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).
Test report detailing the performance and condition of various engine and electrical components.
| Identifier | ExFiles\Box 5a\2\ 02-page197 | |
| Date | 12th February 1930 guessed | |
| -2- PISTONS E.55576 5.25-1 COMPRESSION RATIO. PISTON RINGS E.55561/2 PER ROY{Sir Henry Royce} CIRCLE.- There has been no knocks audible when starting up from cold and during the running of the car on the road. We have had a momentary knock after the engine had been shut down when hot for a few moments and then restarted. This knock has not lasted more than 2 seconds. As previously stated, there has been no overoiling due to the pistons and rings. Slight wear must have taken place, as we have observed more crankcase pressure lately than at the beginning of the test. This increased crankcase pressure ceases on to oil flow out of the orifice round the fan pulley. SPRING DRIVE TO L.O.P. E.55105.- The functioning of the spring drive and slipper wheel has been normal. There has been no galloping knocks noticeable, and as previously stated, no crankshaft periods. There are slight engine gear rattles in accelerating from low speeds. IGNITION PLUGS. SPECIAL K.L.G. 629 NON CORROSIVE PLUGS FITTED.- We have had no signs of pre-ignitions with these plugs. Slow running has been fair to good. Examination of the plugs shows that the centre electrode has started to burn, the increased gap is a-prox. .021" due to this. There has been no sign of plugs becoming oily. INLET PIPE TO L.O.P. E.54373.- The joints of the inlet pipe and the inlet pipe are still O.K. CARBURETTOR TO L.O.P. E.54492. incorporating; Breather in Pipe Intake modified to Ex. 4547 to cure oil leaks from crankcase. Modified High Speed Choke Tube to V.625. Low Speed Choke Tube to V.710. Suction Chamber Spring to V.711. Later forte in Air Valve to V.631. Aluminium Piston to Ex. 4501.- During the first part of the test, we had slight trouble with the scoring of the aluminium piston. The fit of this had been too good. After carefully removing the score marks, and a general easing of the piston, we have not had any further seizures. The carburettor, after being reset and tuned up, has given entire satisfaction. STARTER MOTOR. STANDARD.- The starter motor has functioned correctly each time it has been operated. IGNITION COIL L.I.7 wound on tube, with parallel secondary winding. Distributor with modified contact point arm.- We have not had any sign of the coil failing. The contacts are in good condition, they show no sign of burning, and have remained quite firm. GENERATOR. DYNAMO WITH 48 COIL ARMATURE FITTED WITH BAKELAQUE INSULATOR.- The general quietness of the dynamo is very good. The output is considerably better. A chart of the output has been sent. The commutator and brushes are in good condition. HIGH TENSION WIRES. CELLULOSE LACQUERED CAMBRIC COVERED MACONITE H.T. CABLES.- These are not a good proposition. The lacquered cambric has cracked round in circles the whole length of the exposed wires. We do not consider the cable to be as good as the standard cable at present used. WATFORD R.W.1. MAGNETO N° 180.280.- Half the mileage has been run on the magneto. Detonations are more pronounced when running on the magneto than | ||