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).
Engine detonation issues with new spark plugs and problems fitting a new silencer flange and bracket.
| Identifier | ExFiles\Box 5a\2\ 02-page235 | |
| Date | 23th March 1930 | |
| To: Hs{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer} From G.S.H x5840. Hôtel de France Chateauroux 23/3/30 We have received your letter Hs{Lord Ernest Hives - Chair}/EM/1/AJW1/3/30. We are running on the new type 2 1 829 L.M.J. plug non corrosive. The plugs where obtained from Parkinson, being a set exactly similar to the ones running on the test engine. The present standard K.L.G. plug are K.H. we are trying a set of the present standard K.L.G. to see whether they run better and have any improvements upon the engine. The detonations are now quite impossible for a customer's car, they can be deleted by opening the throttle very steady when accelerating, but if one opens the throttle fully the detonations are very violent and they keep on to 40 50 miles an hour. We have received the silencer flange and bracket for the sliding joint, these have been fitted and we are now running our usual mileage. The parts sent out where all together wrong for our car. The flange had been made to suit the 1.750" diameter pipe. Whereas our pipe had been reduced at silencer head to 1.500". The flange also on our silencer was the 1.500" size we had to get an adaptor made to fit on the exhaust pipe so as to form the sliding joint, the flange sent out had to be re-drilled for the bolt holes closer to the neck of the pipe, we where just able to get the nuts on behind the flange of the silencer. It made the job twice as long as it should have been. The flange of the exhaust pipe at the joint to manifold had again broken when dismantled the pipe to fit the new parts, this flange is tooweak and requires stengthening up. G.S.H. | ||