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).
Cylinder bore wear measurements for car B.118.GA after using Arctic Oil.
| Identifier | ExFiles\Box 100\3\ scan0106 | |
| Date | 28th April 1939 | |
| To By... from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} c. Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}12/N.28.4.39. Re: Arctic Oil. All the three cars we have had running on Arctic oil have ceased to use it. Two have been re-sold after a small mileage, and the other Owner was taken off as he was going to tour the Continent. We obtained the cylinder bore wear of this car before it went abroad, it is as follows:- B.118.GA, Mileage 6,712 since rebore. | Bore. | Nominal. | Taper. | Oval. | C. | T. | |-------|----------|----------|----------|-----|-------| | 1. | 3.515 | .0015" | Nil | 1/2 | 1 1/2 | | 2. | " | " | .0005" | " | " | | 3. | " | " | " | " | " | | 4. | " | .001" | Nil | " | 1 | | 5. | " | .0015" | .0005" | 1 | 1 1/2 | | 6. | " | .002" | .001" | 1 | 2 | We should say this is good for the mileage run. GWH.{George W. Hancock - Head Chateauroux} | ||