a book and a barrel

Discussion in 'Scooter Projects' started by shiny red, Mar 20, 2008.

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  1. shiny red

    shiny red New Member

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    1,224
    well the book has made me do it,going to try a bit of barrel work :w00t: exhaust port first i quote the exhaust port must be lower than the the piston at bdc to ensure best exhaust flow .so thats where i am going to start see the pic ,

    [​IMG]
     
    shiny red, Mar 20, 2008
    #1
  2. lol

    lol New Member

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    964
    yh keep us posted on how it gose ;)
     
    lol, Mar 20, 2008
    #2
  3. Jamie

    Jamie Active Member

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    be careful when altering timeings. might want to try some transfer opeing first, or widening the port before heightening it.

    i started my practice with the exhuast port. but was more flowing it from the inside rather than altering on the actualy face of the barrel.

    also a word of advice, if your like me and dont have a very steady hand then positon it to you can lean your hand on something lol.
     
    Jamie, Mar 20, 2008
    #3
  4. MiNoR cOnFuSiOn

    MiNoR cOnFuSiOn Administrator Staff Member

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    he said the bottom.. fuck all to do with timings LOL.. ill send some pics your way when your next on msn m8... should get the old ticker tocking ;)
     
    MiNoR cOnFuSiOn, Mar 20, 2008
    #4
  5. Jamie

    Jamie Active Member

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    ah right nevermind me then. lol
     
    Jamie, Mar 20, 2008
    #5
  6. *James*

    *James* New Member

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    625
    Wont using a plate/thick [single piece] gasket give the same outcome?

    Im sure i remember doing that on the b1 engine graham.?


    Good luck btw shiny, hope it goes well. I'm sure it will with a bit of help from the right people. ;)
     
    *James*, Mar 20, 2008
    #6
  7. gazell

    gazell Active Member

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    i'll keep my eyes on this..
     
    gazell, Mar 20, 2008
    #7
  8. MiNoR cOnFuSiOn

    MiNoR cOnFuSiOn Administrator Staff Member

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    no that will raise the top an bottom edge of the port.. using no gasget drops them but then squish is disturbed.. just set squish then mark with that gasget.. only needs to be SLIGHTLY below the exhaust but as close as possible wihtout going above.. a step down is alot less harsh than a step up for the gas.
     
    MiNoR cOnFuSiOn, Mar 20, 2008
    #8
  9. *James*

    *James* New Member

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    625
    Sorry lol, i was thinking the correct way but find it hard to put it into words lol :emb: .... So basically you could run no gasket and then re-machine the dome to the required squish?
     
    *James*, Mar 20, 2008
    #9
  10. MiNoR cOnFuSiOn

    MiNoR cOnFuSiOn Administrator Staff Member

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    yup..bit of a pain to do tho. BEST way is use a spacer, drop the port's then machine down the thickness of the spacer from the top of the barrel. whatever the spacer thickness you gain the same mm port raise across the band so you dont have to worry about getting blowdown and timings correct as its a passive raise. easy to work out the timings from the raise vs stroke vs the original timings
     
    MiNoR cOnFuSiOn, Mar 20, 2008
    #10
  11. shiny red

    shiny red New Member

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    its my 172 max :D
     
    shiny red, Mar 21, 2008
    #11
  12. MiNoR cOnFuSiOn

    MiNoR cOnFuSiOn Administrator Staff Member

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    dont forget to remove malossi and grind in "shiny" to the barrel :D
     
    MiNoR cOnFuSiOn, Mar 21, 2008
    #12
  13. shiny red

    shiny red New Member

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    removed malossi but wont i lose bhp without malossi written on it :w00t:
    finished the bottom of the exhaust port i think ?gonna match the outlet now to the stub ,i am going to machine the inner section of the stub out so its the same size as the inner of the front pipe then match the barrel to that?

    [​IMG]
    [​IMG]
     
    shiny red, Mar 22, 2008
    #13
  14. capri dave

    capri dave Active Member

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    wow shinys haveing sex with a 172 barrel :pimp:
     
    capri dave, Mar 22, 2008
    #14
  15. px166bajaj

    px166bajaj Active Member

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    1,367
    Sometimes those parts just look so daamn goood! :w00t:
     
    px166bajaj, Mar 22, 2008
    #15
  16. MiNoR cOnFuSiOn

    MiNoR cOnFuSiOn Administrator Staff Member

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    remember, you dont want it too wide at the bottom, an keep the angle consistant throughout the exhaust tract.
    push the sides at the top out without touchin the bottom of the side's.. make it completly flat to the highest point of the port then set blowdown by removing slight ammounts from the middle of the top. sounds complicated but pics are REALLY helpful. (only got fuckin ms paint on mums comp)
     
    MiNoR cOnFuSiOn, Mar 22, 2008
    #16
  17. gazell

    gazell Active Member

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    fuckinghell minor is there anything u dont know lol.. i bet you could tune the fucking star trek space ship lmao

    what book would u reccomend on porting.. dont wanna try it cos i dont know anything about it.wanna learn before i try

    shiny is this a spare barrel ur porting or the one from your own bike
     
    gazell, Mar 22, 2008
    #17
  18. capri dave

    capri dave Active Member

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    5,076
    i do beleive its the barrel from his bike ;)
     
    capri dave, Mar 22, 2008
    #18
  19. MiNoR cOnFuSiOn

    MiNoR cOnFuSiOn Administrator Staff Member

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    if you wanna learn somin grab the bull by its horns.. doing it wrong is the best lesson.. :D

    no books on porting are any good.. just read them all and make your own mind up from what people say.. most of them are for geard bikes so alot of it can be binned, you want peak power and fuck all else really. transmission can make up for a lack of low rpm power.
    jus get reading tho as if you know why somthing works you can figure out how to make it beter all by yourself
     
    MiNoR cOnFuSiOn, Mar 22, 2008
    #19
  20. shiny red

    shiny red New Member

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    1,224
    yeah barrel off me bike no point in playing with a spare, may as well just dive in,got the shite stroke to keep me on the road,will do minor thanks :D
     
    shiny red, Mar 22, 2008
    #20
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