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 various exhaust system configurations for a B60 engine.
| Identifier | ExFiles\Box 124\1\ scan0059 | |
| Date | 29th March 1939 guessed | |
| EXHAUST SYSTEM ANALYSIS ON B60 (Nº3 UNIT) WRAITH SYSTEM ECO 872/79/90 WITH BOTH 1½" & 2" TAIL PIPE (S/8.82) CONDITION OF TEST STD BY INDN SYSTEM 2 - 1½ SW CARBS LONG DURATION INLET VALVE TIMING .030 CLCE IO 10º BTDC EO 37º BBDC IC 44º PBDC EC 15º PTDC ORIGINAL DESIGN HEAD WITH MODIFIED THROAT PD 190 6.26:1 CR{Mr Cra???ster / Mr Chichester} SODIUM FILLED EXH VALVE MOTORINE C OIL ETHYL FUEL ① OPEN EXHAUST ② MANIFOLDS ONLY ③ WITH Y PIECE & DOWNTAKE PIPE ④ WITH FRONT BOX ⑤ WITH REAR SILENCER ⑥ COMPLETE SYSTEM WITH 2" TAIL PIPE ⑦ COMPLETE SYSTEM WITH 1½" TAIL PIPE BHP RPM BACK PRESSURE INS. HG | ||