Viscosity Calculations and Conversion

Q. Can you guide me on viscosity calculations from the time measured using Ford cup (#4)?

A. I can't give you the equations for converting Ford #4 viscosity measurements to other units. However, if you go to the major vendors of viscosity instruments you will find comparison charts that provide the conversions. The following URL isd one example provided by the Paul Gardner Company; http://www.gardco.com/navigation.html and http://gardco.com/isocup.html