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).
Performance of the Phantom II exhaust system and comparing it to a new manifold design for the Japan 1 model.
| Identifier | ExFiles\Box 6\7\ 07-page123 | |
| Date | 19th May 1931 | |
| Y 5230 To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. to Sg.{Arthur F. Sidgreaves - MD} c. to Or. c. to By.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair}1/WJ.19.5.31. JAPAN 1. EXHAUST SYSTEM. Referring to R2/M13.5.31. Phantom 11 exhaust system has given us very little trouble. There are 800 cars on the road and we have only had three cases of exhaust manifold failure. We have run a number of 10,000 mile tests in France without any trouble. The troubles reported in the Quarterly Complaint list are mostly failures of cut-out and sliding joint blowing. We have a manifold made on the lines of Phantom 11 for Japan 1. One of these is being fitted to 16-G4 before it is returned to W.W. As regards power efficiency, we find that even on the unit we have running giving the high power there is no difference in power efficiency with this manifold compared with three separate pipes leading into an expansion box. We put this point forward because the two sets of three means more complications and exhaust joints to keep tight, and very probably would mean more exhaust heating under the bonnet which is very bad for producing hot floor-boards. Hs.{Lord Ernest Hives - Chair} | ||