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).
Maximum speed tests at Montlherry track comparing performance with and without hydraulic adjustable rockers.
| Identifier | ExFiles\Box 11\5\ 05-page151 | |
| Date | 24th August 1934 | |
| Hotel de France, Chateauroux. Indre. France. 24th August 1934. To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. We have to-day taken tests of maximum speed on the Monthlherry track with 28 - EX and 21 G 1V. The results are as follows:- 28 - EX. Hydraulic adjustable rockers in operation TIME FOR 1st - 3rd and 5th laps. M.P.H. 1st.- 1 Minute 7.4 seconds. 85.958. 3rd.- 1 " 7.2 " 86.214. 5th.- 1 " 7.2 " 86.214. hydraulic adjustable rockers cut out of operation and clearances made - Inlet .004; Exhaust .006 TIME FOR 1st - 3rd and 5th laps. M.P.H. 1st.- 1 Minute 7 seconds. 86.472 3rd.- 1 " 7 " 86.472 5th.- 1 " 7 " 86.472 The speedometer read 81 MPH. for actual 86 MPH. G.W.H. | ||