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Thread: Why is TDC labeled as Z1?

  1. #1

    Question Why is TDC labeled as Z1?

    Iím sure this is an easy one...

    Doing my very first leak down test the other day, while listening to air escaping out my exhaust, and scratching my head while being 360 from the TDC I needed, I started pondering what the Z in Z1 meant?

  2. #2
    Quote Originally Posted by Dave Awesome View Post
    ...what the Z in Z1 meant?

    Jon B.
    Vista, CA

  3. #3

  4. #4
    912->911 conversion
    Join Date
    Nov 2004
    Calgary, Alberta, Canada
    I never knew that either - thanks Dave and Jon.
    Keith Adams
    Calgary, Alberta, Canada
    912 Registry | Early 911S Registry #906 | PCA member
    1969 Blutorange 912R - 912 to 911 conversion
    1969 Mercedes 280 SE Coupe - 6 cyl 5 speed

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