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Thread: Multi Cyl into one exp chamber

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    Default Multi Cyl into one exp chamber

    Ok I know you can have 2 cyl into a single chamber as per seadoo's and ski doo's
    but can you put 4 or 6 cylinders?

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    ANTHONY McCULLOCH
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    Thanks for the find.
    but 2 1000cc sled engines joined is almost double that ( with pipes that is and emission compliant)

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    Pretty sure you have to have pairs and multiples of pairs. In this case, 3 into 6 would work.

    Jeff
    "We live at the bottom of an ocean of air." - General Marvage Slatington

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    Quote Originally Posted by Fastjeff57 View Post
    Pretty sure you have to have pairs and multiples of pairs. In this case, 3 into 6 would work.

    Jeff
    there are plenty of seadoo things with 3 into 1.
    I found a couple of bike threads with people looking for data to build 3 into 1 for the old Kawa's and Suzuki's. All they said was less peak power than 3 singles
    Maybe 4 into 1 only works with a megaphone as OMC set a world record with?
    I guess 77 140's have a 4 into one megaphone.
    I guess there is very little data on 4 cyl as there are not many ( less GP 500 bikes with 4 pipes and tons of HP)

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    Due to the increased size of the common header(for volume) the pulses at the exhaust port are weaker....But with enough time and $$$ (testing) they will work.

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    .."there are plenty of seadoo things with 3 into 1."

    Correct. I shouldn't have used the word "pairs". But the pulses must be in a proper sequence, and 6 into 4 chambers is not.

    Not
    "We live at the bottom of an ocean of air." - General Marvage Slatington

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    Quote Originally Posted by Fastjeff57 View Post
    .."there are plenty of seadoo things with 3 into 1."

    Correct. I shouldn't have used the word "pairs". But the pulses must be in a proper sequence, and 6 into 4 chambers is not.

    Not
    Would you run 4 pipes into one then into the divergent cone or 4 pipes into the cone so look like a 4 stroke header collector?

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    Absolutely. A zillion V-8 race car engines use that setup.

    Jeff
    "We live at the bottom of an ocean of air." - General Marvage Slatington

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    Quote Originally Posted by Fastjeff57 View Post
    Absolutely. A zillion V-8 race car engines use that setup.

    Jeff
    If it was a zillion v8 two stroke race cars I would have some data to work with hence the question.

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