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).
Report page comparing the temperature performance of a standard exhaust heated system against a water heated system, including a graph of working temperatures at full throttle.
| Identifier | ExFiles\Box 66a\1\ scan0093 | |
| Date | 2nd February 1926 guessed | |
| contd :- -8- to either of the other two. Further tests we have made are given later - these go to prove that the temperature rise of the standard exhaust heated system is greater than the other two, also that its normal working temperature is higher. We have further shown by experiment that this proves to be a definite advantage. NORMAL WORKING TEMPS. AT FULL THROTTLE. We here supply curves which show a comparison of the average temperatures of the heating mediums in the hot spot of the standard exhaust and water heated systems. In this case the standard system had the exhaust butterfly throttle wide open :- [Graph] Title: AVERAGE WORKING TEMPERATURES AT FULL THROTTLE Y-Axis Label: AVERAGE TEMP °F Y-Axis Values: 0, 200, 400, 600 X-Axis Label: R.P.M. X-Axis Values: 750, 1000, 1500, 2000 Series 1 (dashed line): STD EXH HEATED HOT-SPOT Series 2 (solid line): SIMPLE WATER HOT SPOT [/Graph] We see from this curve that at 1000 r.p.m. the temp. of the exhaust is lower (45°C) than when running light at the same speed with the exhaust butterfly shut. The table below shews the induction pipe temperature for the above conditions :- contd :- | ||