Rod Ratio Calculator

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With the Spicer Rod Ratio Calculator, you can easily calculate the ratio between the length of the piston rod and the stroke length of the engine crankshaft.

Measure the ratio between the length of the piston rod and the stroke length of the engine crankshaft, which moves the piston from the bottom of the cylinder wall to the top.

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Measure the ratio between the length of the piston rod and the stroke length of the engine crankshaft, which moves the piston from the bottom of the cylinder wall to the top.

This is also known as top dead center, a term used when timing the engine.

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These tools provide mathematical calculations only. The instructional videos are intended only to provide guidance on how the calculators operate and are illustrative only. Neither the calculators nor the associated videos are intended to provide advice or information on vehicle operation, maintenance or safety. Dana makes no representation as to what equipment or use is appropriate for any specific vehicle.

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