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 Post subject: Re: How Are These Pipes Made?
PostPosted: Fri Nov 09, 2018 3:29 pm 
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Location: Wisconsin
Smoker wrote:
Considering using interchangeable nozzles in the stinger connections for tuning. :smt045


That's a cool idea. Never heard of anyone doing that before!


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 Post subject: Re: How Are These Pipes Made?
PostPosted: Sat Nov 10, 2018 2:22 pm 
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Was just thinking about this mod. Not for an RZ500, but for an RZ350.

Obviously, a custom mod for fun, not for performance.

Could use this setup on the stingers between the last converging cone and the silencer.

Servo-operated, switch-activated, silencer bypass. :shock:

Image

I won't be doing this on my custom bikes, but I am making exhaust tips that can bolt on, instead of using the silencers. Again, just for fun, plus - I like the look of the straight tips. :mrgreen:


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 Post subject: Re: How Are These Pipes Made?
PostPosted: Sat Nov 10, 2018 4:38 pm 
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Location: Germany
Jeff B wrote:
Never heard of anyone doing that before!


Which doesn't mean that it wasn't done. A friend of mine uses this method since the late 90's for his pipes (sold under the brand SoniX in Germany)

Bypassing the cans with a servo operated valve is not a good idea as you have the optimal performance with cans.
What was done, was a variable stinger with a kind of rotary valve (cylinder with a 90 deg bore in it. If you rotate the cylinder, the cross section changes).

In a foulstroke you can add a bit of low-end torque and significantly lower noise emmisions by adding a servo operated valve. On my VTR, I adapted a Ducati valve and used a Ignitech box to control it.
http://www.vtr1000.de/forum/showthread.php?t=80683

One guy on the German RD forum tried a kind of interference connection between the two pipes as it's also common on 4 strokes. First he harvested some laughing, but then I had the idea to give it a try and do some simulations. Turned out that there is potential in increased low end when you can close the connection at higher rpm.
Unfortunately I didn't try it in hardware, yet, but if you show that to Jeff, he'll be able to do that for you.


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 Post subject: Re: How Are These Pipes Made?
PostPosted: Sat Nov 10, 2018 5:07 pm 
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MK wrote:
Unfortunately I didn't try it in hardware, yet, but if you show that to Jeff, he'll be able to do that for you.

Cool info!

But, I won't be doing the servo idea on any of my custom bikes.

Just posted it up because it's interesting and rare. Never seen a mod like this on a 2-stroke.

I will be using nozzles to tune the stingers.


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 Post subject: Re: How Are These Pipes Made?
PostPosted: Mon Nov 12, 2018 7:53 pm 
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Getting there with my spring hook design.
Thought you might like a peek.

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 Post subject: Re: How Are These Pipes Made?
PostPosted: Tue Nov 13, 2018 12:09 am 
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Very nice Pete. Every piece you do gets the same careful thinking and design, regardless of how small that part may be.

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1985 RZ500 47X Spec Project Bike
1986 RG500 ATR
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 Post subject: Re: How Are These Pipes Made?
PostPosted: Tue Nov 13, 2018 2:22 pm 
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An angled surface to attach the spring is not the smartest idea.
The spring force will drive it down the slope, i.e. may contact the spring with the pipe which will be noisy and leave ugly marks.

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 Post subject: Re: How Are These Pipes Made?
PostPosted: Wed Nov 14, 2018 7:37 am 
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MK wrote:
An angled surface to attach the spring is not the smartest idea.
The spring force will drive it down the slope, i.e. may contact the spring with the pipe which will be noisy and leave ugly marks.

Thanks, Martin!

I think the spring body will clear the pipe. There's also a rubber cover over the spring body to prevent damage and noise.

Image

I'm trying to make one more modification that will give me 150% more clearance. :smt023


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