Triumph pre-unit valve timing

Discussion in 'Classic Motorbikes' started by Chris Whelan, Aug 21, 2003.

  1. Chris Whelan

    Chris Whelan Guest


    Can any kind soul tell me what the valve timing for a pre-unit iron head
    T110 shoud be please?
    I'm looking for the number of degrees so I can check with a degree disc,
    rather than the standard way of using the timing marks.


    Chris Whelan, Aug 21, 2003
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  2. Chris Whelan

    RG Guest

    Hmmmm. I've got the inevitable crappy Haynes manual for Pre-units Twins
    1947 to 1962 - PLUS the reprint of the Triumph Workshop Instruction Manual
    No. 17 1956 to 1962 that has a technical data sheet for the Tiger T110.

    The tech data pages for the Tiger T110 in the Workshop Instruction Manual
    gives the following figures:

    Valve Timing: (with 0.020 in (0.50 mm) tappet clearance for checking)

    Inlet Valve opens BTC 35 degrees
    Inlet Valve closes ABC 85 "
    Exhaust Valve opens BBC 73 "
    Exhaust Valve closes ATC 50 "

    all these values are group bracketed with what I presume are tolerance
    values of -0 degrees +5 degrees

    The spec table in Haynes is a dog's breakfast and difficult to make sense of
    at all.

    I should point out that Haynes seems to imply that the T110 only ever had a
    combination of cast iron cylinder block and a light alloy cylinder head -
    but God knows whether you can trust that or not, as any of their figures for
    the valve timing for any model (except for the Bonneville), bear no
    resemblance to those above.

    Give me a yell if that comes across as a load of bollocks and I'll sort some
    scans out so you can see why.
    RG, Aug 21, 2003
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  3. Chris Whelan

    Chris Whelan Guest


    Many thanks for your swift and informative reply.

    Chris Whelan, Aug 22, 2003
  4. Chris Whelan

    R L Driver Guest

    Given that all Pre unit cams are pretty well interchangable , and that
    owners have had a propensity to fit "E3134" profiles , and that there are
    different cam followers also , bearing in mind Triumphs 3 keyway "vernier"
    arrangement and the fact that Haynes manuals are bloody useless, I cant say
    I envy you the task.
    Steve the grease
    R L Driver, Aug 23, 2003
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