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Message started by diamond jim on 03/31/09 at 19:43:26

Title: New spin on the exhaust thumb screw idea
Post by diamond jim on 03/31/09 at 19:43:26

This is a prototype for a remotely adjustable exhaust plate baffle thingy.

http://i255.photobucket.com/albums/hh128/russ_diamond_jim/1-28.jpg

I put this one together just to see how well it would work. It is surprisingly sturdy and rotates smooth with just the right amount of resistance. The idea is to add one of these to my drag pipe possibly in the area just before the frame's exhaust mounting bracket. I could run open pipe when desired or close it when I don't want full open pipe via a simple cable push or pull. I've always wanted one of these on my motorcycle exhaust but never tried making one. I'm sure somebody somewhere makes and sells these but I've never seen one for sale. The lever would be where the cable for remote adjustment would be connected.

Title: Re: New spin on the exhaust thumb screw idea
Post by Max_Morley on 03/31/09 at 20:16:57

My recollection is that there we called "snuff-or-not" when we had them for the Honda CL250/305's many years ago. They were no adjustable on the fly, but had stops for cross or with the flow. Seems like one of the major manufactures of exhausts is making and electrical switching version now. Just do it. Max

Title: Re: New spin on the exhaust thumb screw idea
Post by diamond jim on 03/31/09 at 21:00:57

Yeah, I saw the site with the HD add. Those seem cool but I bet very pricey.

I figure one of these choke cables will work fine:
http://www.sintlauto.com/pcat-gifs/products-small/choke-cables.jpg

Title: Re: New spin on the exhaust thumb screw idea
Post by diamond jim on 04/01/09 at 05:59:04

I put the prototype one in about 2" in front of the mounting bracket. I like it. Open, the pipe has got the deep sound of a long, open pipe. Closed, it takes the volume down a good bit but also changes the pitch some to where it's got a little bit of a cool raspy edge to it. I imagine that's from the exhaust being squeezed around the washer. I've got to go to work but I'll try to work on it some more tonight. I'll post a youtube sound clip soon. I've got to go hunt down a choke cable and fab a mounting bracket.

Title: Re: New spin on the exhaust thumb screw idea
Post by diamond jim on 04/01/09 at 10:48:00

Went and picked up an auto choke conversion kit for $12. They also had just the cable for $7. But the kit has all kinds of brackets and mounts for the cable. Sweet!

Title: Re: New spin on the exhaust thumb screw idea
Post by diamond jim on 04/01/09 at 21:43:31

Done with the exhaust pipe mount. I'll put the pipe on tomorrow. I'm not sure where I'll put the knob yet.

http://i255.photobucket.com/albums/hh128/russ_diamond_jim/S4021916.jpg
http://i255.photobucket.com/albums/hh128/russ_diamond_jim/S4021913.jpg

Title: Re: New spin on the exhaust thumb screw idea
Post by Yonuh Adisi on 04/01/09 at 22:34:14

Just be sure to post the how-toos of your experiments in the tech/ref section once you have completed your testing.

Title: Re: New spin on the exhaust thumb screw idea
Post by diamond jim on 04/01/09 at 23:22:08

4A7C7D667B52777A607A130 wrote:

Just be sure to post the how-toos of your experiments in the tech/ref section once you have completed your testing.

Okay. Cool.

Title: Re: New spin on the exhaust thumb screw idea
Post by Gary On A Savage on 04/02/09 at 14:45:27

Dang Jim, slow down on all the cool mods!! I can't keep up with ya!

I was going to do the same to my Honda Shadow 1100 pipes. I added some packing to the (virtually useless) baffles that came with the V&H straight shots, but it came loose on one of the pipes. Going to try your "M50 fiberslass rebaffle" you posted on another site. I'll be adding the adjustable lollipop to the pipes, but I'm thinking of putting them at the end of the pipe after all.

Title: Re: New spin on the exhaust thumb screw idea
Post by diamond jim on 04/02/09 at 14:55:42

Cool. For the fibrosleeves I used the metal screen that is used for supporting mortar for faux rock/brick. It usually comes with a layer of tar paper glued to one side. As for the lollipop, I put my washer on a long piece of threaded rod and slid it into the pipe in various places while the bike was idling and revving some. Deeper usually sounds better but the end of the pipeis much, much easier to do.

Title: Re: New spin on the exhaust thumb screw idea
Post by Gary On A Savage on 04/02/09 at 20:14:33

What about a lollipop with a bigger hole in the middle? That's a pretty big washer you have on that one. More "straight through" flow for higher revs?

Also, what did you find different between the sound between the middle of the pipe verses the back of pipe. You said it sounded better. In what way?

Title: Re: New spin on the exhaust thumb screw idea
Post by diamond jim on 04/02/09 at 20:33:25

Gary, I was shooting for an outside the washer path but I might try it with the larger hole.

For the pipe, imagine making a sound through these three items: toilet paper tube, paper towel tube (like Bounty) and a Christmas gift wrapping paper tube. All of us have put each of these up to our mouths and made stupid sounds that made the kids laugh! The toilet paper tube will sound much like your own voice but a little more dull. The paper towel tube will add a little bass to your voice and the sound will resonate in the tube, making it sound deeper and richer. The gift wrap tube does the same but a whole lot better.

The longer the pipe AFTER the washer the deeper, richer the sound will be.

Title: Re: New spin on the exhaust thumb screw idea
Post by Bobbert on 04/02/09 at 21:03:45

If I were you, I would try hooking that to the throttle cable. Through every gear you would have the advantages of tighter pipe at lower RPM and open pipe at high rpms. No fidgeting as you ride.

This seems like something that should be measured and calibrated with a dyno.

Title: Re: New spin on the exhaust thumb screw idea
Post by diamond jim on 04/02/09 at 21:44:55

417C717661677C7E7C76130 wrote:

Ha ha, I had the same thought when I was working on it earlier.

Title: Re: New spin on the exhaust thumb screw idea
Post by verslagen1 on 04/02/09 at 21:46:37

Had a bit of a giggle today.
Riding down the superslab like normal in the HOV lane. And like normal I hit traffic 2/3's the way home. Pass a motorcop pulling in, pass a cage cop in the HOV, pass a HD bagger movin' over. I pat my head as I pass'em cause he looked like he was going to and did cross over the solid double yellow and white HOV line. He looked like trouble so I let him pass more cause I knew what was behind and would catch up sooner or later, so I was taken it easier than normal. Turned out he had loud as hell pipes. 100' back and he easily made my easy goin' high idlin' savage supertrapp sound like mouse farts. And he let one rip every time someone didn't take notice that king loud @ss was comin'. And he would... "wave" at those that took especially long to move over. I just grinned, thinkin' I could've squeezed thru there no problem. Well, finally after the motorcop and the cage cop finished waving to each other, up comes the motorcop. KLA was busy waving and communicating to notice me flashin' his @ss. So on comes my blinker and I move over to let motorcop on thru. He didn't look pleased cause he flashed KLA too. And pulled up next to him and they were "waving" and communicating much more politely then KLA was before. The m/cop was pointing at his pipes and at him then his pipes again. Enjoyed the show, but I had to pull onto the line cause if I hadn't the truck behind me would've ran over my mouse fartin' @ss. I shoulda put it neutral and grabbed hold we were goin' so slow. Ol' KLA and m/cop had a good long chat at a crawl. Finally the m/cop looked like he had enough communicatin' and rolled on. Ol' KLA waved much more politely now and was less insistent upon the road being clear. If fact, he urged me by. ;D