Have found some more pics, just thought I'd share...no commentary, just some pics that may help inquisitive people's researches.
First is how viscosity changes with shear rate and temperature in a typical multigrade...HTHS is measured at 10^6 shear rate, so well into the second Newtonian phase.
This gives an indication on the shear rates in different parts of the engine...note that galleries and stuff, the KV is the dominant range...bearings, pistons, rings the second Newtonian above a couple thousand revs.
Last, a couple of indicative VMs effect on viscosity with shear rate at cold temperatures.
First is how viscosity changes with shear rate and temperature in a typical multigrade...HTHS is measured at 10^6 shear rate, so well into the second Newtonian phase.
This gives an indication on the shear rates in different parts of the engine...note that galleries and stuff, the KV is the dominant range...bearings, pistons, rings the second Newtonian above a couple thousand revs.
Last, a couple of indicative VMs effect on viscosity with shear rate at cold temperatures.