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Timing=UDC?

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  • Timing=UDC?

    I know what TDC is, and I know what BTDC and ATDC is. What is UDC?

    I used the search and found that IGN is the 4* advanced or BTDC and that UDC is 0* TDC, but what does UDC stand for?

    And then it looks like there is a mark that says "in OP1" whatdoes that mark on the damper mean?

  • #2
    Upper Dead Center.

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    • #3
      in OP1 = intake on #1 cylinder opens
      Dick Steinkamp
      Bellingham, WA

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      • #4
        I learn something everyday. Now if only I could remember past tomorrow.

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