List of modifications to a carburettor, including details of the idle system, choke, and float chamber.
| Identifier | ExFiles\Box 122\3\ scan0010 | |
| Date | 16th May 1938 | |
| -2- (6) Idle system modified to Rm. {William Robotham - Chief Engineer} 467. Details - (a) Idle jet tube 70# fuel and 60# vertical air. (b) 40# air feed hole through choke body at 45°. (c) L.1426 floatchamber gasket. (d) Idle hole 56# spot faced outside throttle body. (e) Metering idle screw 1168 (not slot) and spring 1177. (f) Vertical idle passage reduced to .100" dia. (g) Flush fitting blank to air control. (h) Syphon hole not drilled. (7) Choke spindle bearings modified to E.CD.648. (8) Choke torsion spring P.1/068. (9) Floatchamber cover modified to E.61448. Please find enclosed 2 prints ECD.648 and E.61448. With reference to your letter of the 4th inst. we agreed with Mr. Fisher that all modifications to carburettors should be carried out by your goodselves. We have no 30 H.P. carburettors in stock at the works, but there are 16 carburettors which are being returned by production to be modified and all future DC.42 carburettors to be supplied to the above specification. Yours faithfully, FOR ROLLS-ROYCE LTD. | ||
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).