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 comparison graph for two different exhaust manifold designs.
| Identifier | Morton\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. 120 110 100 90 80 70 60 R.P.M. 500 1000 1500 2000 2500 3000 3500 3" DIA. 5.50 DIA. E 56031 TO PI EXPANSION ARRGT E 82070 BOX AND FISHTAIL BOX F 79334 | ||