Connecting Rod Ratio

With the form below, you can calculate the ratio of your connecting rod to the crankshaft stroke.   Longer rods, which result in a higher ratio, favor the mid and upper RPM area.  Shorter rods, or a lower ratio, improve low-end torque.  The ratio should fall in the range of 1.65 to 2.00. Some typical information is listed below for reference.  Stroker motors should have longer rods if you can afford them.
  Typical rod ratios
  stock VW 1600 T-1   (69mm stroke) 1.98         (5.394″ rods, 2.71″ stroke)
  stock VW 1700 T-4   (66mm stroke) 1.92         (5.000″ rods, 2.60″ stroke)
  stock VW 2000 T-4   (71mm stroke) 1.84         (5.157″ rods, 2.79″ stroke)
  VW 2180, 82mm stroke, stock rods 1.67         (5.394″ rods, 3.23″ stroke)
  VW 2180, 82mm stroke, 5.7″ rods 1.76         (5.700″ rods, 3.23″ stroke)
  VW 2180, 82mm stroke, Porche rods 1.66         (5.352″ rods, 3.23″ stroke)
  Chevy 350, 5.7″ rods 1.64         (5.700″ rods, 3.48″ stroke)
  Chevy 360 sprint car, 6.0″ rods 1.72         (6.000″ rods, 3.48″ stroke)
  1972 Chevy “Indy motor”, 1000hp @6800 RPM, turbo & alcohol 2.85         (6.250″ rods, 2.20″ stroke)
  Calculate your rod ratio here.
  Parameter Value Units
  Stroke millimeters (50 to 120)
  Rod length inches        (4″ TO 7″)
  Rod ratio ratio