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).
Requesting the trial of venturi-shaped inlet valve throats on a Wraith cylinder head.
| Identifier | ExFiles\Box 10\3\ 03-page103 | |
| Date | 6th January 1938 | |
| 654. To By/Ald.{F. Allwood - Experimental Design} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/MH.{M. Huckerby}6.1.38. VENTURI INLET VALVE THROATS FOR TRIAL ON WRAITH. We wish to try venturi shaped inlet valve throats based on the good results obtained on the Single Cylinder unit. Will you please detail the necessary modification to a Wraith cylinder head EW.1296, i.e. we take a new casting and machine to the venturi shape in the solid head. It is intended to use the standard size inlet valve and modify the ports only. In order to get some proportionate shape of Venturi we have some Chevrolet cylinder head drawings which incorporate venturi throats on the inlet valves. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||