Oil pump noise, engine suspension vibrations during testing, and carburettor flow issues.
| Identifier | WestWitteringFiles\G\August1921\ Scan35 | |
| Date | 1st March 1921 | |
| contd. -3- HS {Lord Ernest Hives - Chair} 1/LGS.3.21. ============== extended so that the nut is above the diameter of the pipe. We also recommend that brass nuts should be used on the exhaust pipe studs. Noise from Oil Pump. When the engine is running slowly we can notice a noise from the oil pump. It appears to be the old complaint of the oil being trapped in the teeth. Springfield have informed us that they have found they could overcome oil pump noises if they used gears slightly spiral. We consider this may be worth trying. Suspension of engine. The engine on the test bench is mounted in a similar way to what it will be in the car. When we first ran the engine on the test bench the shaft taking the drive from the unit to the dynamometer was slightly out-of-truth. At high speeds this shaft vibrated. The vibrations caused the front part of the engine to move up and down owing to the deflection of the bars supporting the front end of the engine. We considerably reduced the movement on the front of the engine by bringing the supports for the tubes closer in, and so reducing the length of the tubes. We do not think that this is ever likely to occur on the car, but if one looks at the supports for the engine, it will be seen that any vertical force at the universal joint would be expected to deflect the flexible tubes mounting the front of the engine. Carburetter. We find it is impossible to get sufficient flow per contd:- (upside down text at bottom right: R.R. 236A (100 T) (S.H. 159. 11-8-20) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2800) | ||
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).