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).
Test report on Engine No. SS-3 detailing running conditions and tabulated compression pressures.
| Identifier | ExFiles\Box 65a\2\ scan0062 | |
| Date | 28th September 1928 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} 'SS{S. Smith}' ENGINE. Engine No. SS{S. Smith}-3 - Total running time to date = 38 1/4 hrs. Running conditions. Claudel Hobson carburetter (Eagle IX) Hop-spot in action (water temp. = 75°C) Exhaust manifold fitted, and bed exhaust system. 116° Camshaft - Cam forms E.77854/5. The compression pressures of this engine have been ascertained throughout the speed range for each individual cylinder; the results being tabulated below :- Max: comp: pressure (Lbs/sq. in.) ------------------------------------------------------------ R.P.M. | No.1. | No.2. | No.3. | No.4. | No.5. | No.6. ------------------------------------------------------------ 3000 | 86.5 | 86.5 | 88.5 | 88.0 | 86.5 | 84.0 2500 | 90.5 | 93.0 | 93.5 | 95.0 | 92.5 | 90.5 2000 | 94.5 | 95.5 | 95.0 | 95.0 | 95.0 | 94.0 1500 | 94.5 | 94.0 | 95.0 | 95.0 | 93.0 | 93.5 1000 | 86.5 | 86.5 | 88.5 | 87.5 | 86.5 | 87.0 750 | 89.0 | 88.0 | 89.5 | 89.0 | 88.0 | 89.5 The average figures for above are plotted on V.431. Tests to ascertain the mechanical effcy. have also been carried out, the results being given on V.432. The method used was that in which the loss of torque is noted when the cyls. are cut out one at a time, the speed being kept constant. The Claudel Hobson carb. had been removed and a std. Phantom carb. fitted in its place, by means of a contd:- | ||