Notes and timing diagrams for a 'No 1' camshaft trial, including performance expectations and component details.
| Identifier | ExFiles\Box 5a\1\ 01-page150 | |
| Date | 21th May 1931 guessed | |
| TRY No 1 CAMSHAFT (2) Ex. cam to Sch. 1159. In. cam to Sch. 1158. In. cam to Sch. 1158. Ex. cam new curve 85 div. long. No 1 ExCam 61 DIV IN.CAM 57 DIV Angle between cams 114º 11º I.E 56 EX No.2 EXCAM 61 DIV IN.CAM 61 DIV angle between cams 120º 12º I.E 62b No3 12 8 60 56 Timing diagrams based on start and finish of heavy accelerations equivalent to .013 tappet clearance. We expect with open exhaust, 3000 RPM., to equal at least 85 BHP. i.e. 100 BHP., with good car running conditions. and possibly 95 with 5.5 comp. ratio, and 3250 RPM., say 105 BHP., with sports conditions. BACK AXLE. Hypoid back axle on purpose to get the floor low. BRAKES. Stiffer brake drums with swivelling tips. ENGINE.HEAD. The special cast iron head for this engine has two lots of free ports suitable for a shorter induction system, and two single carburettors. We are very pleased to hear that there is no need to alter the system of exhaust from that used on -.2. head which was adopted because it was tested on the old 20HP. as being efficient, and was the simplest that could be devised. cont'd. {John DeLooze - Company Secretary} | ||
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).