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).
Design challenges related to a compound valve, including dirt settlement and component costs.
| Identifier | ExFiles\Box 121\1\ scan0183 | |
| Date | 8th December 1939 guessed | |
| compound valve which had to be balanced & so caused the load to be very minute (5 lbs). There is a space, in these inclined valves, where big lumps of dirt can settle in an area of low oil speeds, out of the way. I imagine that too small valve springs & valve parts become expensive due to their delicate nature, so on the sketch I have indicated | ||