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).
Proposal for testing a 'hot spot' to investigate its effect on fuel economy.
| Identifier | ExFiles\Box 123\1\ scan0066 | |
| Date | 15th November 1940 | |
| Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}3/ET.15.11.40 - 2 - HOT SPOT. This is such an important factor that it is worth while carrying out a full investigation and we have all the necessary machinery for doing this. First we shall carry out the test as laid down in Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}4/ML. 4.10.40. This will give a direct measure of just how much can be got from higher intake temperature, in counterbalancing less induction pipe contact heat. We could then carry out tests on a six cylinder car (with fixed shutters), as follows: Test No.I. - Ascertain correct underbonnet temperatures for fuel economy, i.e. it may be possible further to weaken, to advantage, our two S.U. system, if the underbonnet temperature is raised. This should be done as follows: With adjustable mixture setting from the driver's seat; take constant speed consumptions, with varying air intake temperatures ( by blanking up more and more of the radiator matrix). From this we shall get a curve for each temperature, and one of three things will happen: 1. Difference so small as to be unimportant. 2. Maximum economy will improve with rising temperature indefinitely. 3. There will be an optimum temperature for maximum economy for a given set up. If we get either result 2. or 3. Jnr.{Charles L. Jenner}'s heater should be made, simply to see if it will provide the necessary temperature. Ten tests should then be repeated with the Stromberg system, because bigger differences should be shown owing to the characteristics of the fixed choke and the less emulsified low speed delivery (requiring more efficient hot spot). Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||