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).
Alteration to the valve gear for Bentley and 25/30 HP models.
| Identifier | ExFiles\Box 88\4\ scan0160 | |
| Date | 15th April 1936 | |
| X254 c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} BY/Cgh.{W Clough}17/C.1S.4.36. BENTLEY AND 25/30 HP. - VALVE GEAR. It is agreed between Experimental Department and Mx.{John H Maddocks - Chief Proving Officer} that the hole on the push rod side of the rocker should be increased to .094" diameter as the result of tests which Mx.{John H Maddocks - Chief Proving Officer} has carried out, therefore will you please issue corrected detail drawings as quickly as possible. It is considered that the alteration should be done on all 25/30 HP. chassis before despatch, but in the case of the 4 1/4 litre Bentleys it is only necessary to do this on engines which have not been built up, as retrospective action is not necessary on these chassis. BY/Cgh.{W Clough} | ||