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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).
Test data comparing heat flow in clean vs. carbonised engines and between cast iron vs. aluminium pistons.

Identifier  ExFiles\Box 24\4\  Scan097
Date  21th August 1923 guessed
  
SHEET 5. CLEAN AND DIRTY ENGINE - CAST IRON AND ALUMINIUM PISTONS.

EFFECT OF CARBON DEPOSIT ON HEAT FLOW TO COOLING WATER.
COMPRESSION RATIO FOR THESE READINGS 3.9.

TABLE 1:
Headers: Carbonised engine, Clean engine
Sub-headers: R.P.M., HP., Ht. flow to jackets. B.Th.U's. min., HP., Ht. flow to jackets. B.Th.U's. min.
Row 1: 500, 21.87, 1328.4, 23.1, 1660
Row 2: 750, 32.38, 1912.5, 33.6, 2250
Row 3: 1000, 43.5, 2079.0, 45.4, 2970
Row 4: 1250, 53.9, 2608.0, 56.7, 3167
Row 5: 1500, 62.7, 2948.0, 66.2, 3402
Row 6: 1750, 69.6, 3307.0, 74.7, 3780
Row 7: 2000, 73.3, 3664.0, 77.3, 3982

HEAT FLOW WITH CAST IRON AND ALUMINIUM PISTONS COMPARED.

TABLE 2:
Headers: Alum. pistons., Cast iron pistons.
Sub-headers: R.P.M., HP., B.Th.U's. min., HP., B.Th.U's. min.
Row 1: 500, 23, 1475, 22.3, 1413
Row 2: 750, 34, 2025, 34.25, 1925
Row 3: 1000, 45.5, 2300, 45.7, 2310
Row 4: 1250, 55.5, 2780, 57.1, 2745
Row 5: 1500, 67.0, 3060, 67.2, 3100
Row 6: 1750, ----, 3390, 73.4, 3440
Row 7: 2000, ----, 3980, 97.7, 3600

Note :-
Carburtter for each of these readings was the same viz. set for normal running.
  
  


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