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).
The use of mineral oil versus standard compound oil, investigating its effect on piston squeaks in the 20 HP model.
Identifier | ExFiles\Box 32\4\ Scan199 | |
Date | 30th December 1924 | |
X1588 To EY. from Hs.{Lord Ernest Hives - Chair} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Wor.{Arthur Wormald - General Works Manager} Hs{Lord Ernest Hives - Chair}6/LG30.12.24. USE OF MINERAL OIL ON CARS. 2967 Referring to EY3/H29.12.24. We have not seen sufficient proof for us to recommend a mineral oil in preference to an oil which we have used ever since the very first cars. We cannot possibly expect R.{Sir Henry Royce} to agree to such an alteration unless we can put up a strong case. We have always in the past advocated a compound oil, in fact, we have persuaded Oil Companies who usually only market mineral oils to make up a special compound oil for us. We admit, the mineral oils we have tested have given quite good results. We cannot say that the results are any better or any worse than we obtain with our standard compound oils. Our experience with mineral oils however is negligible compared with the experience we have had with compound oils. It is very difficult to imagine that piston squeaks on the 20 HP. are caused by the oil, when the same oil works perfectly satisfactory on the 40/50 HP. and also on the 20 HP. except for this one fault. If it is due to acidity in the oil, we cannot understand why it should only make itself apparent on the pistons and cylinders on the 20 HP. Below is a recent analysis of Prices 'C' and 'BB' oils. It will be seen that the difference in acidity in these two oils are not sufficient to cause the trouble. contd :- | ||