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).
Test report comparing the performance of different induction pipe configurations.
| Identifier | ExFiles\Box 75\2\ scan0230 | |
| Date | 10th February 1921 | |
| TESTS - INDUCTION PIPES. All tests taken using Mex Petrol with 20% paraffin added. Engine run at full throttle 500 R.P.M. Range - amount of difference we can obtain on the petrol consumed and still maintain a steady torque - this is not the maximum torque. Weakest maintained - minimum consumption to obtain maximum power. | Type of Induction pipe. | Temp: of water in engine. | Max: lbs. lift. | Weakest maintained pts. per. hr. | Range. Weak. pts. per hr. | Range. Strong. pts. per hr. | Remarks. | |---|---|---|---|---|---|---| | Std. pipe with 1" pipe through the centre, no heat. | 40°C | 110 | 19.5 | 15 | 30 | Will not maintain steady torque owing to bad distribution. | | Same pipe as above with 1" pipe removed. | | | | | | | | Same pipe as above, engine water temperature 80°C | 80°C | 103 | 19.5 | 16 | 26 | This can be taken as a good standard pipe | | Hot spot pipe with deflector in pipe 1.75" dia. branch pipe. | 40°C | 107 | 19.25 | 16 | 27 | | | Hot spot pipe without deflector. | | | | | | Will not maintain steady torque owing to bad distribution with water temp: 80°C same. | We also tried a standard pipe with a throttle which has not been corrected. We found we could not run the engine hardly under the conditions of this test. The point we wish to emphasize is that we have a large number of cars on the road with distribution in that state so that without applying any new parts we can effect a great improvement to those cars by fitting corrected throttles. PS. R.R.M.S.DEPT S.H. R2. 10-2-21 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 3408 | ||