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).
Engine testing procedures including crankshaft oscillation, power curves, and oil consumption for B.80 units.
| Identifier | ExFiles\Box 155\2\ scan0301 | |
| Date | 6th March 1939 guessed | |
| -2- Before commencing the above at item (c), the head gasket should be examined to note that it is in good condition, as these tests are for comparison of existing cooling of exhaust valves compared with No. 3 Unit, which has raised water jackets around the valve bosses. (f) Fit crankshaft torsional oscillation indicator shaft and check crankshaft amplitude, both with the damper and without. The latter should be obtained both sides of the period, up to the point where it becomes dangerous to run the indicator. In order to carry out the oscillations above the period, the engine should be run through the period "light" at 4000 RPM, open to full throttle, keeping the engine to this speed by the brake. Bearings should be taken coming down on the brake, until the oscillating becomes too severe to reck the indicator. The same precaution should be taken to slow down, i.e. releasing the load off the brake, before coming down through the period. Further tests on the crankshaft periods to be carried out by J.R. Spooner. B.80 No. 1. This unit is being assembled for installation in 11 B.V. chassis. Test should consist of :- (a) Power curve. (b) Oil consumption for 1 hr. at 4000 RPM. (c) Ignition characteristic should be OK at TDC setting and should be checked, also noting whether any detonations on "Red-line" (d) Unit to be turned up generally, ready for fitting in chassis, including watering of carburetter with AC petrol. Oil pump in action, and water leaks to be cured. Idling to be set and note that it is free from overoiling after idling for 10 minutes. Gears to be quiet. B.80 No. 3 Unit. New unit incorporating the following special features :- 2.75 diameter journal crank with Vandervell bearing to suit. Cont'd.{John DeLooze - Company Secretary} | ||