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 a 6-cylinder with an 8-cylinder 'Peregrine size' engine, with technical design notes.
| Identifier | ExFiles\Box 3\4\ 04-page022 | |
| Date | 28th March 1932 | |
| X4583. Le CanadelHenry Royce's French residence. (28.3.32). R.2/HP.31.3.32. Eg. ) R.{Sir Henry Royce} } from R.{Sir Henry Royce} Hs.{Lord Ernest Hives - Chair} ) c. Sg.{Arthur F. Sidgreaves - MD} Mor. Re Bensports. ---------- I have written to Mr Sidgreaves that I should be happier that we were doing right if we made this engine 8 cy. Peregrine size. Why? Because I fear the Peregrine 6 is too small for a single model for this market, also the 8 would be useful unsupercharged as an alternative, and be very attractive; it would not delay much. The technical points are that the overhead camshaft on a 6 is difficult to drive without rattles at slow speed, the 8 would be better, and if coupled together by friction or other gearing becomes a very smooth drive with cams. at 45o, and second shaft at 112o, i.e. almost exactly 16 equally spaced cams, it would have same cross section etc. as arranged, and probably 6 bearing crankshaft, possibly larger in diameter, but 8 is not difficult to damp, even on its master period. I noticed that we settled on a cast iron head without inserts which does not seem quite satisfactory, suggest trying to get inserts, or could we use bronze head which would give good seats and better rate of expansion more like the aluminium crankcase. H.{Arthur M. Hanbury - Head Complaints} | ||