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).
The adoption of a .094' hole on the push rod side of the rocker for the Bentley & 20/25 valve gear.
| Identifier | ExFiles\Box 88\4\ scan0159 | |
| Date | 9th April 1936 | |
| To Mx.{John H Maddocks - Chief Proving Officer} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} X254 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/KW.9.4.36. Reduced Feed to Bentley & 20/25 valve Gear on the Valve Side. With reference to your query re the adoption of the .094" hole on the push rod side of the rocker, as shown on EB.2850, we find that we had these holes drilled in the Bentley rockers before the car left for its 15,000 miles test, and asthese have already done over 10,000 miles in France we think that this hole may be instructed for production forthwith. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||