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).
Proposed modifications to the Wraith III and Bentley III cylinder block to assist the foundry.
| Identifier | ExFiles\Box 132\4\ scan0168 | |
| Date | 1st September 1938 | |
| BY/NS{Norman Scott} c. Rm{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/Swdl{Len H. Swindell} c. RHC{R. H. Coverley - Production Engineer}/SB{Mr Bull/Mr Bannister} c. RHC{R. H. Coverley - Production Engineer}/VS{J. Vickers} 1124- DA.{Bernard Day - Chassis Design}1/G.1.9.38. WRAITH 111 and BENTLEY 111. MODIFICATIONS TO CYLINDER BLOCK TO ASSIST FOUNDRY. Please receive herewith :- E.CD.871 Modifications for Addition of Four Core Holes in top face of cylinder block. Wraith 111 and Bentley 111. This drawing shows the following suggested alterations to the cylinder block requested by RHC{R. H. Coverley - Production Engineer}/VS.{J. Vickers} to further simplify the process of moulding and casting cylinder blocks. (1). The four screwed and conical seated core plugs in the lower face of cylinder block are deleted, and replaced by four .500 diameter unplugged core holes in the upper face of block. (2). The tie-bars between cylinder barrels are deleted. Referring to item (1), to get in the proposed core holes, we have had to alter the cast in struts between top and bottom walls of cylinders adjacent to the cored holes, and further, the water holes communicating with cylinder head are altered in the joint gasket and in the cylinder head, and this will entail alteration to drill jigs and to gasket dies. Will RHC{R. H. Coverley - Production Engineer}/SB.{Mr Bull/Mr Bannister} please investigate this change from production point of view regarding alteration to jigs and relative costs, so that if the alteration is accepted for standardisation by Experimental Department, and is satis-factory to productionit could be introduced as soon as convenient for production chassis. Referring to item (2) the tie-bars were introduced along with the improved coring for cylinder block on the Wraith 111, because we understood at that time, that it would be an advantage as regards venting the water jacket core, to split the core on the centre line of the jacket covers, and in that case the formation of the tie-bars would form no difficulty in the casting operation. The tie bars were intended to reduce the risk of cylinder barrel distortion when tightening the cylinder head nuts. | ||