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).
Record of a telephone conversation regarding camshaft specifications for 20/25 HP, Phantom II, and Continental Phantom II models.
| Identifier | ExFiles\Box 13\2\ 02-page132 | |
| Date | 4th September 1931 | |
| COPY. 87090. E.{Mr Elliott - Chief Engineer} HS.{Lord Ernest Hives - Chair} BY/Crh. BY/SS.{S. Smith} X.5090. X.7090. X.7120. BY.{R.W. Bailey - Chief Engineer}/G.4.9.31. TELEPHONE CONVERSATION BETWEEN WEST WITTERINGHenry Royce's home town AND BY.{R.W. Bailey - Chief Engineer} - FRIDAY 4TH. SEPTEMBER 1931. --- 20/25 HP. CAMSHAFTS. --- E.{Mr Elliott - Chief Engineer} confirms that R.{Sir Henry Royce} expects BY's Department to produce some new forms for the 20/25 HP. cams. In order to keep within the existing diameters of bearing housings we are at liberty to reduce the base diameter of the cam from 1.050 to something near .900 as circumstances may dictate. The new forms are to be combined with the modified angle between inlet and exhaust viz. 112°. The heavy acceleration can be put up as we find we require it to meet these conditions. PHANTOM II. CAMSHAFTS. --- Here also a new camshaft is required to the following specification:- Two new forms required to the present timing for standard Phantom II, but the cam forms to give a higher lift similar to some forms we have already developed, giving E.{Mr Elliott - Chief Engineer} thinks from memory .47 lift. The timing is to be the same as at present but the angle between the cams - inlet and exhaust - is to be 112° instead of 116°. E.{Mr Elliott - Chief Engineer} remarked, however, that he would hold over a definite decision on the actual lift to be attained until he had had an opportunity of discussing the matter with R.{Sir Henry Royce}, but he would be able to tell us on Monday what the lift had to be. CONTINENTAL PHANTOM II. --- Improvements to be included :- (a) Higher compression. (b) Higher lift valves. (c) Improved camshaft. (d) Twin carburetters. From our side we pointed out that instructions for the two single carburetters for the 20/25 had been completely issued to Expl. Dept., and this being so we reminded E.{Mr Elliott - Chief Engineer} that we had not received the promised scheme for the induction pipe and the air intake. E.{Mr Elliott - Chief Engineer} informed us that he had got a scheme which would enable us to get on with the job and this would be sent along. BY.{R.W. Bailey - Chief Engineer} | ||