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).
Tests conducted on nitro-alloy crankshafts and camshafts in a development engine.
| Identifier | ExFiles\Box 43\3\ Scan228 | |
| Date | 2nd November 1929 | |
| X4003. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/VH. c. SG.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} Rg.{Mr Rowledge} c. E.{Mr Elliott - Chief Engineer} Hy.{Tom Haldenby - Plant Engineer} Hs{Lord Ernest Hives - Chair}/VHll/ADL2.11.29. TESTS WITH NITRO-ALLOY PARTS. +3865. X4003. CRANKSHAFT. We have a nitro-alloy crankshaft fitted to one of our development engines F.Xis.93 which has run just over 28 hours. When the engine was stripped after the first two hours (endurance test) the bearings were in excellent condition. Further running is required before we can form an opinion upon the merits of a crankshaft in this alloy. CAMSHAFTS AND ROCKERS. When F.Xis.93 was fitted with a nitro-alloy crankshaft, the camshafts and rockers were also in the same metal. During the first half hour of running in, however, the surfaces of all the cams were found to be flaking badly. It was found that the hard brittle skin on the surface of the cams was cracking up due to the layer having insufficient support from the metal beneath. A further set of camshafts are being made up. It is proposed to "etch" the surface of the cams to remove exterior brittle portion. Hs.{Lord Ernest Hives - Chair} | ||