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).
List of engine performance and detonation tests with associated shop instructions.
| Identifier | ExFiles\Box 133\1\ scan0140 | |
| Date | 4th December 1936 guessed | |
| -2- No. | TEST. | Date. | T.R.T. ---- 20. | Power with large carb and 36 m/m choke on No.2. head (un-modified). Note ignition advance (c.f. - ) 21. | Ignition detonation curves under above conditions (c.f. 18 & 19) | SHOP - Remove No.2. head and fit No.1. instructions may now be issued for modifications to No.2. 22. | Check curve on 32 m/m.{Mr Moon / Mr Moore} choke; small carb; open exh. 23. | P.C. 36 m/m choke; small carb; open exh. 24. | P.C. 36 m/m choke; large carb; open exh. 25. | Ignition detonation curves on large carb. with 36 m/m.{Mr Moon / Mr Moore} choke. | SHOP - If ready, the alum. high power head to RS.{Sir Henry Royce's Secretary}315 should be fitted, incorporating high lift rocker and 1.750" inlet valve. 26. | P.C. with large carb. and 36 m/m.{Mr Moon / Mr Moore} choke. This should line up with curve 24. Note ignition advance. 27. | Ignition - Detonation curves. 28. | Increase C.R. until detonation is at level of previous H.P. head in C.I. Detonation level to be judged as nearly as possible by the three ignition -detn. curves. This test will of course take some time. | SHOP - No.3. (Alum.) head should now be removed for modifications to inlet valve size. The 1.850" valve being fitted. It is to be replaced by No.2. C.I. head, which by this time will have been deturbulated. continued. | ||