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).
Proposing a new method for fine boring 20-HP cylinders and a plan for testing.
| Identifier | ExFiles\Box 103\4\ scan0123 | |
| Date | 1st January 1935 | |
| X5050 To WGR. from E.{Mr Elliott - Chief Engineer} c. Hs.{Lord Ernest Hives - Chair} Sft.{Mr Swift} E.2/HP.1.1.35. Fine Boring of Cylinders. With regard to the above subject, the question of fine boring a 20-HP. cylinder block bolted up with crankcase and cylinder head in position has been kept going, and we reached the conclusion that it was not possible to do this through the crankcase on any existing machine satisfactorily. We therefore now propose to bore six large holes through the cylinder head of a diameter slightly larger than the bore so that the boring can be done from above through the head. This cuts away a certain amount of the cylinder head, but it still leaves the various bosses for the holding down bolts. Sft.{Mr Swift} is still interested in making a test and if you are in agreement we propose to prepare a cylinder block and head in this way bolted up to the crankcase, and Messrs. Dowding and Doll would have the boring operation done at the Daimler Works during one week-end. Sft.{Mr Swift} would then carry out an inspection of the cylinder bores and pass the block throughthe usual routine production test for observation, after which it could be decided what further steps, if any, were advisable. It will be remembered that our major objective in considering this method of boring, apart from other advantages claimed, is to eliminate the strains and distortions arising from the bolted up construction. E.{Mr Elliott - Chief Engineer} | ||