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 analyzing a short type exhaust system under various configurations.
| Identifier | ExFiles\Box 14\6\ Scan236 | |
| Date | 30th November 1931 | |
| RM.{William Robotham - Chief Engineer} P.42 ANALYSIS OF EXHAUST SYSTEM SHORT TYPE P. II 4.78 114° CAMSHAFT TO E.82°/4.65 C/R.{Sir Henry Royce} STD. CYL. HEAD 1.9 VALVE THROAT R.R. TWIN CARBS. 1.4" DIA. CHOKES ① MANIFOLD ONLY ② " + FRONT EXP. BOX & intermediate pipe ③ COMPLETE SYSTEM LESS FISHTAIL ④ COMPLETE SYSTEM B.H.P. B.M.E.P. LBS/SQ" R.P.M. EX IN 15 55 OIBCLCE | ||