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).
Continued list of engine design requirements with a comparison table against American and European cars.
| Identifier | ExFiles\Box 50\3\ Scan011 | |
| Date | 1st January 1921 | |
| Contd. -2- R7/G13.1.21. (6) Fit extremely hot spot in induction system where liquid likely to impinge. (7) In addition to hot air, it may require hot water in neighbourhood of throttle to maintain heat of induction system during long coasting when no exhaust available. (8) Induction pipes should be of a form to drain back to carburetter. (9) Carburetter should be of the automeatic type, maintaining good spraying jet, to the lowest speed of the engine (and smallest opening of throttle) and give an exactly correct proportion between air and fuel over the whole range of speed and power :- | No. | Present 40/50 HP. | New model. R.R. | Good Amer. cars. | Good European cars. | |-----|-------------------|-----------------|------------------|---------------------| | 1. | No | Yes. | Most. | Some. | | 2. | Yes. | Yes. | Some. | Some. | | 3. | Yes. | Yes. | Some. | Very few. | | 4. | No. | Yes. | Some. | Very few. | | 5. | No. | Yes. | Most. | None. | | 6. | Yes. | Yes. | most. | Very few. | | 7. | Yes. | Yes. | most. | Some. | | 8. | No. | Yes. | most. | | | 9. | Yes. | Yes. | perfect. | | Generally the new American cars are better than our present ones on bad fuel, but we have not yet seen one that is quite satisfactory from all the above points of view, i.e. we hope to & beat them all, but it means work and new arrangements. R. {Sir Henry Royce} | ||