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).
Specifications for modifying engine parts on a Corniche chassis for high power work.
| Identifier | ExFiles\Box 97\3\ scan0206 | |
| Date | 22th July 1939 | |
| 400c. To By/Ald.{F. Allwood - Experimental Design} from Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}2/MH.{M. Huckerby}22.7.39. CORNICHE. (Super timed) This is to confirm Rm{William Robotham - Chief Engineer}'s request for special parts to be detailed for high power work on the above chassis. Parts should be modified as follows:- Induction pipe. Normal Corniche pipe (1.750 bore) but with inlet branches increased to 1.750 to match larger ports in head. Carburetters. S.U. type H.6. (as Corniche). Cylinder head. Ew.1296 cylinder head to be modified as follows:- (a) Combustion chamber. General shape as shown on Ex.22594A. Capacity to be 85 ccs. (b) Waterways. The main feature of producing the combustion chamber is by raising the floor, which automatically closes up the water space below the spark plug. Special consideration will have to be given to this point as it will not be as easy as it was on the B.II head. Circulation around the combustion space may be increased by deleting any webs which join up to stud bosses etc. (c) Ports. Port area should be increased in the same manner as Ex.22594A but should be slightly larger in size, i.e. 1.750. | ||