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Q: 2-stroke expansion chambers.

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SloCalSpode

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Aug 27, 2009, 8:34:39 PM8/27/09
to
After a mild Google search looking for who/whom makes
custom 2-stroke expansion chambers. I've pretty much
come up empty.
I bow to the collective knowledge resource of RMD to
help me find a USA maker of said pipes.
I am curious how much $,$$$.$$ it would cost to have
a new pipe made for my newly purchaed SDR200 Yamaha.
SloCalSpode

sturd

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Aug 28, 2009, 8:15:39 AM8/28/09
to
SloCalSpode asks:


> After a mild Google search looking for who/whom makes
>  custom 2-stroke expansion chambers. I've pretty much
>  come up empty.

I'll be surprised if you find one that you don't have
to design/build yourself. Maybe if you look in
Europe or Japan where maybe they sold more of
them?

I *think* Jemco used to make pipe parts but can't
prove it now. There was somebody that did and I thought
they were in Utah or about. Found these guys
http://www.coneeng.com/conical_products.html
While that's not the company I am trying to remember,
looks like they could sell you the parts if you have
a design.

It's not all that hard if you can weld. I tried it exactly
once and it sort of worked. A "pipe" inside a stock
RD400 muffler to get around a stock appearing rule.


Go fast. Take chances.
Mike S.

john

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Aug 28, 2009, 8:21:42 AM8/28/09
to
http://www.bevenyoung.com.au/mota.htm
look into the kart racing folks because the take
2stroke bike engines and then have to build
a pipe to fit..

john


"sturd" <mikestur...@hotmail.com> wrote in message
news:331378c3-18e4-422c...@o32g2000yqm.googlegroups.com...

dsc-ky

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Aug 28, 2009, 10:45:47 AM8/28/09
to

Can you just take 3 or 4 old pipes, cut/weld/fabricate and come up
with something that works pretty well?
Assuming you know about what it should look like or have somethign to
go by?

jayc

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Aug 28, 2009, 11:09:37 AM8/28/09
to
On Aug 27, 8:34 pm, SloCalSpode <jjwall...@earthlink.net> wrote:

You may want to call one of the companies that repairs pipes. I don't
know of any specific names, but some of the more 2-stink-experienced
around probably do. You can send them your old one and (with any luck
at all) get something back that either is, or at least looks, new.

JayC

Tim H

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Aug 28, 2009, 12:47:54 PM8/28/09
to

I don't think Jeff wants to replace a damaged pipe, he wants to hot
rod his uber-bitchin' new 200 single street bike.
I think he should, too.
That software package john gave the link to sounds really cool. If I
was, um, financially secure, I'd order it up just to play with it.
I think there's an oblique reference to Scott's High School shop
teacher in the testimonials from that, when some Canadian guy mentions
his work being comparable to that from "one of the top tuners in the
NW USA". The dude (Mike Collins, Collins Racing Engines) has an
awesome shop in his back yard; 2 dynos, a flow bench, all the machine
tools you could want...really nice guy, too.

Tim H

Craig

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Aug 28, 2009, 12:54:26 PM8/28/09
to
On Aug 28, 8:21 am, "john" <n...@this.add> wrote:
> http://www.bevenyoung.com.au/mota.htm
> look into the kart racing folks because the take
> 2stroke bike engines and then have to build
> a pipe to fit..

Along with Kart guys, Micro Sprint guys also put 2S motors in sprint
car chassis and have to build pipes to suit. There's a local guy here
who's long been involved with building motors for the local micro
sprint crowd. Might be worth the cost of a phone call to see if he can
point you toward a solution. B&B Enterprises (302) 836-2012.

Craig

jayc

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Aug 28, 2009, 1:20:34 PM8/28/09
to
> I don't think Jeff wants to replace a damaged pipe, he wants to hot
> rod his uber-bitchin' new 200 single street bike.
> I think he should, too.

Oh. In that case, I agree.

Help save the ozone layer - put in a N2O injection system.

JayC

john

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Aug 28, 2009, 1:40:08 PM8/28/09
to
2stroke wizard is 36 bucks
if that's to expensive for your budget...
http://microcarproject.tripod.com/html/expansion_chamber_design_softwar.htm
spend a few hours working that out...

last pipe i built was in 82 for a puch...
thin wall welding it an art, which i ended up
becoming a better grinder than a welder...
then i ended up brazing <grin>

i seem to remember some folks doing some nice
work on mopeds for the euro's that had this 50cc limit..


"Tim H" <tntha...@msn.com> wrote in message
news:612d8d90-d37c-4fb2...@d9g2000prh.googlegroups.com...

SloCalSpode

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Aug 28, 2009, 2:49:29 PM8/28/09
to
TimH is correct. I was thinking about some sweet looking
custom pipe. You know the type. With the little cone
sections welded together like precision art.
Take a look at the stock pipe.
http://s288.photobucket.com/albums/ll172/SloCalSpode/sdr200/
To duplicate that would take the work of an artist for sure.
I may be able to find one "aftermarket" from Japan. I just
need to learn how to read Japanese.....
Jeff
------------------------------------------------------------

Tim H wrote:
> I don't think Jeff wants to replace a damaged pipe, he wants to hot
> rod his uber-bitchin' new 200 single street bike.
> I think he should, too.

> Tim H

SloCalSpode

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Aug 28, 2009, 2:53:40 PM8/28/09
to
Forgot to mention. The black bike with the red wheels is mine.
The green one and the other black one are pictures I found
of bikes in Europe. The green one already has a custom or
aftermarket pipe on it.
The stocker looks like it is all one welded piece. It does
not look like you can replace the packing or replace
the silencer with another "slip-on" type.
It should be in my sweaty little hands by the end of next
week.....I can't wait.
Jeff

R E

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Aug 28, 2009, 2:57:00 PM8/28/09
to

"john" <n...@this.add> skrev i meddelandet
news:3EUlm.623443$Xo1.3...@en-nntp-07.dc1.easynews.com...

> 2stroke wizard is 36 bucks
> if that's to expensive for your budget...
> http://microcarproject.tripod.com/html/expansion_chamber_design_softwar.htm
> spend a few hours working that out...
>
> last pipe i built was in 82 for a puch...
> thin wall welding it an art, which i ended up
> becoming a better grinder than a welder...
> then i ended up brazing <grin>
>
> i seem to remember some folks doing some nice
> work on mopeds for the euro's that had this 50cc limit..
>

Try snowmobile performance shop`s like:
http://www.jawsperformance.com/
http://www.bikemanperformance.com/
http://www.hiperf.com/
http://www.dynoport.com/
http://www.thecrankshopvt.com/

These guys/girls now what there doin, they do custom pipes to racebikes and
snowmobiles.

/Roger


__________ Information from ESET NOD32 Antivirus, version of virus signature database 4378 (20090828) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

R E

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Aug 28, 2009, 3:00:42 PM8/28/09
to

"SloCalSpode" <jjwa...@earthlink.net> skrev i meddelandet
news:b5657bde-3522-46e4...@k13g2000prh.googlegroups.com...
And you might wanna talk to this guy, he might point you in the right
direction: http://www.thetuningworks.com/

check out the pipes on the bikes at the page, especially the Kawasaki KR1

R E

unread,
Aug 28, 2009, 3:01:31 PM8/28/09
to

"SloCalSpode" <jjwa...@earthlink.net> skrev i meddelandet
news:b5657bde-3522-46e4...@k13g2000prh.googlegroups.com...
Here`s the Kawi KR1
http://thetuningworks.com/shop/product_info.php?products_id=467

SloCalSpode

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Aug 28, 2009, 4:57:04 PM8/28/09
to
---------------------------------------------------------------------
Who was it that said, "Bad azz!" Yea, that's what Im
talking about.
Seems these folks are in the UK though.
I am sure someone here state side does the
same type of work.
Maybe I am getting ahead of myself, I still don't have
the bike in hand. But this is along the path I may
eventually take. Dollars permitting......
$1,200-$1,500 for a pipe would blow me right out of the
water into fantasy land.
Jeff.

Wudsracer

unread,
Aug 31, 2009, 3:29:15 AM8/31/09
to
Jeff,
There is a shop in Houston that builds custom expansion chambers
for two stroke bikes. (dirt bikes, anyway) The prices I heard were
better than some of the US made aftermarket pipes you see in the
magazines.

Jim

**********************************************************************************************8

************************************************************


Wudsracer/Jim Cook
Smackover Racing
'06 Gas Gas DE300
'82 Husqvarna XC250
Team LAGNAF

Dean H

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Aug 31, 2009, 8:18:39 AM8/31/09
to
> The green one already has a custom or
>  aftermarket pipe on it.

That pipe on the green one is just lovely, sexy even. The flat black
finish looks great on that shape.

Now that I look, the black pipe might be right for the bike's shape
too.
That's a very cool bike, dude.

daaaaamn

SloCalSpode

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Aug 31, 2009, 2:40:54 PM8/31/09
to
Update! The bike just left Florida on a truck this morning.
Should be here in 5-7 days. WhooHoo.
BTW. I did find a Japanese Co. that makes an aftermarket pipe
for the SDR200. A co. called SP Tadao.
http://www.sptadao.co.jp/muffler/bigbike/sdr200/index.html
Only $616.00 US before shipping......doh!
Jeff
Dean H wrote:
<SNIP>

SloCalSpode

unread,
Sep 3, 2009, 8:45:46 PM9/3/09
to

sturd

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Sep 4, 2009, 8:25:56 AM9/4/09
to
SloCalSpode points to:

>  I may have found my man!
> http://highwaymanpipes.com/

Nice A7. Cool stuff, good luck.

David Kelly

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Sep 8, 2009, 3:29:17 PM9/8/09
to
Tim H wrote:
>
> That software package john gave the link to sounds really cool. If I
> was, um, financially secure, I'd order it up just to play with it.

You didn't read the full page at the provided link, to the point where
they say:

> We now have a simple 2 stroke expansion chamber design program. FREE
> download here This program is not a part of MOTA, but it has been
> put together by the same engineers as a starting point for those
> wishing to begin from scratch. It calculates the dimensions for both
> double and triple stage diffuser expansion chambers from a few basic
> engine dimensions. The information used in the program's
> calculations was taken from the books �The Basic Design of the Two
> Stroke Engine� and the book �Design and Simulation of Two Stroke
> Engines�; both books are written by Professor G.P. Blair of Queens
> University Belfast, and published by the Society of Automotive
> Engineers. You are well advised to read at least one of the books
> mentioned above, since they contain the author�s academic lifetime of
> knowledge on the two-stroke engine. There are several coefficients
> used in the design of the expansion chamber � these are a function of
> the engine�s state of tune. Those used in this program have been
> chosen for petrol engines, and are in the range 50cc up to about
> 500cc per cylinder. It is doubtful these formulae would work on small
> capacity glowplug engines, since the exhaust gas temperature is much
> lower, and the engine speed is much higher.

The free expansion chamber code:
http://www.bevenyoung.com.au/pipe_dsn.zip

Tim H

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Sep 9, 2009, 10:39:09 AM9/9/09
to
On Sep 8, 12:29 pm, David Kelly <n4...@Yahoo.com> wrote:
> Tim H wrote:
>
> > That software package john gave the link to sounds really cool. If I
> > was, um, financially secure, I'd order it up just to play with it.
>
> You didn't read the full page at the provided link, to the point where
> they say:
>
>
>
>
>
> > We now have a simple 2 stroke expansion chamber design program. FREE
> > download here This program is not a part of MOTA,  but it has been
> > put together by the same engineers as a starting point for those
> > wishing to begin from scratch.  It calculates the dimensions for both
> > double and triple stage diffuser expansion chambers from a few basic
> > engine dimensions.  The information used in the program's
> > calculations was taken from the books ‘The Basic Design of the Two
> > Stroke Engine’ and the book ‘Design and Simulation of Two Stroke
> > Engines’; both books are written by Professor G.P. Blair of Queens

> > University Belfast, and published by the Society of Automotive
> > Engineers.  You are well advised to read at least one of the books
> > mentioned above, since they contain the author’s academic lifetime of

> > knowledge on the two-stroke engine. There are several coefficients
> > used in the design of the expansion chamber – these are a function of
> > the engine’s state of tune. Those used in this program  have been

> > chosen for petrol engines, and are in the range 50cc up to about
> > 500cc per cylinder. It is doubtful these formulae would work on small
> > capacity glowplug engines, since the exhaust gas temperature is much
> > lower, and the engine speed is much higher.
>
> The free expansion chamber code:http://www.bevenyoung.com.au/pipe_dsn.zip- Hide quoted text -
>
> - Show quoted text -

Yeah, I saw that. I liked the full program's ability to model port
height and angle changes and other internal engine mods, too. Still,
it might be fun to play with the pipe-only program.
Just as soon as I have some extra time on my hands. Should happen just
about the time they perfect cold fusion.

Tim H

SloCalSpode

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Sep 9, 2009, 4:11:24 PM9/9/09
to
I'll start working on that Cold Fusion problem
if you'd spend a little time figuring out that
pipe design software.
--------------------------
I got the bike today!! WhooHoo! She is a beauty
indeed.
The GasGas may be the Spanish dancing princess, but,
this little bike surely is the equivalent Asian
Princess. Tiny bound feet and all. She is so delicate
and fragile looking. Like a tiny lotus flower ready
to bloom.
I am going to feel like the Barbarian from the east
trying to steal the Emperors' daughter when I take her
for a ride. I promise I will be gentle.......
She will need a little pampering. A bath and some perfume.
She smells like 2 year old gas with a splash of pre-mix.
Plus a new pair of shoes. I might as well strip her
nekid and find all her faults first. Before putting her
in some new clothes and fresh fluids.
I'll try and get some photos and post a link. If anyone
is interested.
Thanks for all your suggestions. I appreciate it a lot.
Cheers, Jeff
----------------------------------------------------------
Tim H wrote:
<SNIP>

KW

unread,
Sep 9, 2009, 4:40:23 PM9/9/09
to

"SloCalSpode" <jjwa...@earthlink.net> wrote in message
news:b52c9b7b-d505-4705...@z3g2000prd.googlegroups.com...

Chalk one up in the interested column!

KW


HardWorkingDog

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Sep 9, 2009, 6:52:32 PM9/9/09
to
In article
<b52c9b7b-d505-4705...@z3g2000prd.googlegroups.com>,
SloCalSpode <jjwa...@earthlink.net> wrote:

> I might as well strip her
> nekid and find all her faults first. Before putting her
> in some new clothes and fresh fluids.

sounds like it's, a, been awhile...

--
Charles
'99 YZ250

JustWaitAFrekinMinute!

unread,
Sep 13, 2009, 11:22:55 PM9/13/09
to
On Sep 8, 3:29 pm, David Kelly <n4...@Yahoo.com> wrote:
> Tim H wrote:
>
> > That software package john gave the link to sounds really cool. If I
> > was, um, financially secure, I'd order it up just to play with it.
>
> You didn't read the full page at the provided link, to the point where
> they say:
>
>
>
>
>
> > We now have a simple 2 stroke expansion chamber design program. FREE
> > download here This program is not a part of MOTA,  but it has been
> > put together by the same engineers as a starting point for those
> > wishing to begin from scratch.  It calculates the dimensions for both
> > double and triple stage diffuser expansion chambers from a few basic
> > engine dimensions.  The information used in the program's
> > calculations was taken from the books ‘The Basic Design of the Two
> > Stroke Engine’ and the book ‘Design and Simulation of Two Stroke
> > Engines’; both books are written by Professor G.P. Blair of Queens

> > University Belfast, and published by the Society of Automotive
> > Engineers.  You are well advised to read at least one of the books
> > mentioned above, since they contain the author’s academic lifetime of

> > knowledge on the two-stroke engine. There are several coefficients
> > used in the design of the expansion chamber – these are a function of
> > the engine’s state of tune. Those used in this program  have been

> > chosen for petrol engines, and are in the range 50cc up to about
> > 500cc per cylinder. It is doubtful these formulae would work on small
> > capacity glowplug engines, since the exhaust gas temperature is much
> > lower, and the engine speed is much higher.
>
> The free expansion chamber code:http://www.bevenyoung.com.au/pipe_dsn.zip- Hide quoted text -
>
> - Show quoted text -

I am having trouble opening the setup.exe file up after I unzip it.
Any suggestions?

RMR...

JustWait

unread,
Sep 14, 2009, 12:44:36 PM9/14/09
to
In article <dadb1214-d644-4e83-aace-4adc5ba48ea1
@s39g2000yqj.googlegroups.com>, justwaitaf...@gmail.com says...

>
> On Sep 8, 3:29 pm, David Kelly <n4...@Yahoo.com> wrote:
> > Tim H wrote:
> >
> > > That software package john gave the link to sounds really cool. If I
> > > was, um, financially secure, I'd order it up just to play with it.
> >
> > You didn't read the full page at the provided link, to the point where
> > they say:
> >
> >
> >
> >
> >
> > > We now have a simple 2 stroke expansion chamber design program. FREE
> > > download here This program is not a part of MOTA,  but it has been
> > > put together by the same engineers as a starting point for those
> > > wishing to begin from scratch.  It calculates the dimensions for both
> > > double and triple stage diffuser expansion chambers from a few basic
> > > engine dimensions.  The information used in the program's
> > > calculations was taken from the books ?The Basic Design of the Two
> > > Stroke Engine? and the book ?Design and Simulation of Two Stroke
> > > Engines?; both books are written by Professor G.P. Blair of Queens

> > > University Belfast, and published by the Society of Automotive
> > > Engineers.  You are well advised to read at least one of the books
> > > mentioned above, since they contain the author?s academic lifetime of

> > > knowledge on the two-stroke engine. There are several coefficients
> > > used in the design of the expansion chamber ? these are a function of
> > > the engine?s state of tune. Those used in this program  have been

> > > chosen for petrol engines, and are in the range 50cc up to about
> > > 500cc per cylinder. It is doubtful these formulae would work on small
> > > capacity glowplug engines, since the exhaust gas temperature is much
> > > lower, and the engine speed is much higher.
> >
> > The free expansion chamber code:http://www.bevenyoung.com.au/pipe_dsn.zip- Hide quoted text -
> >
> > - Show quoted text -
>
> I am having trouble opening the setup.exe file up after I unzip it.
> Any suggestions?
>
> RMR...

Now the link seems to have disappeared. I have a friend who is very
interested in taking a look at the file but we can't get the setup to
open. Has anybody else opened it up running Vista? Thanks.

If someone has a working setup file and supporting files, can you please
forward them to my " scotty at smallboats remove all but the dot
com " if you could please...


Rowdy Mouse Racing, Get better soon Katie, Suzuki #271, NEMA.

--
Wafa free since 2009

David Kelly

unread,
Sep 14, 2009, 2:24:25 PM9/14/09
to
JustWait wrote:

>> I am having trouble opening the setup.exe file up after I unzip it.
>> Any suggestions?
>>
>> RMR...
>
> Now the link seems to have disappeared. I have a friend who is very
> interested in taking a look at the file but we can't get the setup to
> open. Has anybody else opened it up running Vista? Thanks.

The link is still there, or has been restored,
http://www.bevenyoung.com.au/pipe_dsn.zip

The SETUP.EXE file dates from 1998 but the .CAB file is dated 2005.
"Cabinet Files" first appeared in XP but not 2000 so I suspect this .CAB
file is not a Microsoft Cabinet File. If it is, then it is corrupt. That
perhaps the matching SETUP.EXE is supposed to know how to read the
provided .CAB file.

Stuffit Expander thinks it knows .CAB archive format. It tries to create
a Pipe_Dsn.exe but fails on format error.

john

unread,
Sep 14, 2009, 3:55:42 PM9/14/09
to
http://web.archive.org/web/*/http://www.bevenyoung.com.au

might help you find older versions


"David Kelly" <n4...@Yahoo.com> wrote in message
news:_9mdnZOikOfEFzPX...@posted.hiwaay2...

The Real Bev

unread,
Sep 16, 2009, 1:12:47 AM9/16/09
to
David Kelly wrote:

> JustWait wrote:
>
>>> I am having trouble opening the setup.exe file up after I unzip it.
>>> Any suggestions?
>>>
>>> RMR...
>>
>> Now the link seems to have disappeared. I have a friend who is very
>> interested in taking a look at the file but we can't get the setup to
>> open. Has anybody else opened it up running Vista? Thanks.
>
> The link is still there, or has been restored,
> http://www.bevenyoung.com.au/pipe_dsn.zip
>
> The SETUP.EXE file dates from 1998 but the .CAB file is dated 2005.
> "Cabinet Files" first appeared in XP but not 2000 so I suspect this .CAB

Huh? I remember getting cabview in the M$ powertoys for win98 or 2000 -- it
annoyed me that the files were dumped into the .cabs in what appeared to be
random order, and you just had to dig down through the pile until you found
what you wanted. If I'd needed it more than a couple of times I would have
figured out some way to index them. I haven't done anything exotic with XP --
too much trouble since I use that machine so infrequently.

> file is not a Microsoft Cabinet File. If it is, then it is corrupt. That
> perhaps the matching SETUP.EXE is supposed to know how to read the
> provided .CAB file.
>
> Stuffit Expander thinks it knows .CAB archive format. It tries to create
> a Pipe_Dsn.exe but fails on format error.

--
Cheers, Bev
====================================================================
"My parents just came back from a planet where the dominant lifeform
had no bilateral symmetry, and all I got was this stupid F-Shirt."

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