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  1. #1
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    Default Triumph, Norton, BSA exhaust question

    What's the common size dia pipe used for exhaust ? Triumph, Norton, BSA ?
    1.75" ?
    thanks

  2. #2
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    Default triumph

    both preunit and unit twins are 1.5 inches on the pipes od
    heads ports are 1.5 inches id...hope that's what you wanted to know

  3. #3
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    Default

    1.50 or 1.625 are the typical sizes. some will go up to 1.75

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    Default

    from what I know about Triumphs.... the 500's were 1 1/2", the early pre units were 1 3/4", and the late pre units and units were 1 5/8".
    Norton's were 1 5/8", I can only assume BSA was the same as Triumph.
    a little back pressure is a good thing, large open pipes make great noise but not great power.

  5. #5
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    Default

    thanks all

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