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 plotting BHP and Induction Pipe Depression against RPM for a China Unit engine.
| Identifier | Morton\M13.2\ img075 | |
| Date | 23th July 1931 guessed | |
| CURVE I POWER OUTPUT LONG DURATION CAMSHAFT. CHINA UNIT 3.25 BORE. 116° CAMSHAFT 5-1 C/R ZENITH TRIPLE DIFFUSER CARB ON EXHAUST. SIDE OF BLOCK B.H.P. B.H.P./LITRE 23.6 R.P.M. INDUCTION PIPE DEPN INS / Hg EX IN 7° 54 48 .020 CL CE INLET DURATION 227 EXHAUST DURATION 235 | ||