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 two different exhaust manifold designs.
| Identifier | ExFiles\Box 181\M13\M13.2\ img056 | |
| Date | 19th May 1931 | |
| COMPARISON OF EXHAUST MANIFOLDS ENGINE IV G8. JAPAN HEAD 3.25 BORE 112° CAMSHAFT 5.25 C.R. TWIN ZENITHS 26 M.M DIA. CHOKES 1.250 IND. PIPE PI TYPE MANIFOLD THREE DOWNTAKE SCHEME B.M.E.P. R.P.M. 3' DIA 5.50 DIA E.56031 TO PI EXPANSION ARRG'T E.82070 BOX AND FISHTAIL BOX E.79334 R.M. | ||