel I can adjust the others. It looks like I'll be able to use the factory spacers and the sprocket conversion will work the same.
I did not! Start grinding or cutting anything, I still need to double-check everything. Here is a pic with both wheels test fitted, I really like the way it looks so if it'll all work I am going to do it. The best part is that I will have a 16 in wheel and tire selection is at least double. I'm about to start my build thread and will keep you posted. Let me know how it goes for you. I need all the help I can get.

Title: Re: A silly exaust question
Post by Dadyo on 01/12/19 at 19:09:57

I got off topic this morning sorry bout that fellas. Back to exaust! After taking another at the mufflers I picked up last week, noticed that they have a smaller tube down the middle, then a plate with two smaller (1in diameter by 2 or 3 in long) tubes through that about 4" from the back plate. The back plate is removable and has 4 3/8" holes with room for a few more. I'm going to try it out, who knows maybe it will work.

Title: Re: A silly exaust question
Post by ohiomoto on 05/03/19 at 06:43:05

73565B52010E010E370 wrote:

---------------------------

How are those wheels working out? Did you start your build thread?