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).
Camshaft and high compression piston modifications for 2b engines.
| Identifier | ExFiles\Box 43\3\ Scan162 | |
| Date | 28th June 1927 | |
| Hs{Lord Ernest Hives - Chair} JUN 28 1927 RECEIVED Rg.{Mr Rowledge} (WW) HS.{Lord Ernest Hives - Chair} O.R.H.C. X900 BY8/H.{Arthur M. Hanbury - Head Complaints} 28.6.27. ROLLS ROYCE F.11. - CAMSHAFTS. I would like to have some definite information as to whether we are at liberty to go ahead with the existing camshafts for the 2b engines, or whether the scheme which we have in hand in this Department for modifying the cam forms, in view of the fact that the engine speed is going to be higher, means that we must hold up the camshafts until the information in question is available. Apparently the modified camshaft would depend upon the use of high compression pistons. We do not know what was the final decision arrived at on Hs{Lord Ernest Hives - Chair}' recommendation that we should produce engines at 6:1 compression or thereabouts, which we take it would be otherwise to the drawings already existent, as for this compression piston certain difficulties, which necessitated putting up of the speed of the engine, would not be present. Possibly the West WitteringHenry Royce's home town piston drawing, LeC.2430, having 6.37:1 compression, has been produced in view of the position referred to above. Incidentally, this would mean that the partially machined forgings we have would be useless, as whilst we have covered all possibilities for existing pistons, from 6:1 compression to 8:1 compression, with plain or perfect circle type of scraper ring at the bottom, H's latest piston brings the inside crown lower than any partially machined forging allows for. Forgings which have not been started upon at all, by careful handling of each individual piece will just about come in, but only by careful marking out in the first place so as to just get the lowered crown in its correct relationship with the gudgeon pin centre. BY.{R.W. Bailey - Chief Engineer} By | ||