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 data sheet for various exhaust system configurations.
| Identifier | ExFiles\Box 2\10\ 10-page24 | |
| Date | 10th October 1932 | |
| X 123 10.10.32. EXHAUST SYSTEM TESTS COMPLETE SYSTEM R.R. sch. 213. Barometer 760 m/m.{Mr Moon / Mr Moore} R.P.M. | Load. | Air. | Cor/Load. | B.H.P. | Ex. Back Press. | M.E.P. 4500 | 64.0 | 18 | 64.3 | 64.3 | 6.3 | 78.5 Inlet cone rebuilt with 31 holes blank leaving 32 holes Area = 4.02 sq.ins. 4500 | 64.0 | 18 | 64.3 | 64.3 | 6.5 | 78.5 Inlet cone 48 holes blank leaving 65 holes. Area 3.19 sq.ins. 4500 | 63.0 | 20 | 63.6 | 63.6 | 7.0 | 77.7 Inlet and out cones 48 hole blank. Area 3.19 sq.ins. 4500 | 62.0 | 18 | 62.6 | 62.6 | 7.3 | 76.5 Inlet and outlet cones 60 holes blanked leaving 53 holes. Area 2.6 sq.ins. 4500 | 51.0 | 20 | 51.6 | 51.6 | 8.0 | 75.2 Old type silencer and fishtail on new larger manifold and downtake pipe. 4500 | 58.5 | 20 | 59.1 | 59.1 | 11.2 | 72.2 4000 | 61.5 | 21 | 62.3 | 62.3 | 10.2 | 82.9 3500 | 71.5 | 19 | 72.2 | 72.2 | 8.5 | 95.0 3000 | 83.2 | 19 | 84.0 | 84.0 | 6.9 | 102.5 Original silencing system complete-Barometer 752 m/m 4500 | 55.5 | 22 | 56.8 | 56.8 | 12.0 | 69.4 4000 | 67.3 | 20 | 68.9 | 68.9 | 10.9 | 84.2 3500 | 77.0 | 18 | 78.4 | 78.4 | 8.7 | 95.8 3000 | 81.5 | 19 | 83.3 | 83.3 | 6.5 | 101.3 Weights of systems. Old Standard. New Resonant. Fishtail 5 lbs. 5.75 lbs Silencer 34.5 27.75 Downtake 4.0 11.5 Manifold Exp. Box. 7.0 4.0 Total 55 lbs. Total 49 lbs | ||