How Are These Pipes Made?

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Jeff B
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Re: How Are These Pipes Made?

#211 Post by Jeff B » Fri Nov 09, 2018 3:29 pm

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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Re: How Are These Pipes Made?

#212 Post by Smoker » Sat Nov 10, 2018 2:22 pm

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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Re: How Are These Pipes Made?

#213 Post by MK » Sat Nov 10, 2018 4:38 pm

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" onclick="window.open(this.href);return false;

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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Martin

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Re: How Are These Pipes Made?

#214 Post by Smoker » Sat Nov 10, 2018 5:07 pm

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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Re: How Are These Pipes Made?

#215 Post by Smoker » Mon Nov 12, 2018 7:53 pm

Getting there with my spring hook design.
Thought you might like a peek.

Image

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Re: How Are These Pipes Made?

#216 Post by silverstrom » Tue Nov 13, 2018 12:09 am

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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Re: How Are These Pipes Made?

#217 Post by MK » Tue Nov 13, 2018 2:22 pm

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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Martin

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Re: How Are These Pipes Made?

#218 Post by Smoker » Wed Nov 14, 2018 7:37 am

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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Re: How Are These Pipes Made?

#219 Post by Smoker » Sun Dec 09, 2018 2:28 pm

I knew about back purging argon for welding titanium, but didn't know it should be done for stainless steel.

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Re: How Are These Pipes Made?

#220 Post by Smoker » Sun Dec 09, 2018 5:08 pm

Pipe question:

If I remove the silencers from my aftermarket pipes, and bolt on straight pipes (same length as the silencers)....

Do you think the carbs will need rejetting? :smt017

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Re: How Are These Pipes Made?

#221 Post by Jeff B » Sun Dec 09, 2018 11:53 pm

Technically, I believe the straight pipe before the silencer is supposed to be the most restrictive part of the exhaust system. The silencer is supposed to do a little for performance, but I don't really understand it. Removing it would probably have minimal effect on jetting. You didn't specify what diameter tube you'd replace it with. If it's the same diameter as the tube you are mounting it to it could increase restriction. If it's a little larger, then virtually no effect on jetting vs. no silencer at all. I'm no expert, but I'd try it while paying close attention to how it runs.

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Re: How Are These Pipes Made?

#222 Post by MK » Mon Dec 10, 2018 9:44 am

You could get away without purging on stainless but at the cost of reduced durability (backside will have that cauliflower look which induces cracking under vibration).
Second issue is heat. Using backpurge the bead runs much cooler, shows less annealing colors and has less risk of burning those ugly holes that you can partly see from tacking.
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Martin

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Re: How Are These Pipes Made?

#223 Post by Smoker » Thu Dec 13, 2018 8:44 pm

First 2 sections:

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Last edited by Smoker on Fri Jan 14, 2022 7:59 am, edited 1 time in total.

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Re: How Are These Pipes Made?

#224 Post by lost1750GTV » Thu Dec 13, 2018 9:08 pm

oh, that is coming along nicely.

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Re: How Are These Pipes Made?

#225 Post by Smoker » Tue Dec 18, 2018 4:32 pm

MK wrote: Tue Nov 13, 2018 2:22 pm 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.
In this photo, you can see how I built up the floor of the triangle cutout. That should limit how far the spring can move toward the pipes.

Image

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