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 power testing through various gears and observations on a Packard engine's ignition advance.
| Identifier | ExFiles\Box 37\1\ scan 218 | |
| Date | 25th June 1920 | |
| Contd. -2- Hs{Lord Ernest Hives - Chair}7/LG25.6.20. Whilst we were testing this engine on the Bench as the gearbox was fitted, we tried the HP. on the various gears with the idea of ascertaining what loss there was when driving through the gears. We found that we actually got more power when driving through the gears than we had on direct drive. Below are the figures:- Direct Drive. 2nd. Gear. 1st. Gear. Revs. 1 to 1 5 to 3. 89 to 26. 500 20.4 20.5 1000 40.0 41.0 1500 58.7 60.7 63.8 2000 71.6 74.0 78.8 We cannot give an explanation why it is that when we are measuring torque by means of a water brake, that we get an increase in power when running on the gears. X.3949. A point on the Packard engine which we had not realised before is the fact that there is an automatic advance, as well as the Hand Control for the ignition. As it is arranged the Hand Control gives 29º advance on the flywheel - the automatic advance gives 20º on the flywheel. With the hand Control, both the contact breaker cam and the rotors for the 6-cylinder distributors are advanced but with thw automatic advance only the contact breaker cam is advanced and not the distributor rotors. One can see that it is not necessary on the automatic advance to advance the high tension rotors so contd. | ||