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).
Examination of the hot spot arrangement and carburetter features for the Lincoln Induction System.
| Identifier | ExFiles\Box 126\3\ scan0024 | |
| Date | 1st January 1936 | |
| X 1104 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}17/KW.1.1.36. Lincoln Induction System. We have examined the hot spot arrangement and carburetter on this car, which has the following features. (1) Riser portion is 2.00" deep, consisting of a cast-iron trouser piece between the induction system and the carburetter. This is exhaust heated all around by two feeds, one from each exhaust manifold and apparently relying upon pulsation in each manifold for the heating, there being no outlet. (2) The induction system has two four port branch manifolds, the only balance between the two is where the servo suction pipe connects up to the division wall in the trouser piece, and here there is a slot .5 x .5 approx. There is no heating around the actual induction manifolds. (3) There are no wells in the base of the induction manifolds and no petrol drains. No precautions are taken with regard to the floatchamber vent, the air balance being taken on the floatchamber cover. (4) An insulating washer made of wood, or a composition very similar to wood, 1/2" thick, is used between the trouser piece and the carburetter. (5) The downdraught duplex Stromberg carburetter has 1.3/16" chokes. The actual carburetter air intake is a plain horizontal circular flange, similar to the DA{Bernard Day - Chassis Design}-42 carburetter as used on the 25 HP. This means that the air horn is a detachable piece and is rigged up with the air silencer towards the radiator. (6) The strangler is hand controlled, which in the full rich position locks the butterfly closed. For the first 30° in which the control is moved from the locked position, the actual butterfly is free to open to the corresponding 30° and dependent upon the suction for opening against a light return spring. With the control in the normal running position, the butterfly is locked full open. In addition to the above mechanism, there is a small spring loaded diaphragm in the actual butterfly. Hs{Lord Ernest Hives - Chair}/L.H. Swindall. | ||