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).
The particulars and engine performance of a new Daimler car following a trial run.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan311 | |
| Date | 31th December 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hg/LG/RM{William Robotham - Chief Engineer}31.12.25 NEW DAIMLER TRIAL RUN. Particulars of car. Bore 81.5 - Stroke 117. Displacement - 3568 c.c. Axle ratio - worm drive. Limousine body. Springing - semi-elliptic. Car weight - no passengers - 1.952 tons. Direct drive ratio (?) Will be sent later. Compression ratio - 5.28. Sleeve valves. 7 bearing crankshaft. Dual ignition. Common distributor. Steering worm and worm wheel. Front wheel brakes. Direct pedal operation. Tyres 33 x 6 semi-balloon. Displacement per ton per wheel rev. (Waiting for axle ratio) Phantom * * * * * * 10,400 20 HP. * * * * * * 9,600 (wt.30 cwts. --------------------------------- ENGINE. Slow running - good. Very silent with exception of carburetter suction intake which is slightly noisy. Dual ignition, coil and magneto. common distributor with change-over switch on the steering column. One spark plug in centre of cyl.head. Hot air intake off the exhaust pipe. Forced lubrication by gear pump. Seven bearing crank. Temp. control by restricting water circulation. Exhaust very silent at rear of car, but somewhat contd:- | ||