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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).
Comparative power test report on Buick type pistons versus standard pistons at constant detonation.

Identifier  ExFiles\Box 134\1\  scan0067
Date  21th December 1937
  
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Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}3/AP.21.12.37

Graph Title: BUICK TYPE PISTONS — FIG: VII
Graph Subtitle: COMPARATIVE POWER AT CONSTANT DETONATION.
Graph Legend:
Standard Pistons C.R.=7.4
Standard Pistons C.R.=6.0
Buick Pistons. C.R. = 7.4

Graph Axes:
Left Y-Axis: B.M.E.P.
Right Y-Axis: IGNITION ADVANCE
Bottom X-Axis: R.P.M.

Graph Stamp: E.D. 10-12-37


are very similar in effect to those obtained on the Bentley. The power obtained from the Buick pistons is definitely down on the standard pistons at the same compression ratio both for maximum power and constant detonation, the Buick pistons being about the same as the standard pistons with a difference of compression ratio of 1.4.

It should be noted on this unit that whilst pre-ignition was present, it was not so severe as on the Bentley, due presumably to the reduced power.

Considering the above results, therefore, whilst it is appreciated that the drop in power which accompanies the Buick type pistons has not been fully explained, results do not [struck through] seem to justify any further investigation, and the job has therefore been dropped for the time being.

Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}
  
  


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