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).
Preliminary tests of an EAC fixed choke type carburetter.
| Identifier | ExFiles\Box 182\M20\M20.3\ img008 | |
| Date | 12th July 1923 | |
| R.R. 493A (60 H) (SL 42 12-7-23). J.H. D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Expt. No. 9080 REF: Hs{Lord Ernest Hives - Chair}/ACL/L.G29524. PRELIMINARY TESTS ON EAC. FIXED CHOKE TYPE CARBURETTER. ------------------------------------------- This carburetter was tested on the EAC. engine but for these preliminary tests no heat was supplied to the vaporiser. The following observations were made :- AIR VALVE. The max. lift of the air valve was .5" which it attained at a speed of 900 r.p.m., and would not increase above this even when tried with a larger suction hole and no spring. The deflector on the air valve was extended by means of a piece of tube carried down round the needle valve holding nuts. This corrected the fault, due apparently to the lower suction in the vicinity of the air ports. (sketch attached). NEEDLE VALVE. Using the standard needle valve, the mixture rapidly became too weak with increase of speed, so this was removed, replaced by a short length of needle to seal the hole in the top of the diffuser tube and an adjustable conical needle fitted through the bottom. By this means the mixture could be regulated at each speed. A spring was fitted to the air valve which allowed it to reach its max. lift at approx. 2250 r.p.m. The attached figures were taken of the power output with silencer and cut-out shut - we also give for comparison contd:- | ||