OUT IN THE WORKSHOP (turning a ht into a saxaphone)

Discussion in 'Performance Mods' started by HeadSmess, Oct 30, 2010.

  1. HeadSmess

    HeadSmess Well-Known Member


    playing with my lil toy.

    first pic is the first attempt that i sorta stuffed up...

    then the next one is the success story :)

    havent actually installed yet, waiting on a new piston after having to use my spare one elsewhere... grrrr!!!!!

    last pic you can juuuuust see the reeds.... no, that isnt the intended carb mount...

    this is all by eye! i am not cnc enabled yet!

    sooooon, my precious, soooon :jester:

    Attached Files:

  2. SimpleSimon

    SimpleSimon Active Member

    I just have one question.

  3. HeadSmess

    HeadSmess Well-Known Member

    cus, unlike simpletons, i cant go home, turn on the telly and veg out.

    i have a brain, i like to use it.

    why do ppl climb everest? why do ppl get up in the morning? why do birds fly?

    why anything? why live?

    (practical reasons are because reed valves improve performance)
  4. knobb490

    knobb490 Member

    What a great piece of work! Especially by eye! What does your machine shop consist of?
  5. Nitropeewee

    Nitropeewee Member

    Yeah Yeah howd ya do it?
  6. 5-7HEAVEN

    5-7HEAVEN Guest

    Some guys talk the talk.

    Some guys walk the walk.

    Me, I just bolt readymade stuff together.


    I am humbled.:bowdown:
  7. HeadSmess

    HeadSmess Well-Known Member

    um, what have i got?

    not enough spanners and too much junk!

    two lathes, big and small, and yeah...no where near enough tools to make me happy.

    currently my mills having a breakdown so the other half of this jobs sitting in a vice, waiting... the mount for the mikuni carb.

    the mill is only small, but its very handy. also kitting it out with CNC so in a few more weeks, ill really be showing off...(my collection of destroyed cutters, :lol: )
  8. Whiplash

    Whiplash New Member

    Ohh OOh! MORE! I want to see the results!
  9. SimpleSimon

    SimpleSimon Active Member

    Other than the first 4 lines above being unnecessary, thanks for your reply. I asked why, because I wanted to know why. I'm no small engine mechanic, or any kind of expert as regards any engine at all, and I figured there was some practical reason for your efforts. I'm also always interested in learning new things, so I tend to ask questions.

    Oh, and by the way - I don't watch television except in the doctors office in hyperbaric treatment - they won't let me take a book in with me.
  10. HeadSmess

    HeadSmess Well-Known Member

    ok, ok, just that i have issues being asked that question :p sorry. it seemed like you were being smart....

    if you want to leeeearn though....

    reed valves are fited to most high performance two strokes, as it is the easiest and most reliable way of increasing crankcase compression/intake timing.

    the options are piston ported. (most cheap 2 strokes, as its, well...cheap... but ineffecient)
    reed valves. so simple. a flap and a hole makes a one way valve :) cox .049 to a cr500 use em with proven success...
    disc/ drum induction. was used on various motorcycles, and usually the drum version is seen on RC marine engines... hard to seal. biggest issue. seal and wear.
    crankshaft induction. standard on rc cars/planes.

    why the interest in induction timing?

    the longer you can keep it open means the more air/fuel gets in.

    problem that piston porting has is that while the port is open and sucking in on the upstroke, its also open and blowing back out for the same amount of time on the downstroke. sheer momentum of air keeps it travelling the right way...in.

    the longer you can keep the port closed on the downstroke, means more air/fuel is forced into the combustion chamber when the transfer ports open.

    more air/fuel means only one thing.

    more get up n go :D

    and as for "why?" being taken the other way....i ask myself that tooo :p tis why i had such a good reply :D

    (ps, what are they scared the book will do?)
  11. SimpleSimon

    SimpleSimon Active Member


    I am required to wear pure cotton surgical scrubs and nothing else in the hyperbaric tube, plus my body is physically grounded to the frame of the tube to avoid any chance of a static spark. The tube is pressurized with pure oxygen to 2.5 atmospheres, and I stay in there for 2 hours daily. Anything hand held that might generate a static spark is to be avoided in such conditions.

    I have a large, open wound on my right heel that has been making little to no progress toward healing, and the hyperbaric therapy is intended to promote that healing by elevating blood and tissue oxygen levels. It does seem to be helping, but not quickly.

    Diabetes sucks.
  12. schulze 123

    schulze 123 Member

    Just chiming in to see if you had made any further progress on your reeded barrel as I'm currently doing a similar mod to my barrel. I'm using the reed block and Walbro carby off a DLE 50cc model aero engine, should be interesting.

    Cheers BJ
  13. keatonx

    keatonx Member

    Did you add reeds? if so, can i do this to my old crappy 19cc engine with a grinder, drill, sawzall, etc.?
  14. schulze 123

    schulze 123 Member

    Did I use the reeds as well as the block? Yes. Can you do this mod to your 19cc motor? send me some pictures of it and I will let you know involved or what special tools (if any) are required.

    Cheers BJ
  15. HeadSmess

    HeadSmess Well-Known Member

    ok, ok, refresh...

    i been AWOL setting up my mill to CNC...learning to use it :) cheating by seeing another forum :eek:
    theres this funky thing called "go to zero". if you forget to lift the drill out of the hole before hitting the button....one needs a new drill :eek: still keep forgetting...


    lastnight i got in the mood to mess with alloy again... i stopped at 230 am finally. so, the progress up to now :) sorta looks good so far. this is the block to take the carby, with recess for reed valves... gotta flip over still.

    soz, cam phone.... still doesnt stop the urge to try and blow that swarf off!

    Attached Files:

  16. HeadSmess

    HeadSmess Well-Known Member

    just a lil bit more....now i need a new piston and um...some sorta manifold for that carb still.... back to the scrap heap :)

    you can tell its been a while cus its been decided the cylinder will make a good nursery by some maternal mudwasp...

    my only concern is flow through this thing... i may be doing version2.1 with twin reeds at an angle like they do on real 2strokes... meh. i was using the alu i had handy...

    Attached Files:

  17. schulze 123

    schulze 123 Member

    Hi Troops,
    Just a few pictures of the progress I have made. I think just a few minutes work with a nail file should see it finished (I wish).

    Cheers BJ

    Attached Files:

  18. HeadSmess

    HeadSmess Well-Known Member

    oooooh, very nice :) thems be the type of reeds i want.... :'( gimmmmmeeee!
  19. a/c man

    a/c man Member

    Schulze 123,
    Where will you be tapping the pulse tube on that Walbro carb?
    Also what size is that carb, I've always wanted to put a Walbro or Zama on mine.
    Last edited: Feb 1, 2011
  20. HeadSmess

    HeadSmess Well-Known Member

    i believe thats the yellow line there....seems to run from the black manifold at least.... its an external pulse feed carbie. out of twenty or more ive only got one of these...

    this raises an interesting point...

    schulze, remember the pulse needs to be from the crankcase side of the reeds... not the carb side. it needs POSITIVE pressure.... youre possibly better off blocking the hole in the manifold and tapping a hole into the crankcase itself? or into the manifold youre making there...
    Last edited: Feb 1, 2011