From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Laboratory report comparing the properties of Adcol Light Racing Oil, Adcol Heavy Racing Oil, and Wakefield's XL Oil.
| Identifier | ExFiles\Box 32\3\ Scan066 | |
| Date | 28th November 1923 | |
| Hs.{Lord Ernest Hives - Chair} H17/EF281123. X/5 83 Laboratory. Re 2 samples of Adcol Racing Oil, and one sample of Wakefield's XL Oil. Adcol Light Racing Oil. Adcol Heavy Racing Oil. Wakefield's XL Oil. ------------------------- ------------------------- --------------------- Coke Numbers. 0.62 0.86 1.15 Loss in 2 hrs. at 250°F.{Mr Friese} 0.50 0.70 0.76 Loss in 2 hrs. at 350°F.{Mr Friese} 3.10 3.80 6.90 Relative Viscosity. at 100°C. 26 secs. 75 secs. 28 secs. at 30°C. 330 " 885 " 627 " Composition. Not done. Not done. 16.65 % fixed oil, including 0.30% Castor Oil. Remainder substantially mineral oil. The cold set of the Adcol Light Racing Oil is about 5° below that of the Heavy Racing Oil; and the Heavy Racing Oil is about 7° below that of the XL Oil. Acidity of the three oils, and the composition of the two Adcol Oils, can be given if desired, and also a test to indicate relative carbonisation under high temperature conditions. There was not sufficient oil to give the Redwood Viscosity figures. Hl. lHe | ||