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).
Engine test instructions and specifications for B.19 and O.H.C. Bentley No.23.
| Identifier | ExFiles\Box 155\2\ scan0007 | |
| Date | 30th November 1936 | |
| -2- B.19 continued Endurance to be carried out alternate 10 hours full load and ½ load. Has existing AC.1. main and new RR.56. big end bearings. Oil consumption to be taken having one of two special blocks taken from Works with new standard pistons and rings. American produced low carbon valve springs. 3 Exhaust valves in S/SLV (not stellited) 3 Inlet " " S.65. Remaining valves standard. To be run on Ethyl. ---------- No.30 BED O.H.C. BENTLEY No.23. 1. Report on chain (ask for balancer) 2. If Corrujoint is O.K. for water leaks. 3. Tests with balanced induction pipe Power and Distribution. 4. Instructions for 1.600 induction pipe to suit 1¾ carbs (S.U.) 5. Bottom valve spring washer to be detailed in order that the valve guide be retained when the inner springs are removed. 6. Following 5. we can determine the weakest springs that can be run without valve bounce at 4500 and in conjunction with observations on Phantom close coiled springs - instruct for springs on O.H.C. engine. 7. Ignition advance with present 6.5:1 C.R. with best result of 3. 8. Re-check exhaust valve expansion and valve temperature. continued | ||