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 the carburettor, valve gear, suspension, frame, and drivetrain components.
| Identifier | ExFiles\Box 49\1\ Scan262 | |
| Date | 18th January 1921 | |
| X.4286 Contd. -2- Account X.4219 HS{Lord Ernest Hives - Chair}/G18.1.21. (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 tappers together have been worked out to run the engine at 3300 without leaving the cams. The engine ought 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 let here 10 a.m. this morning) raised it slightly so that it will now be 21 1/2" above the ground with 32" tyres and the floor level is 2" higher, i.e. 23 1/2" 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} | ||