20 HP exhaust tests, comparing horsepower results between a standard and modified system.
| Identifier | ExFiles\Box 113\2\ scan0059 | |
| Date | 20th March 1924 | |
| R.R. 493A (20H) (D.A. 652 20-3-24) J.H.D. X488 EXPERIMENTAL REPORT. Expl. No. 4238 REF: Hs {Lord Ernest Hives - Chair} 2/LG1.7.24. X488 To R. {Sir Henry Royce} from Hs. {Lord Ernest Hives - Chair} c. to CJ. RG. {Mr Rowledge} c. to E. {Mr Elliott - Chief Engineer} DA. {Bernard Day - Chassis Design} c. to BY. {R.W. Bailey - Chief Engineer} WOR. {Arthur Wormald - General Works Manager} 20 HP. EXHAUST TESTS. We have carried out tests with a modified form of exhaust system on the 20 HP. engine. Comparisons have been made on the bench and on the road. We arranged three separate exhaust pipes - one leading away from each exhaust port on the cylinder head into a front expansion box similar to that which we use on the 40/50 HP. The centre exhaust pipe supplied heat to the standard hot-spot. Attached herewith are results of tests. | | H.P. | | | REVS. | STANDARD. | MODIFIED.| | 500 | 10.8 | 10.8 | | 750 | 16.3 | 17.0 | | 1000 | 21.9 | 22.7 | | 1250 | 27.8 | 28.2 | | 1500 | 31.8 | 32.6 | | 1750 | 37.3 | 38.2 | | 2000 | 42.4 | 43.4 | | 2250 | 46.5 | 48.3 | | 2500 | 47.5 | 50.5 | | 2750 | 48.0 | 51.6 | | 3000 | 47.1 | 51.4 | Power curve taken on test bench with complete exhaust system of each type. contd:- | ||
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).