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).
Inter-office letter discussing carburation, manifold design, and hot air intake performance.
| Identifier | ExFiles\Box 75\2\ scan0286 | |
| Date | 9th June 1922 | |
| R.R.A. 25 25m. 12-20-20 40849 42758 INTER-OFFICE CORRESPONDENCE ROLLS-ROYCE OF AMERICA, INC SPRINGFIELD, MASS. Oy2 - 9622 June 9, 1922 CONFIDENTIAL Dear Hives: Re: Carburation (Hs{Lord Ernest Hives - Chair}5/G 11.5.22) It is very interesting to hear of your experience with sharp corners in the manifold. You remember I sent you an article about this some time ago, and we tried a manifold with the supply pipe projecting into it at the T, but did not reach any conclusive results. We are very pleased with the vaporizer scheme with return pipes from the boilers, but do not like the idea of the ex-heated throttle because of complication. A supply of hot air to the high speed intake works fine in making the car work well with cold water. It cuts the power down a little, we don't know how much, but less than one would expect, because the air valve still lets in cold air when it opens. It offers the opportunity of using a single hot air intake for low and high speed jets, and thus makes a simpler instead of a more complicated arrangement. The car can be run without any missing or trouble, with the water temperature at 100°F.{Mr Friese}, if the water to the carburetter is disconnected. If the water is left on, the improvement is less because the water keeps the carburetter cool. 102-CE has run 700 miles in very hot weather through hilly country averaging 35 m.p.h. with hot air to the H.S. and L.S. jets, and showed no more tendency to boil than the standard car. It also beat every car on the road with 14 T. axle and 5400 lbs. total load. OY M.{Mr Moon / Mr Moore} Olley | ||