Graph and report on engine ignition advance curves and governor design modifications.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan031 | |
| Date | 4th April 1926 guessed | |
| contd :- -3- GRAPH I Y-Axis: FLYWHEEL... Ignition Advance 60° 50° 40° 30° 20° 10° 0 X-Axis: 500 1000 1500 2000 2500 ENGINE R.P.M. Graph Annotations: DELAYED LOW SPEED ADVANCE DUE TO GOVERNOR WTS BEING UNABLE TO LIFT SMALL INNER PISTON (OIL VISCOSITY ADDITIONAL WHEN COLD) MARK MICROXLEY 2-3° INITIAL ADVANCE STANDARD AND T.E.X. LIMIT OF ADVANCE FOR MAX POWER The reason we were unable to reduce the advance at high speeds was because the governor design did not allow us to fit control springs of the necessary rating. We have the strongest springs we can fit with a safe stress. The only alternative was to reduce the governor weights. We considered that this was un-desirable because with the present weights the small inner piston does not commence to lift until 700 r.p.m. We have, however, been carrying out tests with reduced governor weights and a small inner piston of reduced weight. Previously we have not used aluminium for this item because it shewed a greater tendency to stick than brass in the presence of grit. We are now sending this item for a contd :- | ||
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).