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).
Analysis of heat added to the engine cooling system, its effect on power and efficiency, and disadvantages of the standard system.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan98 | |
| Date | 14th January 1926 guessed | |
| contd :- -18- HEAT ADDED TO COOLING SYSTEM. With the boiler heating surface used (75.4 sq.in.) heat is added to the cooling system under full load conditions. The maximum value we recorded was 6½% of the heat given to the water by the cylinders. A larger boiler would of course increase this. HOT SPOT EFFECT ON POWER AND EFFICIENCY. The maximum power obtainable at any speed is substantially the same for each system. Better distribution is obtained with the standard and is shown by the wider range of mixture strengths giving smooth operation, consequently greater efficiency can be obtained as indicated by the curves. EFFECT ON DETONATION :- We cannot detect any difference in detonation which ever system is used. DISADVANTAGE OF THE STD. SYSTEM. The only disadvantage that we can see possessed by the standard system is trouble with the exhaust throttle valve which [struck-through word] certainly works under very trying conditions. From our investigations with the superheated system we cannot see that this will possess any advantage not already possessed by the standard system and the disadvantage it has in adding heat to the jacket water, although perhaps during average running of an insignificant amount, would be a vulnerable point at which criticism may be directed should any owner be troubled with over-heating, even though under abnormal conditions. contd:- | ||