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).
Cracked exhaust pipe, carburetter flooding, and engine performance with a paraffin mixture.
| Identifier | ExFiles\Box 180\M1\1\ img016 | |
| Date | 15th August 1921 guessed | |
| R.R. 365A (100 T(C & S) B. 119. 11-9-16) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2600 Contd... stopped down suddenly. The exhaust pipe evidently cooled down much more quickly than the cylinders; the exhaust pipe cracked with a bang. We think ample clearance should be allowed in the holes on the exhaust pipes. The two centre holes may have only the ordinary amount of clearance. The holes on the end flanges should have ample clearance. As regards the carburetter, by raising the jets we have been able to obtain the flow and to prevent the carburetter from flooding. We are however, going more thoroughly into this and will report again. We assume that with the vacuum tank we shall only have about 8 to 12" head on the floatchamber. We have run the engine with 20% paraffin mixture. With the hot spot working the carburation is good. We would not say it is as good as we hope to get it. Without the hot spot the engine runs unsteadily at 500 R.P.M. full load and misses fire when picking up due to the petrol loading up. Hs.{Lord Ernest Hives - Chair} | ||