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 comparing carburetter performance under five different configurations and modifications.
| Identifier | ExFiles\Box 1\10\ B001_X106 TO X 110-page090 | |
| Date | 12th December 1932 | |
| 12.12.32. (1) Carburetter with original size chokes. R.P.M. LOAD. AIR Cor/Load. B.H.P. M.E.P. INDN: PIPE DEPRESSIONS. 4500 66.5 10 66 66 80.9 2.5 Ins.Hg. 4000 75.5 12 75.1 66.8 92 2.1 " (2) Underside face of piston diaphragm ground to a flat surface, otherwise as above. 4500 67 9 66.4 66.4 81.3 2.45 4000 75.5 13 75.2 66.8 92 2.1 (3) Suction piston removed, blanking plate fitted, all air passing thro' piston inlet. 4500 67.5 9 67 67.0 82 2.3 4000 76.5 10 76 67.6 93 1.95 (3a) Resonant silencer removed otherwise as in previous test.(3) 4500 68 10 67.5 67.5 82.6 2.15 (4) Pistons completed removed, allowing air feed both top & bottom. 4500 69 9 68.4 68.4 83.8 1.85 4000 78.5 10 78.0 69.4 95.4 1.7 (5) J.3 carburetter body with Peregrine throttle body. Hot spot distance piece 1 1/4" deep. 4500 69.5 14 69.5 69.5 84.9 1.75 4000 78.5 13 78.3 69.6 95.7 1.55 | ||