1978-02-01

A Simple High Shear Viscometer-Aspects of Correlation with Engine Performance 780981

A simple rotary viscometer has been constructed in which multi-grade oils can be tested at temperatures up to 150°C and at shear rates of up to 4 × 105 s-1. Correlation has been made using this apparatus between multi-grade oil shear stability and engine bearing and cylinder bore wear. However, additional tests demonstrated that the chemical action of anti-wear additives also has a major influence on cylinder bore wear.

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