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).
Test report on engine booming and induction roar in car 27-EX compared to 26-EX.
| Identifier | ExFiles\Box 28\5\ Scan053 | |
| Date | 2nd April 1931 guessed | |
| -2- The booming of 27-EX. with all the four engine feet fitted was not excessive up to 65 m.p.h. At 70 m.p.h. there was a considerable roar from the induction system presumably due to the carburetter, We consider that this car is far better than 26-EX. for roughness and booms in its present condition. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||