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).
Design modifications to the carburetter, valve gear, springs, axle, and frame.
| Identifier | ExFiles\Box 79\2\ scan0005 | |
| Date | 15th January 1921 | |
| X.4329 Contd. -2- Extract X.4219 R3/G15.1.21. (5) The carburetter and induction pipe system has been worked out and promises to be very nice, effective, and simple, without much chance of it being wrong, and delaying production. (6) Much of the valve gear is as already sent, and the springs on the valves and the tappets together have been worked out to run the engine at 3300 without leaving the cams. The engine out therefore, to be capable of giving 70 m.p.h. if the windage is kept down. (7) We have modified the front springs, and they are now quite straight (i.e.) without camber, but inclined, the back eye being 1" below the front. This automatically inclines the steering pivots about the correct amount, and allows a simple rear shackle, and fitting like our 40/50 H.P. with stop. We think it will add to the general appearance etc. You will remember the front axle is now 2" deep, and the road wheels have 54" track. There is still proportionately more clearance before bump takes place. Shock dampers should be arranged for as on 40/50. They will be necessary on, this chassis for fast cars, so we ought to be able to fit them when found necessary. (8) I believe I have mentioned it in a previous memo that we have increased the depth of the frame to 6" (drawing left here 10 a.m. this morning) raised it slightly so that it will now be 21" above the ground with 32" tyre and the floor level is 2" higher, i.e. 23" from the ground level. (9) In a drawing we are sending you will find our version of the bevel pinion shaft on the back axle, its bearings, and couplings, and unless you can see a way of improving this (or what it is defective) you can put it in hand. R.{Sir Henry Royce} [Handwritten notes: X.4329 at top, 'Extract X.4219' next to the reference number, 'X.4261' (crossed out) and 'X.4329' next to paragraph 7] | ||