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Expansion chambers plans / drgs

Posted: Wed Jun 13, 2018 7:00 pm
by 1601pete
Evening all.

I’m looking to make my own expansion chambers. I have access to material, a laser cutter and welding equipment.....and I’m up for a challenge.

My question is does anybody have details / plans to enable me to cut the pieces, form and weld?

I guess I’m looking to replicate the lomas pipes (side by side).

It won’t be easy, but I want to take it on as a bit of a project .

Thanks

Re: Expansion chambers plans / drgs

Posted: Thu Jun 14, 2018 1:25 am
by smokamoto
The Yamaha TSI specs are posted on this site. They include pipe specs.
Quite an ambitious project - I wish you success.
Please keep us posted on your progress.

Re: Expansion chambers plans / drgs

Posted: Thu Jun 14, 2018 1:27 am
by smokamoto
Here’s the link
http://www.rzrd500.com/500tsi/" onclick="window.open(this.href);return false;

Re: Expansion chambers plans / drgs

Posted: Thu Jun 14, 2018 1:31 am
by smokamoto
Others please chime in - I suspect that those pipe specs would work best if you did the rest of the TSI mods. And from what I can recall the mods result in not the most suitable streetbike?
Others please comment as I have no personal experience with doing the full TSI mods.

Re: Expansion chambers plans / drgs

Posted: Thu Jun 14, 2018 2:37 am
by 1601pete
Thanks I saw that before.

I guess I was hoping (being lazy) for the “net” shape sizes of all the various cones to get the right lengths and bend angles etc...

Thanks

Re: Expansion chambers plans / drgs

Posted: Thu Jun 14, 2018 11:17 am
by ns86
I think MK had a good post on pipe building techniques if I could only find it!

Re: Expansion chambers plans / drgs

Posted: Thu Jun 14, 2018 2:55 pm
by MK
Can be found on rd350.gmxhome.de or directly:
http://l3s9113.zeus09.de/RD350/Auspuffb ... glisch.pdf" onclick="window.open(this.href);return false;

Re: Expansion chambers plans / drgs

Posted: Thu Jun 14, 2018 3:00 pm
by 1601pete
That’s an excellent bit of info. Thanks ?

Re: Expansion chambers plans / drgs

Posted: Fri Jun 15, 2018 3:01 am
by vdrive
smokamoto wrote:Others please chime in - I suspect that those pipe specs would work best if you did the rest of the TSI mods. And from what I can recall the mods result in not the most suitable streetbike?
Others please comment as I have no personal experience with doing the full TSI mods.
I went to ask Bassani in Aneheim California to get TSI Expansion Chambers made , was told need 25 sets Minimum order (steel pipes & aluminum silencers ) at $ 1000.00 each set , ( keep 5 sets for myself ) . couldn't find any one else who wanted a set after going to bike nights all over in California .......

Re: Expansion chambers plans / drgs

Posted: Mon Jun 18, 2018 10:10 am
by Mike Cichetti
My buddy would be in for a set.

Re: Expansion chambers plans / drgs

Posted: Wed Jun 20, 2018 3:40 am
by vdrive
Mike Cichetti wrote:My buddy would be in for a set.
well only need 24 more people ........

Re: Expansion chambers plans / drgs

Posted: Wed Jun 20, 2018 8:53 am
by lost1750GTV
stock or gp style?
assuming they save a bunch of weight, etc, yeah I'm in.

Re: Expansion chambers plans / drgs

Posted: Thu Jun 21, 2018 8:53 pm
by BigGuy
This sounds interesting!

Re: Expansion chambers plans / drgs

Posted: Fri Jun 22, 2018 6:27 am
by vdrive
lost1750GTV wrote:stock or gp style?
assuming they save a bunch of weight, etc, yeah I'm in.
stock , needed to drop my bike off for them to do fitment under stock bodywork.

Re: Expansion chambers plans / drgs

Posted: Fri Jun 22, 2018 3:52 pm
by MK
You could try this guy:
http://www.npowerperformance.com" onclick="window.open(this.href);return false;

He does custom pipes for a living and I guess starting from a batch of one instead of 25.
Currently he's a bit busy but if you have a bit of time, it should be doable.
Edit: Correct form is "has been done"
Image

If anyone knows the BRC 500 project where they offer a 500 cc kit for the KTM300: Neil is doing the pipes for that kit.