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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).
The effect of fuel mixture strength on engine heat flow and power output.

Identifier  ExFiles\Box 22\1\  Scan202
Date  13th October 1924
  
R.R. 495A (SOII) (D.A. 652 30-3-24) J.B.D.
-2-
Expl. No.
REF: HS{Lord Ernest Hives - Chair}/ACL/LG13.10.24.
'EXPERIMENTAL REPORT.

1000 r.p.m. by increasing the mixture strength by 38% from that which just gives maximum torque, the heat flow to the water is reduced by 23%.

Similarly at 2000 r.p.m. an increase in mixture strength of 43% is accompanied by a reduction of 19% in the heat flow.

In both these examples it will be seen that there is no appreciable variation in the power output between the two mixture strengths.

Figures are given expressing the heat flow as a percentage of the heat energy supplied (petrol used) and it will be seen how the fuel consumption influences the heat distribution.

Owing to the fact that a wide range of mixture strengths can be used without any indication being given by the power out-put and running of the engine, it is possible to get varying heat flows for the same condition of load and speed.

The heat flow on curve 1. is that given by a mixture which just maintains maximum power and any reduction in strength would result in a reduction of power.

Note :- During these tests the outlet water temp. was maintained at approx. 90°C. The average jacket temp. being between 82°C and 85°C.

Hs{Lord Ernest Hives - Chair}/ACL.

contd :-
  
  


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