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Thread: rod length calculator. how to determine what a rod length is

  1. #1
    Junior Member APPRENTICE
    Join Date
    Aug 2003
    Posts
    20

    rod length calculator. how to determine what a rod length is

    any calculators avalable to determine what a rod length is good for? say i had a rod 6.335 what crank will this work with on a standard bbc deck? is there a calculator on sight somewhere that can figure this out ?

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2007
    Location
    Lost Creek, WV
    Posts
    533
    You just devide the rod length by the stroke of the crank to get the ratio. For example: 6.535 rod and 4.250 stroke crank...6.535 / 4.250 = 1.53.

    TS1955

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    La.
    Posts
    2,890
    Go here, second from bottom left side of main page.

    Zip.

    http://www.wallaceracing.com/Calculators.htm

  4. #4
    Senior Member EXPERT BUILDER
    Join Date
    Jan 2005
    Posts
    336
    old schoolers worry about it....newer big cubic engine guys say dont worry about it,they say find a piston that works for the induction application and where the rod stroke ratio ends up so be it

  5. #5

    stroke

    i dont agree with Russ67 totally as ratio is important, its just not as important in normally asperate motors, russ67 statement is true but what a bad rod ratio does is load the side wall of your block and in a stock block that could be bad news but most strokers motors are aftermarket blocks with thick cylinder walls, even with thick walls a bad ratio will cause more wear on walls causing more frequent overhauls and the lower the ratio the more wear, i no a guy who runs schmitt racing engines and they say ratio is very important in blown race motors and they built his and his rod ratio is very good and they told him it was important.... jm2cents

  6. #6
    Senior Member EXPERT BUILDER
    Join Date
    Jan 2005
    Posts
    336
    i do agree to concentrate on it thats why i went with the 6.7 rod vs the 6.535 i could of went with,just saying some believe its not a huge deal but i do lean twards focusing on longest possible


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