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).
Engine development, including connecting rods, future Bentley engines, engine smoothness, and supercharging.
| Identifier | ExFiles\Box 161a\4\ scan0143 | |
| Date | 3rd October 1936 guessed | |
| (7) test in due course. Connecting Rods. An engine is being run with forged R.R. 56 shims in the connecting rod bigends, with a view to changing over on production as soon as possible, owing to the difficulty of retaining Hall's metal on the present steel shims. This engine will be fitted with the present standard cast iron alloy bushes, a Bentley engine also being run fitted with forged R.R.56 big-end bushes and shims, and a further experiment is being instructed to test light alloy bushes made in forged 1½% tin alloy, as these latter may have less tendency to pick up than the R.R.56. Future Bentley Engine. The experimental conversion of a Bentley engine to overhead camshaft type of cylinder head should soon be available for running. It is agreed that the single cylinder conversion of this type of head should not be proceeded with any further. The primary object of this experiment is to determine whether an overhead camshaft drive and tappet mechanism can be made to reach the required standard of silence, and in this respect the results will be of interest also to the future Wraith engine, since the policy laid down is that Bentley and Wraith engines shall substantially be of the same production type. Engine Smoothness. Design have produced a scheme for a simple machine to section plaster casts of combustion chambers to integrate the rate of change of flame front area. This will shortly be instructed. Supercharging. Designs for the supercharged induction scheme on the Bentley are now nearing completion, and should shortly be ready for instruction. Experimental data is now available regarding | ||