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).
Preliminary report on the engine performance of Phantom III experimental car 35-EX after testing in France.
| Identifier | ExFiles\Box 113\4\ scan0065 | |
| Date | 1st February 1937 | |
| #B. 1002 Rm{William Robotham - Chief Engineer}/GWH{George W. Hancock - Head Chateauroux}/IMW{Ivan M. Waller - Head of Chateauroux}/I/JAB. 25 RUE GIDE LEVALLOIS-PERRET. Seine, France. 1st. February 1937. To Sg.{Arthur F. Sidgreaves - MD} c. Hs.{Lord Ernest Hives - Chair} c. Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} PRELIMINARY REPORT ON 35-EX. - PHANTOM III. Total Miles in France 408 ENGINE. The performance was found to be equal to a good 4.¼ litre Bentley. The rough period at 75 MPH. which came up badly at Derby was still present to a small degree. Starting, idling, slow running, and pick-up, were excellent. The acceleration in top gear at medium speeds seemed to Sr. better with the four port heads than their standard Phantom III. cars. The tappets remained quieter than standard Bentley, but more time had to be spent on adjustment to achieve this than would be practicable on service, and a camshaft giving greater lattitude is required, and is we understand, being prepared. The plugs in the rocker pedestals have been removed as instructed, to reduce the flow to the rocker bushes. The fan belt has stretched badly and required considerable adjustment. This was anticipated with the single belt drive to the Cadillac fan. The oil pressure fell to 20/lbs/sq." on L.H. curves, and to 10 lbs/sq." on L.H. corners. There was no drop on R.H. turns. There is a piston knock when cold on cylinder A.6. Sticking of the accelerator was experienced and it was found that the rod between the pedal and the cross shaft was rubbing where it passed through the frame. This was set correctly and no further trouble was experienced. With the oil temperature at 88°C. outlet, and 80°C. inlet, the pressure was 7 lbs/sq." at 10 MPH. and 30 lbs/sq." at 70 MPH continued | ||