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).
Proposal for modifications to the 40/50 HP chassis to improve performance with lower grade petrol.
| Identifier | WestWitteringFiles\F\February1921\ Scan56 | |
| Date | 24th February 1921 | |
| To HS.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} Copy to CJ. " " WOR.{Arthur Wormald - General Works Manager} " " PN{Mr Northey}+ " " DA{Bernard Day - Chassis Design} " " BY " " EP{G. Eric Platford - Chief Quality Engineer} " " HM.{Capt. W. Hallam - Head Repairs} " " R.R. of America Inc. (For the attention of OY.) ORIGINAL. R5/G22/2/21. S4 RECEIVED D 24 FEB 1921 X 985 X 4305 X 3456 RE IMPROVEMENTS TO MEET LOWER GRADE OF PETROL. With reference to the 40/50 H.P. I would like to impress upon you the extreme urgency of giving every attention possible to the above modification on our present 40/50 H.P. chassis, and to study the desirability of offering to make this modification, if we are thoroughly satisfied with it, a standard fitting that can be attached to cars already in existence, at a fixed sum:- (1) A simple and effective hot spot modification to the induction pipe. (2) Hand operated louvres in front of radiator with dashboard thermometer as guide. (3) Fitting of pilot jet so as to give more continuous running at starting, to take the place of the primer. Every effort should be made to get these three modifications on the chassis about to be delivered. I have heard from Mr. Johnson that the Springfield Works had found that a pipe within the induction pipe, heated by the exhaust, made a definite improvement in the carburation. Unless my understanding of it is incorrect, I should say that such a scheme would not be very effective, because we had the impression that the heat must occur at, or before the centre of the trunk of induction manifold. That the liquid petrol was very largely on the inside of the pipe, that after the pipe branched into two the distribution could not be easily corrected if there was any inequality between the front and the back three cylinders, and therefore, unless the central part of (Contd.) S K 523V (100 L) (2 H 'J28' 11-8-20) C. 3500 | ||