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).
Engine cooling, bonnet ventilation and carburetion for the Spectre model.
| Identifier | ExFiles\Box 173\1\ img030 | |
| Date | 5th January 1934 guessed | |
| reasonably warm. Could we see. (a). If a warm intake air will improve matters (b). How many loures have to be blanked off to raise bonnet temp appreciably I am sure with the large Marston matrix that we are at present using we have a margin of cooling at top speed even without bonnet ventilation, but we may require the latter for idling. With regard to SpectreCodename for Phantom III carburetion; if the Induction port centres are as on the Bentley I can see little chance of ever using a single carb without a long up take or down take and a very hot spot. I'm sure it will be worth our while to reproduce exactly (by tilting the engine if necessary) the induction system that E has drawn for the SpectreCodename for Phantom III to make sure there is no snag. I had anticipated carbs on one bank between 2+3 & 4+5 and on the other bank between 1+2 and 5+6. but E | ||