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).
Power curve graph for a Super Sports Engine, comparing different camshaft configurations.

Identifier  ExFiles\Box 13\2\  02-page015
Date  19th September 1928
  
V423
Power Curve with 116° Camshaft.
Super Sports Engine N° SS{S. Smith}-3.
Comp. Ratio = 4.5
Claudel Hobson Carburettor
Hot Spot in Action (Water at 75°C)
Open Exhaust.
116° Camshaft to E77322.
(N.B. Nozzle E77799 removed from Induction Pipe).
Brake Horse Power.
RPM. of Engine.
116° Camshaft.
110° Camshaft (Nozzle fitted in Indn Pipe).
Probable Curve with Nozzle Removed (110°).
Valve Timings. (.020 Tappet Clearance).
116° Camshaft:
Inlet Opens: 21° after TDC
Inlet Closes: 45° after BDC
Exhaust Opens: 36° before BDC
Exhaust Closes: at TDC.
110° Camshaft:
Inlet Opens: 14° after TDC
Inlet Closes: 34° after BDC
Exhaust Opens: 34° before BDC
Exhaust Closes: 2° after TDC
  
  


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