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Math Help - Need help shifting a graph 180*

  1. #1
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    Need help shifting a graph 180*

    I'm making a spreadsheet for things engine/internal combustion related and, me being not the smartest, am running into troubles, simple stuff for a few of you I'm sure.

    My basic question right now is this,

    How do I shift this 180*?
    Code:
    =Sheet1!$B$31*(COS(RADIANS(E4))-(($B$8/$B$6)*SIN(RADIANS(E4))^2)/(SQRT(1-($B$8^2/$B$6^2)*SIN(RADIANS(E4))^2)))
    B31= Dynamic Compression (this is what you measure with a compression tester)
    E4= Crank Angle in degrees
    B8= Crank Radius
    B6= Rod Length

    Guessing it's something rather simple and I'm just not seeing it.

    Also will the answer work for shifting variations of a 720* total combustion cycle?
    Say for a V8, V6, I4 ... each piston is at a different point in the cycle and thus a different point on the graph.

    Hopefully this makes sense.

    Thanks in advance for any assistance.
    BTW, this isn't homework/school related, simply for my personal benefit.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by iminhell View Post
    I'm making a spreadsheet for things engine/internal combustion related and, me being not the smartest, am running into troubles, simple stuff for a few of you I'm sure.

    My basic question right now is this,

    How do I shift this 180*?
    Code:
    =Sheet1!$B$31*(COS(RADIANS(E4))-(($B$8/$B$6)*SIN(RADIANS(E4))^2)/(SQRT(1-($B$8^2/$B$6^2)*SIN(RADIANS(E4))^2)))
    B31= Dynamic Compression (this is what you measure with a compression tester)
    E4= Crank Angle in degrees
    B8= Crank Radius
    B6= Rod Length

    Guessing it's something rather simple and I'm just not seeing it.

    Also will the answer work for shifting variations of a 720* total combustion cycle?
    Say for a V8, V6, I4 ... each piston is at a different point in the cycle and thus a different point on the graph.

    Hopefully this makes sense.

    Thanks in advance for any assistance.
    BTW, this isn't homework/school related, simply for my personal benefit.
    What os wrong with:

    =Sheet1!$B$31*(COS(RADIANS(E4+180))-(($B$8/$B$6)*SIN(RADIANS(E4+180))^2)/(SQRT(1-($B$8^2/$B$6^2)*SIN(RADIANS(E4+180))^2)))

    CB
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