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 for the 40/50 HP Winter Carburation system, particularly regarding performance at full throttle when cold.
| Identifier | ExFiles\Box 50\3\ Scan202 | |
| Date | 3rd November 1921 | |
| To Hs. {Lord Ernest Hives - Chair} from R. {Sir Henry Royce} c. to CJ. c. to Wor. {Arthur Wormald - General Works Manager} c. to BY. {R.W. Bailey - Chief Engineer} c. to Da. {Bernard Day - Chassis Design} X4305 R6/G3.11.21. X.4305 - RE 40/50 H.P. WINTER CARBURATION. X.4390 You have not yet informed us of what modifications you had to make in the exhaust heated throttle design which we sent you. We presume that the uneven distribution occurred when attempting to run the engine under the usual troublesome conditions of full throttle cold at slow speeds. It has occurred to me that with the starting carburetter as arranged upon the induction pipe(moving throat type) the engine could easily be run long enough on this carburetter to warm up the throttle, sufficiently to run quite satisfactorily even at full throttle slow speed with poor petrol. R. {Sir Henry Royce} | ||