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Constructing a expansion chamber

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  • #1

    [Photo Feature]: Constructing a expansion chamber

    hi 2strokes ....
    i always wanted a expansion chamber for my rx 135 4 speed.. then i thought y not construct my own performance pipe ..k any ways i started googeline it and i found so many web sites .. but two books () gave me the info needed.In book Two Stroke Performance Tuning by Graham Bell the author said "this dosen't imply that the first exhaust you fabricate will be perfect. The japanesr manufacturers, and in particular YAMAHA and SUZUKI, know as much as anyone about exhaust tuning, but you will find they are constantly updating the expansion chambers on both their works and in production races, proving they are still looking for the best design" keeping that in mind i thought i'll start with simple single stage expansion chamber for now.
    I have taken some measurements and done some calculation according to the formula given in the books ( all unites r in inches )
    input valuesoutput values:
    1. Lt= 34
    2. D1= 1.2
    3. D2= 3
    4. D3= 0.744
    5. L3= 12
    6. L7= 8.928
    7. L2= 12.216
    8. L1= 27.9
    9. L4= 12.87
    10. L5= 3.03
    11. L6= 9.186
    some definition
    in calculating D2 6.25 is the outlet/inlet ratio constant,in D3 i used 0.62
    and in L3 i used 10

    i coud't find a way to type the formula ... so i posted them as images .. i made a chart paper model before going real-time it's looking good ..
    guys this is my first attempt .. if any one have done this before r made such attempts pls guide me .. and all 2strokes pls share u r thoughts .. cheers...
    Tags: None
  • #2
    Topic approved.
    (Been There Done That) x 3.25

    Comment

    • #3
      Interesting and all the best for your first build. If every thing goes well (performance), I will order you a pipe for my friend's rx-135.

      Keep us posted!
      '98 Shogun

      '91 RX100

      Comment

      • #4
        Right approach used. What simulator are you using to make the pipe? I remember RKOLI83 (motorhead) had done a similar project when we made our first set of pipes. How do you intend on making the tapered headers? I get my chamber sections plotted in AUTOCAD and get them laser cut. That way u have lesser variation and error in tuned length. Dont weld the whole chamber unless u mount the first half (header, then diffuser, then belly and then convergent cone, stinger and then end can) so your chamber routes properly

        I normally don't show pics of my chamber building process. Here's a few pics for you.

        Cheers
        Last edited by atul_astro; 08-19-2010, 03:23 PM.
        83' RD350 HT
        96' RXG
        97' RXZ
        91'RX100>09'RX165
        2010' HH ZMR

        Comment

        • #5
          nice job buddy....if havent found this yet ,you can use this simulator to try out and fine tune the design , MOTA Two Stroke Engine Simulation Software (follow the link and click on the blue download link in the third para)
          Kawasaki KB100/enduro/125 substitute parts list http://www.xbhp.com/talkies/508615-post105.html

          Comment

          • #6
            great going... all the best for the effort mate!!!


            My offerings to the gods of speed -

            - KTM Duke 200
            - Yamaha RXZ 5 speed


            Comment

            • #7
              Originally posted by atul_astro View Post
              Right approach used. What simulator are you using to make the pipe? I remember RKOLI83 (motorhead) had done a similar project when we made our first set of pipes. How do you intend on making the tapered headers? I get my chamber sections plotted in AUTOCAD and get them laser cut. That way u have lesser variation and error in tuned length. Dont weld the whole chamber unless u mount the first half (header, then diffuser, then belly and then convergent cone, stinger and then end can) so your chamber routes properly

              I normally don't show pics of my chamber building process. Here's a few pics for you.

              Cheers
              Pure rocket launchers Atul.
              '98 Shogun

              '91 RX100

              Comment

              • #8
                Originally posted by atul_astro View Post
                Right approach used. What simulator are you using to make the pipe? I remember RKOLI83 (motorhead) had done a similar project when we made our first set of pipes. How do you intend on making the tapered headers? I get my chamber sections plotted in AUTOCAD and get them laser cut. That way u have lesser variation and error in tuned length. Dont weld the whole chamber unless u mount the first half (header, then diffuser, then belly and then convergent cone, stinger and then end can) so your chamber routes properly

                I normally don't show pics of my chamber building process. Here's a few pics for you.

                Cheers
                Awesomeo! Drooling with those pics man!
                Super CommuTOURerïż½ - Talk less, Ride more

                .: FB :.|.: TW :.|*IG*| Ex                 PowerDrift:.

                #Give thy opinion, write em, dont throw em
                #Everyone errs, accept it, defending/cribbing about it only makes it worse
                #Dont defend a manufacturer as if you work for them
                #Write. Think. If relevant hit submit. If not hit yourself
                #Be kind in your choice of words, you never know who would make you gulp em
                ïż½ Satyen Poojary

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                • #9
                  i always wanted to build a pipe but couldnt do it
                  this is quite an inspiration to start doing it

                  Comment

                  • #10

                    I normally don't show pics of my chamber building process. Here's a few pics for you.
                    Cheers
                    you are an artist bro....
                    everytime i see your posts , i plan to bring a rusting piece of Rx to life(i do have one),may be one day i will be able to...
                    but must admit nice work there...
                    Regards..

                    Comment

                    • #11
                      Pure rocket launchers Atul.
                      lol..thanks man..thats a compliment .

                      Awesomeo! Drooling with those pics man!
                      ahaha..get a stroker satya..and get it asap..then we can put one of these one your bike too it'll be a crazy change from your 4 strokes

                      you are an artist bro....
                      everytime i see your posts , i plan to bring a rusting piece of Rx to life(i do have one),may be one day i will be able to...
                      but must admit nice work there...
                      Regards..
                      im humbled by your compliment sir im really glad my posts evoke such a good emotion. Thanks all for your kind words guys, it really works as the best motivator. I promise to stay dedicated to the 2 stroke cause and get something more each time. Its an awesome learning curve so far. We all have a long way to go

                      Regards

                      Atul H

                      @insane - start your rebuild whenever u can man. Im sure you'll make a crazy smoking cracker out of that bike.
                      83' RD350 HT
                      96' RXG
                      97' RXZ
                      91'RX100>09'RX165
                      2010' HH ZMR

                      Comment

                      • #12
                        thanks for the approval.. and thanks for the feed back guys ..
                        atul_astro
                        thanks for the pics man really appreciate that ... like u r cones man really great job.. i dint use any simulator i did the calculation my self .. i know Engineering drawing some wat.., did paper model with that .. for header i thought i'll get a pipe and bend it or i'll use the normal rx exhaust header... give me u r opinion atul ...
                        Originally posted by atul_astro View Post
                        I get my chamber sections plotted in AUTOCAD and get them laser cut. That way u have lesser variation and error in tuned length.
                        wow AUTOCAD and laser cutting .. Well i dont know autocad ... laser cutting is not available in my place .. i dont think i can match up to u r precision .. i'll try my best with wat i can get ..

                        kb100
                        Thanks for the link man loved it .. it simulates 2 stage and 3 stage pipes..
                        little bit complex though ... need to learn more and have some experience before i go for 2 or 3 stage pipes i'll use it for my next projects
                        CHEERS.......

                        Comment

                        • #13
                          Originally posted by nikhils View Post
                          i always wanted to build a pipe but couldnt do it
                          this is quite an inspiration to start doing it
                          dont wait go for it... coz thats when the magic happens

                          Comment

                          • #14
                            No dont use the stock bend pipe what to use the experts will pump in ..
                            "Engine tuning is not an exact science, but with some practice and patience you'll get comfortable with your skill and be able tune for any conditions mother nature throws at you"


                            Still the Boss -- RX 135

                            Comment

                            • #15
                              great going best of luck for u r job .can u try to make little bit stylist expansion

                              Comment

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