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).
Comparison of lap times at Montlhéry track for hydraulic adjustable rockers versus standard solid rockers.
| Identifier | ExFiles\Box 5a\4\ 04-page098 | |
| Date | 24th August 1934 | |
| MONTHLHERY TRACK. 24th August 1934. 31 G IV. Hydraulic adjustable rockers in operation. TIME FOR 1st - 3rd and 5th laps. M.P.H. 1st. 1 Minute 20 seconds. 71.672 3rd. 1 " 20 3/5 seconds. 71.135 5th. 1 " 19 seconds. 72.576 Standard 25 H.P. solid rockers in operation and clearances made - inlet .004; Exhaust .006 TIME FOR 1st - 3rd and 5th laps. M.P.H. 1st. 1 minute 19 3/5 seconds. 72.092 3rd. 1 " 19 3/5 " 72.092 5th. 1 " 18 3/5 " 72.946 the speedometer needle on stop at maximum speed A.W. Hancock. [Vertical Watermark Text]: STRICTLY CONFIDENTIAL | ||