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).
Necessity of drilling certain holes in car engine cylinder heads for inspection purposes.
| Identifier | ExFiles\Box 132\4\ scan0056 | |
| Date | 19th February 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} c. to HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}1/AP.19.2.37. CAR ENGINE CYLINDER HEADS. In reply to your memo HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth}1/VS.{J. Vickers}16.2.37. in which you query the necessity for drilling the holes in the cylinder head, which correspond with those holes in the cylinder block which are now left undrilled. A query with regards to the holes in the gasket could be added to this, and the answers are as follows :- quoted from a memo issued by the Design Dept. some time ago. E/Jnr.{Charles L. Jenner}1/HP.14.5.36. ("---------the design of the gasket is as before, so that it cannot be put on wrongly end for end. As regards the cylinder head, this is also unchanged, as the drilled water holes are useful for inspecting and freeing the passages from casting sand") It is our opinion that the holes should be retained, for the purpose stated above; as only last week, a faulty production head which was sawn up, revealed an unusually large quantity of surplus metal in the water passages due to faulty casting. Investigations during the last five years have clearly proved how badly we need improved water spacing in our cylinder heads. This is now being catered for on the new Wraith and Bentley cylinder heads. But we shall still need all means of inspection available. In conclusion, we can say that if the holes in question were left undrilled in the cylinder head, the saving would be one penny each on 25/30 and Bentley, and under two pence on Phantom III. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||