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).
Graph comparing the performance of various experimental exhaust manifolds on a 20 HP engine.
| Identifier | ExFiles\Box 6\7\ 07-page027 | |
| Date | 21th January 1928 guessed | |
| 20. HP EXPERIMENTAL EXHAUST MANIFOLDS. TESTS MADE ON 20 HP. ENGINE COMPn RATIO 5.45/1. STD. CYL. HEAD & VALVES LONG DURATION CAMSHAFT. ZENITH T.D. CARBURETTER(S). B.H.P. B.M.E.P. lbs/sq in R.P.M. OPEN EXHAUSTS STANDARD MANIFOLD. SCH 934 SCH 935 SCH 936 AClifton | ||