exhaust q's for tech people
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Thread: exhaust q's for tech people

  1. #1
    Registered User Array CYRUS's Avatar
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    exhaust q's for tech people

    lets say your V-twin bike's exhaust came factory as 2 out all the way, would it effect your power if you changed the exhaust configuration to 2-1 with a stubby muffler?
    would you loose power or gain power?
    how would it effect the power band on the bike?
    what if you dont even bother installing a muffler but do a 2-1 configuration, how would that affect your bike?

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  3. #2
    Eh Muh Gawd Becky!! Array Purplekawi's Avatar
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    going from twin pipes to a 2-1 system will add power as long as it's a decent system but it will most likely add that power at a different rpm. it'll sem like it lost power if it had all bottom end power but gain in top end. it's a difficult question to really answer.
    That that doesn't kill us forces us to live with a busted up bike!!

  4. #3
    Moderator Array TeeTee's Avatar
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    It would more likely change how the power was made and where in the powerband. Adding a stubby muffler would let out more power since I'm guessing you don't care that it'll be making a lot of noise.

    To get the best out of the change you would need to redo the carbs or FI mapping.

    Big bikes move a lot of gas (as in exhaust, not the liquid fuel) and that means you need to flow a lot to avoid serious back pressure issues. By switching from two to one outlet pipe and can you will end up with it being extremely noisy or you will suffer from a lot of back pressure. A stubby can just does not have anywhere at all near the volume needed to act as a proper muffler for a big twin.
    A backyard mechanic without a service manual is just like a hooker without a lamp pole.... they are both in the dark.

  5. #4
    Registered User Array flemcadiddlehop's Avatar
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    I agree with TeeTee. If you think that you are going to make a header sytem for a twin it would have to go from 2 smaller pipes to 1 big pipe and it would have to do it at the correct length (the length of the header pipes will choose where the power comes in..."on pipe" ) to achieve more power.
    Most v-twin header header systems go the opposite of what you want to do. They run one cylinders exhaust out one pipe mainly, but use a number of smaller H-pipe sections to divide the exhaust out both cans. This increases the exhaust flow and lowers back pressure.
    Remember any system you put on the bike needs to be remapped.

    Cheers Gordo.
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  6. #5
    Registered User Array OneTrack's Avatar
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    Traditionally (i.e., back in the very, very old days) installing "siamese pipes" (as they used to be called) on a twin was a quick way to increase low rpm torque at the expense of high rpm performance. It always involved playing around with the carbs' jets and usually only ended up producing a different sound than twin pipes.
    In the 60's, most Brit bike companies had their "sports" bikes with twin carbs and twin exhaust on their twins...i.e., Triumph's Bonneville, BSA's Rocket Gold Star. The "touring" version of these two bikes (the Thunderbird and Gold Flash) had single carbs and siamese (2 into 1) exhausts. The "touring" bikes also had milder cams to give more 'oomph' at low rpm's in concert with the single carb and siamese pipes.
    No single engine modification can stand alone...there's always a ripple effect on other components that must be dealt with.

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