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).
Performance graph comparing various experimental exhaust manifolds on a 20 HP engine.
| Identifier | ExFiles\Box 6\7\ 07-page031 | |
| Date | 24th November 1927 | |
| 20 HP EXPERIMENTAL EXHAUST MANIFOLDS TESTS MADE ON 20 H.P. ENGINE COMP. RATIO 5.45/1. STD. CYL. HEAD & VALVES LONG DURATION CAMSHAFT ZENITH T.B. CARBURETTOR (1) B.H.P. R.P.M. B.M.E.P. lbs/sq in OPEN EXHAUSTS SCH 934 SCH 936 STANDARD MANIFOLD C.W.H. | ||