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 power output of a 3.2 Litre Bentley with various exhaust systems for the Ulster T.T. race.
| Identifier | ExFiles\Box 90a\2\ Scan285 | |
| Date | 6th July 1934 | |
| 3.2 LITRE BENTLEY POWER OUTPUT (ULSTER T.T.) EXHAUST SYSTEM COMP. RATIO 7.35:1 (EB/237.A) IN. VALVE CB.745. (450.D.A) EX " EB 1375 (1.200) CAMSHAFT 'R' RS.{Sir Henry Royce's Secretary}985 (750 R.D. FOLLOWERS) STD. INDUCTION SYSTM. 1) OPEN EXHAUST 2) FULL LENGTH STRAIGHT THRO' 2 1/8" DIA. INSIDE 3) FULL LENGTH STRAIGHT THRO' 1 7/8" DIA. INSIDE 4) EXDN BOX NEAR ENGINE SMALL DIA DOWNTAKE? LARGE TAIL PIPE 5) EXDN BOX NEAR AXLE LARGE DIA DOWNTAKE) SMALL DIA TAIL-PIPE) B.H.P R.P.M TDC B.D.C. (APPLIES TO N°2.) | ||