Table of B.HP and power loss figures for different exhaust system configurations at 3,500 R.P.M.
| Identifier | ExFiles\Box 8\8\ 08-page45 | |
| Date | 18th June 1938 guessed | |
| 3,500 R.P.M. B.H.P. LOSS OPEN EXHAUST 102.7 MANIFOLD ONLY 99.7 3.0 MANIFOLD & FRONT EXP. BOX 93.5 9.2 " " & INTER. BOX 91.7 11.0 " " & REAR SILENCER without top hats 89.9 12.8 " " & STD. REAR SILENCER top hats 45 holes 89.9 12.8 COMPLETE WRAITH EXHAUST SYSTEM WITH 1 1/2" TAIL PIPE 81.6 21.1 " " " " 1 3/4" TAIL PIPE 87.5 15.2 STRAIGHT THRO' 2" PIPE FROM MANIFOLD - TOTAL LENGTH 110" 95.8 6.9 FRONT EXP. BOX & 2" PIPE - TOTAL LENGTH 110" 91.7 11.0 STRAIGHT THRO' FRONT PIPE, INTER BOX, & STD. REAR SILENCER 92.6 10.1 AS ABOVE WITH 1 1/2" TAIL PIPE 86.5 16.2 " " " 1 3/4" TAIL PIPE 90.8 11.9 | ||
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).