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).
Modification to the Wraith III cylinder head to create a venturi shape in the inlet ports.
| Identifier | ExFiles\Box 8\6\ 06-page21 | |
| Date | 11th January 1938 | |
| WDO C.c. Hm.{Capt. W. Hallam - Head Repairs} c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. RHC{R. H. Coverley - Production Engineer}/VIG. Pile BY/Ald.{F. Allwood - Experimental Design}9/G.11.1.38. 619 CYLINDER HEAD - WRAITH 111. SECTION 3050. Please receive herewith two blueprints of the following :- Ex.S.357 Modification to Cylinder Head. 1 off. This drawing shows the inlet ports modified to a venturi shape as called for on Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}B/MH.{M. Huckerby}6.1.38. No pattern work is required, but the cores should be rubbed down to produce the taper throat, as arranged with RHC{R. H. Coverley - Production Engineer}/VIG. This will, of course, leave the metal thicker than standard around the port. Kindly instruct one set. BY/Ald.{F. Allwood - Experimental Design} ald{F. Allwood - Experimental Design} | ||