Rolls-Royce Archives
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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 balance weight scheme for a 25 HP shaft.

Identifier  ExFiles\Box 137\4\  scan0335
Date  1st May 1931 guessed
  
8 BALANCE WEIGHT SCHEME FOR 25 HP. SHAFT
E.55619 (big pin).
All balance weights set at 180° to position of crankpin.
Nos. 1, 6, 7, 12 of 1 unit such to balance 1/2 of the out of balance per crank of crankshaft only.
Nos. 3, 4, 9, 10 opposite cranks 2 and 5 to be 1/2 unit or balance 1/4 of the out of balance per crank.
1
1o
1 unit
1/2 unit
1 and 6
2 units
3 and 4
2 units
2 and 5
2 units
No.1 to balance shaded area.
  
  


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