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).
Comparing the performance of a deturbulated cylinder head against other designs for the 25/30 HP engine.
| Identifier | ExFiles\Box 103\4\ scan0184 | |
| Date | 9th November 1936 | |
| Files Swdl{Len H. Swindell} 519. -For- C. Byr-Des. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} JNR.{Charles L. Jenner} REM. E.3/HP.9.11.36. 25/30 HP. Cylinder Head Comparisons. In view of the results obtained with the deturbulated head, I assume you will have started a standardization sheet. It is interesting to note that the detonations fade at 12 m.p.h. as against 14 on the present head, in spite of a reduced degree of forced turbulence. We know of course it is possible to have too much of a good thing, and that only experimentation will help us to find the correct proportion. It would be interesting, therefore, to know how the deturbulated head compares with the original open type. On the Phantom II the original type of turbulent head used to be considered good for making the engine behave itself, after being run flat out. Does this apply to any degree on the 25/30?. With regard to the modifications to the governor, will JNR.{Charles L. Jenner} please get Mr Allwood to check these over from the design point of view. Any experience of running after switching off? Rem E.{Mr Elliott - Chief Engineer} | ||