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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).
Specification sheet detailing modifications and weights for engine components like pistons and governors.

Identifier  ExFiles\Box 18\1\  Scan006
Date  9th February 1927
  
12-EA X78240
#8
-2-
RHC{R. H. Coverley - Production Engineer}1/RE.9.2.27.
9.EAC.11.UNIT

Ignition Governor
Modified Cam D.51508 & Shaft E.75518 with sharper taper to facilitate extraction. 4.2.27.

Piston
Set of Maxium Pistons E.75540(4.5 to 1 comp:) otherwise to L.O.P. E.75414. 6.2.27.

Weight of Std. Pedestal type Piston (complete with rings, gudgeon pin (brackets, nuts, bolts etc). - 2.705 lbs.

Weight of Maxium (4% copper) Piston E.75540(complete with rings, gudgeon pin brackets, nuts, bolts etc). - 2.265 lbs.

Difference in Weight - .440 lbs.

Alum:
Weight of Std. Pedestal Piston alone - 1.703 lbs.
" " Maxium (4% Copper) Piston (E.75540 alone). - 1.281 lbs.

Difference in Weight - .422 lbs.

Cylinders
New Cylinders E.70229/30 fitted. 6.2.27.
  
  


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