COLD CRANKING SIMULATOR APPARENT VISCOSITY USING COLD CRANKING SIMULATOR: ASTM D2602
(Equivalent Test Methods: IP 350 and DIN 51377)
EXPLANATION
The apparent viscosity as determined in this test method has been established as predicting engine-cranking viscosities at -18° C. This test method covers the laboratory determination of apparent viscosity of engine oils at 0 ° F (-17.8° C) and at high shear rates. The results are related to engine-cranking characteristics of engine oils. Since this test method was developed solely for use in relation to engine cranking characteristics of engine oils, the apparent viscosity values obtained should not be used to predict other types of performance. For example, this test method is not suitable to predict flow rates to rocker arm bearings, or other engine locations at low temperatures.
TEST SUMMARY
A universal motor drives a rotor which is closely fitted inside a stator. A small sample of engine oil fills the space between rotor and stator which are maintained at 0 ° F (-17° C). The speed of the rotor is a function of the viscosity of the oil. From a calibration curve and the measured speed of the rotor with the oil under test, the viscosity of the test oil is determined.
TEST PRECISION
Repeatability: 6 % of the mean
Reproducibility: 12 % of the mean
No bias statement can be made.
