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).
Comparative investigation into the cost and material specifications of cylinder liner castings from four different suppliers.
| Identifier | ExFiles\Box 132\4\ scan0040 | |
| Date | 4th January 1937 | |
| To Hs.{Lord Ernest Hives - Chair} From RHC.{R. H. Coverley - Production Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Rm.{William Robotham - Chief Engineer} c. to Roy.{Sir Henry Royce} Handwritten: LESmith 1124 Sheepbridge, which are the best liners, seem to be the cheapest Rm{William Robotham - Chief Engineer} PH.111 CYLINDER LINERS. With reference to cylinder liner castings, investigation has been proceeding in connection with alternative supplies and cost of same which are as follows. It should be noted however that an additional charge of 9/- per liner is added to the purchase price of machined liners covering the extra operations carried out by the Works, namely - Nickel Deposit Outside. Rough Hone Bore. Final Grind Outside Diameter. Final Hone Bore when in Position. Suppliers. - Cylinder Components Limited. | Sheepbridge Stokes Centrifugal Castings Company. | British Piston Ring Company. Material - P.T.C. | D.S.M. | Mark 1V. | Brico. Brinell - 400-450 | 450-500 | 400-450 | 400-450 Cost of Castings - 3/6d. ea. | Not sold as castings. | 3/8d. ea. | 3/10d. ea. Cost of Liner as purchased (Machined up to the Nickel deposit stage) - 15/0d. ea. | 25/9d. ea. | 21/3d. ea. | 19/9d. ea. Cost of additional operations done by works. - 9/0d. ea. | 9/0d. ea. | 9/0d. ea. | 9/0d. ea. Total Cost of Each Liner. - 24/0d. | 34/9d. | 30/3d. ea. | 28/9d. ea. Total Cost per Set of Liners - £14.8.0d. | £20.17.0d. | £18.3.0d. | £17.5.0d. The investigation shows that Castings can be purchased from | ||