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  1. #1

    Default Motorcycle Exhaust question...


    Mga master ask lang ta ko kung ok ba kaha nga gibuhat nako ang expansion chamber sa 2stroke gi taod nako sa 4stoke 150cc pero gi remove nako ang canister. Sounds good dili parehas ug tingog sa straight pipe na gi kuhaan ug canister. Ok raba kaha ang back pressure ani? kay naa man pod bend sa chamber.

    Ingon ani ang akong expansion chamber na gi taod pero gi remove na ang canister:

    Last edited by wh3ng2004; 09-06-2013 at 11:28 AM.

  2. #2

  3. #3
    Quote Originally Posted by vernie View Post
    Unsa man diay nang back pressure?

    Back pressure - Wikipedia, the free encyclopedia
    Don't know sad boss kay di ko sweto ani gud nag basa2x lang kos uban forums and ga hisgot man gud sila regarding aning back pressure sa pipe since akong pipe na gi gamit kay sa 2stroke man din gi try nakog taod sa 4stroke. mao nag ask ko diri bacn naay maka hatag nkog idea kung pwede ba akong gi buhat kay walay tarong mechanic sa amoa gud 2 na ka mechanic akong nasuwayan tanan pulos kwarta gi huna2x wala sa trabaho basta mo andar nya mo dagan ang motor payts na maski ga ubo2x ang agi..
    Last edited by wh3ng2004; 09-06-2013 at 04:46 PM.

  4. #4
    C.I.A. nijazared's Avatar
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    di mani xa advisable bro...2 strokes need backpressure but kung 4 stroke...dapat either free flow pipe or tuned pipe...if gamay ang tubo sa muffler sa 4 stroke...ma constrict ang flow ani and mu decrease ang top end ug engine power...magka dako ang pipe mag increase sad ang flow pero ma reduce sad ang velocity ang in effect mu decrease ang torque...

  5. #5
    Elite Member KH0UJ's Avatar
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    2 stroke engines needed the expansion chamber for optimum engine performance, 4 stroke engines on the contrary dont need an expansion chamber performance wise, ipang headers pa man gani nang ubang racing cars para walay back pressure, tan-aw gani ug mga videos sa mga uphill climbing bike competitions sa youtube, some tuners use two stroke straight 4 engines, and others use the R6 four stroke engines, observe their set-up diba naa gyuy expansions ang sa mga two strokes, they cannot eliminate that kay mu down ang engine HP kung walay expansion chambers ang 2 stroke engine, on the other hand ang sa mga 4 stroke engines straight pipes na lang gyud (independent)

    now kung ita-ud na nimo ang expansion chamber sa 4 stroke engine meaning naa nay back pressure, it will result to a lesser power (HP) sa imong makina mukalas pa gyud imong gasolina, nya gusto ka ana TS?

    im talking about engine peak performance ha not efficiency.....

  6. #6
    C.I.A. nijazared's Avatar
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    Quote Originally Posted by KH0UJ View Post
    2 stroke engines needed the expansion chamber for optimum engine performance, 4 stroke engines on the contrary dont need an expansion chamber performance wise, ipang headers pa man gani nang ubang racing cars para walay back pressure, tan-aw gani ug mga videos sa mga uphill climbing bike competitions sa youtube, some tuners use two stroke straight 4 engines, and others use the R6 four stroke engines, observe their set-up diba naa gyuy expansions ang sa mga two strokes, they cannot eliminate that kay mu down ang engine HP kung walay expansion chambers ang 2 stroke engine, on the other hand ang sa mga 4 stroke engines straight pipes na lang gyud (independent)

    now kung ita-ud na nimo ang expansion chamber sa 4 stroke engine meaning naa nay back pressure, it will result to a lesser power (HP) sa imong makina mukalas pa gyud imong gasolina, nya gusto ka ana TS?

    im talking about engine peak performance ha not efficiency.....
    add lang ko...ang madaot ana kana imo exhaust valves and it can screw up your cylinder head if pasagdan lng nimo...if need jud ka pipe...pwede man palit ka anang stainless pipe nga para sa mga pump boats and then ipa bend ra...make sure nga taas ra siya para di jud kaayo saba...

  7. #7
    Elite Member KH0UJ's Avatar
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    Quote Originally Posted by nijazared View Post
    add lang ko...ang madaot ana kana imo exhaust valves and it can screw up your cylinder head if pasagdan lng nimo...if need jud ka pipe...pwede man palit ka anang stainless pipe nga para sa mga pump boats and then ipa bend ra...make sure nga taas ra siya para di jud kaayo saba...
    mao gani boss akong gi-ingon nga "engine peak performance" kay akong gi set ug example kay uphill climbing bikes man and were talking about 100+ meters ra nga dagan, tuners and factory racers dont care if ma blown engine sila sa finish line basta gamay lang gyud ilang seconds at a set distance...

    pareho ra gihapon sa motorcross, inig human sa isa ka race change oil na sad kay sunog na ang oil so they dont really care sa long term effects, they only care about is the peak engine performance....

  8. #8
    Quote Originally Posted by KH0UJ View Post
    2 stroke engines needed the expansion chamber for optimum engine performance, 4 stroke engines on the contrary dont need an expansion chamber performance wise, ipang headers pa man gani nang ubang racing cars para walay back pressure, tan-aw gani ug mga videos sa mga uphill climbing bike competitions sa youtube, some tuners use two stroke straight 4 engines, and others use the R6 four stroke engines, observe their set-up diba naa gyuy expansions ang sa mga two strokes, they cannot eliminate that kay mu down ang engine HP kung walay expansion chambers ang 2 stroke engine, on the other hand ang sa mga 4 stroke engines straight pipes na lang gyud (independent)

    now kung ita-ud na nimo ang expansion chamber sa 4 stroke engine meaning naa nay back pressure, it will result to a lesser power (HP) sa imong makina mukalas pa gyud imong gasolina, nya gusto ka ana TS?

    im talking about engine peak performance ha not efficiency.....
    Actually boss di jud na cya permanent gi cut-off nako ang canister kay di jud ka buga ang makina murag nag ugom saon man naka mekaniko man kog maayong laki gud nya ingon nya ok ra daw.. mao ako nalang ni decide na e cut-off ang canister aron mo dako2x ang lungag ug maka buga na ang hangin. sa pagka karon and diameter sa pipe kay mga 2" man siguro so medyo ka ginhawa na gamay ang engine..

    This is a project bike man gud so ga testing2x lang sad ko but plan jud nako ana is a under engine pipe or tailpipe.. BTW ang akong bike is Yamaha YSR kana naa sa akong avatar after pag install sa 4stroke engine nya pasalig man ang akong mekaniko nga nga pwede ra daw aw tuo lang sad ko...hehehe nalingaw lang kos tingog pag putol nas canister kay buto2x sad ok ra man dili karat2x ang tingog..heheh pero once ma renew na nako ang rehistro dad.on na nako ila norbing pa himoan nako ug pipe..
    Last edited by wh3ng2004; 09-06-2013 at 09:06 PM.

  9. #9
    Elite Member KH0UJ's Avatar
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    Mao gyud boss, pahimu-i na lang na ug pipe boss iha dayon mag retune sa carbs, lisud kaayo ituno sa carbs kung naay backflow ang exhaust, magkabuang ug buni sa jettings kay kusog kaayo mu back fire nya ang resulta bati ug power hehehe

  10. #10
    Naa lang ko lain pangutana, pero muffler/exhaust ra gihapon ni.

    Kinsa ninyo diri nakasuway ug SUPERTRAPP exhaust? Mo himo ba kaha silang jobal (Motofix) or Norbing ani?

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