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).
Comparing the performance of a standard 40/50 HP carburetter with a converted EAC carburetter on an EAC engine.
| Identifier | ExFiles\Box 66a\1\ scan0021 | |
| Date | 15th January 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -7- Expl. No. REF. HS{Lord Ernest Hives - Chair}/ACL/LG15.1.25. standard 40/50 HP. carburetter with a higher lift to the air valve because it was found that when the std. 40/50 HP. carb. was used on the EAC. engine, the air valve reached its maximum lift at approx. 1750 r.p.m. full load. This carburetter on the car has similar characteristics as the std. 40/50 carburetter as would be expected. Of course, the power output is lower, (see power curves) than that given by the std. EAC. carburetter as would be imagined from its higher depression, but we entirely get over the trouble of the weakening of the low speed mixture when working at low depression. The following curves are attached :- (1) Power output corrected for N.T.P. for three carburetters. R.R.C.H. Eagle type. Std. EAC. E.72226, and the Converted EAC. carburetter - details of which are given above and print supplied. (2) Metering of the standard EAC. carburetter, Standard 40/50. carburetter, and the converted EAC. carb. for light loads. (3) Do. for full loads. (4) Depression in the mixing chamber of the 40/50 and converted EAC. carburetters on the EAC. engine. We are obtaining curves for air valve lift, depression and mixture quality for these carburetters and will forward same. Hs{Lord Ernest Hives - Chair}/ACL. | ||