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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 table of engine design schemes for camshafts and tappets, outlining the advantages and objections of each.

Identifier  ExFiles\Box 19\3\  Scan027
Date  9th February 1929 guessed
  
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SCHEME | ADVANTAGES. | OBJECTIONS.
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Sch. No.5. BY's suggestion for offsetting tappet instead of camshaft- See LeC. 2662. | Cyl. blocks, heads, timing gears, valve mechanism, all interchangeable. | Timing gears & crank-chamber on present R.H. SS.{S. Smith} would have to be altered, or alternative-ly the camshaft centre lift unchanged and tappets displaced. Tappets require addit-ional feature to ensure correct way round.
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Sch. No.6. Arrange the L.H. engine with the present cam-shaft centre but inclined concentric tappets-R5/M3229.
[Diagram of camshaft and tappets labeled 'LEFT HAND'] | Present R.H. engine would be unaltered. Cyl. blocks, heads, timing gears, all interchangeable. | The L.H. engine would not have the desaxe camshaft and the push-rod would be slightly out of line with the tappet.
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Sch. No.7. This scheme deals with the possibil-ities of including a new feature e.g. oil submerg-ed{J. L. Edwards} camshaft, while and if alterations are being made. R5/M3.2.29. says "it might pay us to leave SS.{S. Smith} as it is & make the L.H. SS.{S. Smith} oil submerged if we cannot alter. our first SS.{S. Smith} to the same.
[Diagram of camshaft and tappets labeled 'LEFT HAND']
L.H. engine with camshaft raised for oil trough sch. | Present SS.{S. Smith} engine left un-altered until suitable oppor-tunity occurs. L.H. engine would have tappets run-ning under oil. Cyl. blocks and heads inter-changeable. | This probably leaves us with only the crankshaft pinion interchangeable in the wheelcase.
  
  


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