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).
Testing of a small exhaust snout on a 20/25 HP car and its effect on noise.
| Identifier | ExFiles\Box 104\2\ scan0133 | |
| Date | 13th May 1935 | |
| S/W. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} LE4/C/13.5.35. Re 20/25 HP. Exhaust Snout. I have tried the small snout on several 20/25's and do not find that this has any effect on the exhaust noise in the car, except at very high speeds when there is more hissing with this than with the plain pipe. J.L.E. | ||