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).
Comparing the combustion chamber and engine performance of two car models.
| Identifier | ExFiles\Box 180\M3\M3.4\ img019 | |
| Date | 1st September 1924 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H.D. -2- Expt. No. REF Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG8. 9. 24. EXPERIMENTAL REPORT. Now in these two tests the shape of the combustion chamber was identical: in our case, though we have not altered the compression ratio quite so much, we have very much reduced the area of the surface exposed in the combustion chamber so that we must expect an additional gain in (b) and (c) due to this fact. It would therefore appear reasonable to suppose that the amount of total heat available lost by the E.A.C. to the cooling water will be some 2% less than the corresponding heat lost by the 40/50 HP. In addition, the petrol consumption of the EAC. car on the road should be better than that of the 40/50 HP. due to a smaller throttle opening being required for a given speed. This means that in the case of the EAC. the total heat available will be less than in the case of the 40/50 HP. Therefore, we expect the former car to be substantially better off for cooling under working conditions for it calls upon the radiator to dissipate a smaller percent of a smaller total than the present 40/50 HP. model. HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} There's a flaw in this argument! | ||