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).
Modifications to a Phantom car being sent to France.
| Identifier | WestWitteringFiles\N\2July1925-September1925\ Scan101 | |
| Date | 26th September 1925 | |
| ORIGINAL TO CJ. FROM R.{Sir Henry Royce} Copy to - BJ. HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} RE. PHANTOM CAR GOING TO FRANCE. Handwritten: x8430 (crossed out) x8940a x8980 This car should be kept back for the whole of the modifications we intend doing to the steering gear, front axle, as well as the modifications to the engine. They consist of:- (1) Lightening the axle forging, the pivots, the hub, and the brake carrier. It is already fitted with the large worm slow speed steering, and steel trunnion. (2) The engine should have modifications to the overhead oiling consisting of reducing the pressure to a head not exceeding 12". This can be best done by using one only relief valve after the main relief valve, so that there will only be 2 oil pressures instead of 3, and fitting a very light spring on this low pressure relief valve, and allowing the jet for the half time wheels to come out of the same chamber as the rocker oiling chamber. We have suggested also that the overoiling trouble has been proved to be from the overhead valves, that we stop the oil being fed through the rocker lever to the upper end of the inlet valves. I understand this engine will have the lighter flywheel, the later scheme of clutch which facilitates stopping the clutch, and other improvements, such as the lightening of the induction pipe and carburetter. We have sent you in the modifications to the steering a cross steering tube which we think is a valuable modification, by use of a stiff spring in the cross steering tube pressing on 1 1/8" ball pads by a force of 300 or 400 lbs.; and so adding perceptibly to the damping friction, as well as reducing the tendency for this tube to rattle, avoiding the necessity of frequent adjustment. We have not yet found an application for our damped pendulum lever, so that the longitudinal tube will still have to be fitted with the buffer springs. R.{Sir Henry Royce} (Stamped) RECEIVED 28 SEP 1925 | ||