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Message started by SALB on 07/16/12 at 20:20:19

Title: Stainless Exhaust?
Post by SALB on 07/16/12 at 20:20:19

I have access to some 2" stainless tubing, food grade 304 or 316. What I'd like to do is to make a drag pipe using a generic baffle. What I am not sure about is whether or not stainless will blue under extreme heat, or if there is any special way I'll need to weld the mounting tabs on. :-/ If it will work, I plan on polishing it to a brilliant sheen. 8-) Finally, which end would be better to mount the baffle? If it works, great! Otherwise, I'll buy some exhaust tubing from the local muffler shop, and paint it black. :-/

Title: Re: Stainless Exhaust?
Post by justin_o_guy2 on 07/16/12 at 20:59:29

HOw about saving that expensive stuff & going to the muffler shop & getting a piece of 2" made up & work with that. Once you get everything working & tuned, take your stainless piece in & duplicate the proven design. IOW, experimenting with that One Piece of stainless is likely to end up in an unhappy moment,

Title: Re: Stainless Exhaust?
Post by SALB on 07/16/12 at 21:32:13

I'm not too concerned with fabricating it. I'm very concerned about how the stainless will react to the heat, and wondering which end to put the baffle, although that can easily be changed from one end to the other. Oh, did I mention the stainless was FREE! :) The baffle and jet kit are the only things I'll have to by IF this will work. 8-)

Title: Re: Stainless Exhaust?
Post by ralfyguy on 07/16/12 at 21:40:46

I got a debaffled stock exhaust with a SS end plate. At first longer run it turned golden and then purple. Second long run it started to look like silver. Now it starts to look like in the beginning. So I'm thinking about polishing it. It seems it got annealed real good. Stainless steel always dicolors quickly under heat.

Title: Re: Stainless Exhaust?
Post by SALB on 07/16/12 at 21:48:04

Thanks, Ralfyguy, that's what I was wanting to know. Sounds as if you get kind of a rainbow effect. I might have to think about it, it suits me to be "different" every now and then! 8-)

Title: Re: Stainless Exhaust?
Post by ralfyguy on 07/16/12 at 21:54:19

If the whole exhaust is getting discovered like a rainbow, it could actually look kinda cool depending on the look of the rest of the bike.

Title: Re: Stainless Exhaust?
Post by verslagen1 on 07/16/12 at 21:59:03

Get some 1.5" plain steel and make it like the header, and put the 2" over the top.

Title: Re: Stainless Exhaust?
Post by spacepirates on 07/17/12 at 09:04:49

As to which end to mount the baffle; Diamond Jim had a thread a while back about making a custom exhaust. When it came time to place the baffle, what he did was slide it in the back and attached a hook to it. He turn the bike on and slid the baffle back and forth through the pipe testing different positions and different throttle ranges till he settled on the location for the baffle.

I think he went with the end closest to the header, but since exhaust notes are all about personal preference, you might want to consider the slide-to-tune approach yourself.

Title: Re: Stainless Exhaust?
Post by Serowbot on 07/17/12 at 09:49:01

Stainless, blues way better than chrome... Nice!... ;)...

Baffle goes in the back...
...(otherwise, the air comes out all floppy and limp)... :-?...

2" is awfully big for a pipe... I don't know what's involved with making a double-wall pipe,... but it would help with tuning and exhaust scavenging... ... might be toying with burnt exhaust vales...

Title: Re: Stainless Exhaust?
Post by justin_o_guy2 on 07/17/12 at 10:00:03

Rowboat said

might be toying with burnt exhaust vales...

What would cause that?

Title: Re: Stainless Exhaust?
Post by Serowbot on 07/17/12 at 10:22:10

I think it's called, exhaust pulse reversion... anyway,.. heated exhaust is not scavenged and reverts back into the valves, between pulses. Heat builds up there...

I'm no rocket scientist... but, that's what I've been told... :-?...

Title: Re: Stainless Exhaust?
Post by justin_o_guy2 on 07/17/12 at 10:42:58

Ahhh HA!,, That mite explain the little cone welded inside the end of the header,, to catch that pulse..

Title: Re: Stainless Exhaust?
Post by 360k+ on 07/18/12 at 10:47:16

A "tuned exhaust" will attempt to take advantage of that pulse. The pipe diameter, length, and RPM range are the factors. It's based on the principles of compression and rarification, and basically exploits the resonance of the pipe at a certain frequency (RPM).

Sorry to get off subject.

Title: Re: Stainless Exhaust?
Post by teabowl13 on 07/18/12 at 13:54:53

I don't think that's off topic at all really.
i don't know the details, but I do know that a 2" exhaust pipe will be a WHOLE lot different than the triple-walled stock pipe that's 2" outside, but really only 1.70" inches or so inside.
That's going to make a very big difference in terms of tuning. Sounds like Lancer's territory to me... I believe he's made a larger diameter exhaust for his Savage...

Title: Re: Stainless Exhaust?
Post by Mario Verasso on 07/18/12 at 15:18:37

I am interested in the outcome of this thread. I am wanting to cut the cone out and port & polish the exhaust port. I understand i will need back pressure, but already have a replacement muffler (with baffle) just like i have on it now. My head pipe blues & so does my muffler, right now.

Title: Re: Stainless Exhaust?
Post by SALB on 07/18/12 at 19:41:17

I have no plans of modifying the head pipe, just adding a straight pipe with a universal straight through baffle. I'm figuring that if I get one about 18" long with an inside diameter of @1 3/4" I will keep the back pressure and still have at least a foot of open 2" to smooth out the sound pulses.

Title: Re: Stainless Exhaust?
Post by spacepirates on 07/19/12 at 05:10:04

Have you checked out some of the exhaust theory threads? If you can follow the math/science in them, they give you an idea of how I.D. and length of a pipe can add/take away power to a given RPM range.

So if you wanted to give a little more grunt to say the 3500 RPM range, you'd have an X length exhaust, but something at the 45000 RPM range would be a touch shorter.

Might be worth looking into. There is also the old saying that it is easy to cut something shorter if you find it is too long than to add more if you find it is too short.