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).
Carburettor testing results and recommended modifications for increased performance.
| Identifier | ExFiles\Box 93\2\ scan0080 | |
| Date | 6th September 1935 | |
| -2- Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}25/KW.6.9.35. A set of the old type of carburetters have been tested with the throttles removed, giving a reduction in depression from 2.4" to 1.8" Ins.Hg. at 3750 r.p.m. resulting in a gain of 5 BHP. at this speed, this test being carried out with the suction pistons working in a normal manner. Assuming that the new float pivot positions are satisfactory on the road, the carburetters should include the following features :- (1) Delete the reverse throttle and use original arrangement. (2) Increased throttle bore and induction hole to 1.375" dia. (3) 26 SWG. floats, deleting the stops on the underside of the floats. Include all the modifications as carried out on LeC.4378, 4495, 4548. Hs{Lord Ernest Hives - Chair}/L.H.Swindall. | ||