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 performance data comparing runs with and without an air heater, and a discussion on cold air intake design.
| Identifier | ExFiles\Box 123\1\ scan0102 | |
| Date | 26th August 1936 guessed | |
| -4- Engine run without Air Heater R.P.M. H.P. Fuel Pints per hour Pints per B.H.P/hour 1000 10 5.5 .55 2000 21.4 11. .515 3000 30.4 15. .495 4000 37.2 19.75 .585 Engine run with Heater fitted Sleeve in full cold position with no heat R.P.M. H.P. Pints per hour Pints per B.H.P/hour. 1000 10.15 5.5 .545 2000 21.7 12.7 .585 3000 31.7 15.6 .495 4000 37.65 20.5 .545 From these results it can be seen that a very good air cleaner can be designed which will not reduce the h.p. and which in fact should increase same. Cold Air Intake It is essential that cold air must be obtained from outside the bonnet as the air temperature under same can easily be in the region of 150°F.{Mr Friese} to 160°F.{Mr Friese} a condition which will lead to great loss of power and bad pinking and heavier fuel consumption. On the other hand, during the winter the under bonnet temperature may vary between very wide limits. The writer intends to obtain figures of this as soon as the wintry weather sets in. [Footer, upside down] CONTINUATION NO. S. SMITH & SONS (Motor Accessories) LTD. CRICKLEWOOD WORKS, LONDON, N.W.2. R.P.81 | ||