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).
Cost-benefit analysis of adapting full-length dry liners to the EW.1923 cylinder block.
| Identifier | ExFiles\Box 132\5\ scan0093 | |
| Date | 3rd May 1939 | |
| -4- At this juncture, therefore, we have to face the fact that figures obtained on our experimental cars, may not be of sufficient value to justify an alteration in design for production. We have a number of cars on the firm producing more or less customers' conditions, but they are not sufficient in number. We would suggest that a design is laid down adapting full length dry liners to the cylinder block EW.1923. This block is common to Wraith and Bentley V.{VIENNA} The design should then be proof tested mechanically over 30,000 miles in France, and if O.K., half a series put into production to obtain a figure of merit against the other half. Cost. In reply to our query, we have received the following information which is contained fully in By/SB.{Mr Bull/Mr Bannister}1/MG.3.5.39. Therein is contained an explanation of servicing costs connected with the reboring of cylinders; the average mileage for such a job being quoted as 35,000 miles. It has to be appreciated that this servicing cost is of necessity very flexible (in respect of loss to the Company) being dependent on conditions and customers. On the average, therefore, (based on a total output of Bentleys) cylinder wear is costing us 30/- per chassis. If for argument, dry liners were standardised (as applied to Ripple) and the rebore period put up to 60,000 miles, the total cost per chassis would definitely be no more than 25/- so that a saving to the Company would result, and other technical advantages re servicing would result. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||