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).
Letter to A.H.R. Fedden of The Bristol Aeroplane Co. Ltd. discussing high compression cylinder heads and axle ratios.
| Identifier | ExFiles\Box 89\2\ scan0141 | |
| Date | 25th November 1935 | |
| X261 b Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}25/KW. 25th November, 1935. A.H.R. Fedden, Esq., The Bristol Aeroplane Co.Ltd., Filton House, Bristol. Dear Fedden, Thank you for your letter of the 20th November. We have, as you probably know, a high compression cylinder head which has been fitted to several customers' cars, more particularly to those people who wanted additional performance. Personally I like this cylinder head, but there is no doubt that to avoid frequent decarbonisation a good grade of fuel has to be used. The Ethyl at present on the market is suitable for the first 3,000 miles; after that DTD-224 can with advantage be used. The cost of the high compression head is about £30. You do not say anything about the axle ratio. Personally I feel that for English conditions you would be happier with the 5% lower ratio. Yours sincerely, FOR ROLLS-ROYCE LIMITED. | ||