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).
Letter to Zenith Carburettor Co. Ltd. detailing modifications to the Stromberg D.O.42 carburettor.
| Identifier | ExFiles\Box 122\3\ scan0009 | |
| Date | 16th May 1938 | |
| C. TO BY.{R.W. Bailey - Chief Engineer} C. TO O.O. 1033 EXPERIMENTAL DEPT. RM{William Robotham - Chief Engineer}/GR.{George Ratcliffe}3/JH. 16th May, 1938. The Zenith Carburettor Co.Ltd., Honeypot Lane, Stanmore, MIDDLESEX. For the attention of Mr. A.E. Palmer. Dear Sirs, With reference to our print Rm.{William Robotham - Chief Engineer}467, we had a talk with your Mr. Fisher who advised us to keep the air bleed on the top of the low speed jet tube as small as possible consistent with reasonable control. This we have finally decided to be 60# and not 54# as stated on the print. Will you please make a note of this. We give below a complete list of modifications to the Stromberg D.O.42 carburettor for the first 100. (1) Control levers modified to Ew.1098 incorporating E.60626 ball end for the throttle lever. (2) .113 floatchamber needle seating replaces .130". (4) .156" diameter main feed hole replaces .106". (4) Leather accelerator pump piston (strengthened type) replaces brass one. (5) Main metering jet .060 replaces .063. | ||