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).
Specification for the Stromberg Carburetter for the 20/25 model, detailing part dimensions and an initial manufacturing agreement.
| Identifier | ExFiles\Box 20\9\ Scan129 | |
| Date | 27th March 1936 | |
| To By.{R.W. Bailey - Chief Engineer} c. to Sft.{Mr Swift} c. to E.{Mr Elliott - Chief Engineer} c. to Mr. Fisher. c. to Roy.{Sir Henry Royce} X1033 Hs{Lord Ernest Hives - Chair}/Em.21/KW.27.3.36. Stromberg Carburetter for the 20/25. D.C.42. LeC.4883. In order to enable the Works to proceed with the manufacture of the big bore 20/25's, we have agreed a specification for the first 100 Carburetters with Mr. Fisher of the Zenith Carburetter Co. It must be appreciated that the 15,000 miles test is still proceeding on these carburetters, and a certain amount of trouble is being experienced which may lead to modifications in the final carburetter specification. 1 1/4" diameter choke. Main metering jet .062". Bypass jet .030". Main discharge tube L.885 with single feed hole 56. Idle tube jet 64. Pump jet 70 when set on minimum stroke. Air bleed 70. Seating .130. Petrol level .625". Torsion spring for the unbalanced choke (sample herewith). Hs{Lord Ernest Hives - Chair}/Em. | ||