Oils in real engines are similarly sheared, high in the journal bearings, oscillatory on piston rings and low in galley. Most developmental work went into proper sizing of the flat to simulate relative shear rate distribution in an "average engine". Both an engine and simulator is calibrated with a set of Newtonian standard crank case oils with known viscosities.
Oils in real engines are similarly sheared, high in journal bearings, oscillatory on piston rings, and low in galley. Most developmental work was dedicated to sizing the flat correctly to mimic relative shear rate distribution within an "average engine". Both an actual engine and a simulator were calibrated using Newtonian standard crank case oils with known viscosities.