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).
M.40 Test Rig camshaft lubrication, detailing bearing oil feed hole modifications and alternative test options.
| Identifier | ExFiles\Box 109\3\ scan0152 | |
| Date | 17th June 1941 | |
| 700 To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/HH. c.c. to Rm.{William Robotham - Chief Engineer} c.c. to Jmr. Rm{William Robotham - Chief Engineer}/HH.5/SW.17.6.41. M.40 Test Rig. Mr. Johnson of Messrs. Vandervells visited the Clan Foundry about a week ago, and advised us to restrict our oil feed to camshaft, to conform with the practice adopted by the majority of their customers. In accordance with his request, we sent you revised drawings of RE.1664 and RE.1666, reducing the size of the feed hole from .187 diameter to .093. Mr. Johnson did not inform us that he had already supplied three sets of these bearings on the 1st of May. As these bearings had already been ordered by the Experimental Dept., Rm.{William Robotham - Chief Engineer} now requests that a further three sets of reduced size oil hole be ordered. Will you kindly arrange. We shall now have three conditions for camshaft lubrication on the Myth engine. The first engine to be built has no camshaft bushes, the camshaft having a continuous groove. Should we meet with trouble running the camshaft direct in the crankcase, we shall be in a position to fall back on alternatives :- (a) Bearings with .187 diameter oil feed holes. (b) Bearings with .093 diameter oil feed holes. This will give us an opportunity to experiment with our oil pressures which we have found to be on the low side. We attach a copy of Vandervell's letter to HPS{Horace Percy Smith - Experimental Factory Mgr}'s memo. Rm{William Robotham - Chief Engineer}/HH. | ||