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 examination comparing Wakefield's Castrol 'CC' oil with Price's Amber 'A' for use in gear boxes and spiral bevel rear axles.
| Identifier | ExFiles\Box 179\3\ img065 | |
| Date | 10th March 1932 | |
| S. From He/Lid.{A. J. Lidsey} c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to L. Da.{Bernard Day - Chassis Design} c. to Hy.{Tom Haldenby - Plant Engineer} ORIGINAL x1583. He/Lid.{A. J. Lidsey}7/MA.10. 3. 32. x967. ALTERNATIVE OIL FOR USE IN GEAR BOXES AND SPIRAL BEVEL REAR AXLES. We have been testing out Wakefield's Castrol 'CC' oil as an alternative to Price's Amber 'A' for use in car gear boxes on both models and for the 20/25 rear axle; it is of course unsuitable for hypoid rear axle on P.II cars. The laboratory examination of these two oils gives the following results. ------------------------------------------------------------- Amber 'A' Castrol 'XXL' Viscosity. (time of efflux from Redwood No.1 Viscometer) at 100°F.{Mr Friese} 1357 1280 at 200°F.{Mr Friese} 110 115 Cold test at 10°C. Just flows. Just flows (slightly better than Amber 'A'.) ------------------------------------------------------------- FATTY OIL Content. Nil .3% ------------------------------------------------------------- Acidity. Negligible Negligible ------------------------------------------------------------- From the above test we can assume that Castrol 'CC' is slightly less thick cold and not quite so thin when hot as Amber 'A' and in this respect is slightly superior. The fatty oil content present in Castrol 'CC' is rather advantageous where lubrication under heavy loads is desired, and although not necessary from this point of view in the gear box or axle it is not a disadvantage in such a small quantity. The majority of mineral oils now contain a small percentage of fatty (or animal or vegetable) oil. | ||