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).
Design, criticism, and testing of exhaust manifolds for various chassis types.
| Identifier | ExFiles\Box 179\1\ img003 | |
| Date | 13th October 1931 | |
| From E.{Mr Elliott - Chief Engineer} C. to W.H. HS.{Lord Ernest Hives - Chair} P. EXHAUST MANIFOLDS. Referring to your memo. SG{Arthur F. Sidgreaves - MD}16/E21031., designs for improved manifolds for P. 1. chassis of both cast iron and aluminium head types were sent to H.{Arthur M. Hanbury - Head Complaints} on 25. 3. 31., and for the 20HP. and 'China' chassis on 2. 4. 31., to Le CanadelHenry Royce's French residence. We received R's criticisms of these designs and put the required alterations in hand. Some delay occurred in completing these due to staff illness, but the drawings were again seen by R.{Sir Henry Royce} on his return from Le CanadelHenry Royce's French residence, and issued to Derby on 13. 5. 31. with the following instructions: "We send you herewith LeC. 2894. 2896. and 2902. showing improved exhaust pipes for P. 1. and G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2. chassis." "R.{Sir Henry Royce} would like you to make and test LeC. 2896. and 2902. forthwith so that the relative merits of air cooling ribs and sliding glands can be determined on the small chassis, before we proceed with LeC. 2894 for P. 1." We are awaiting Derby's report on LeCs. 2896. & 2902. The type of exhaust manifold most likely to give unfailing service under the most exacting conditions unfortunately has not been possible on RR. models hitherto due to the necessity for carving the pipe to clear sparking plugs or other manifolds, but this is not the case with J.{Mr Johnson W.M.} 3., where up to the moment the only restriction we have is that all the exhaust gas must pass down at the front end. E.{Mr Elliott - Chief Engineer} | ||