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).
Problems with a 4-port cylinder head, particularly the inefficiency of the exhaust silencer.
| Identifier | ExFiles\Box 93\4\ scan0103 | |
| Date | 20th January 1937 | |
| 319 Hs.{Lord Ernest Hives - Chair} from Rm.{William Robotham - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to RHC.{R. H. Coverley - Production Engineer} Rm{William Robotham - Chief Engineer}12/R.20.1.37. P.III - 4 Port Cylinder Head. Referring to RHC{R. H. Coverley - Production Engineer}2/MJ.11.1.37., we are enthusiastic about the 4 port cylinder head, and it is going to France on 35-EX for a 15,000 mile test within the next few days. It has, however, introduced several problems, one of which is the efficiency of the exhaust silencer. Unfortunately, the standard silencer is no good at all with a 4 port cylinder head, and so far we have no had much success in evolving an exhaust system which will do the job. It is, therefore, not possible to consider introducing the 4 port cylinder head until these problems have been solved. Rm.{William Robotham - Chief Engineer} | ||