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).
Proposed Condor valve lift curve and its application to other aero engines.
| Identifier | ExFiles\Box 43\3\ Scan167 | |
| Date | 3rd September 1927 | |
| To RG.{Mr Rowledge} from E.{Mr Elliott - Chief Engineer} c. to BJ. BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} X4003 E1/M3.9.27. PROPOSED CONDOR VALVE LIFT CURVE. X.3616 X.3822 We send herewith drg. LeC.2455 giving the projected shape of the Condor valve lift curve. This curve as shewn, and also the red curve of acceleration, are purely imaginery, but are given as an idea of the proportions. The cold clearance for body inlet and exhaust is specified as .025 and it is assumed that the hot clearance of the exhaust will be .015, the inlet cam remaining unaltered at .025. These are the clearances which R.{Sir Henry Royce} thinks best for the Condor and RR.F. engines, whatever you may have adopted, or do adopt at Derby. It is thought that the beginning of the cam form which we call the cam toe or foot, having a lift of .030 achieved in the time of 10 divisions, is desirable for all aero engines, and should be when, and as, opportunity offers, applied to the RR.F engines as well as the Condor. We do not know what cam forms have been standardised for the RR.F. that is to say - whether the compensated inlet cam has been finally adopted, but we also want to use on this last mentioned engine inlet and exhaust cams to the same form with timing to suit. + + perhaps on the racing RR.F. E.{Mr Elliott - Chief Engineer} | ||