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 camshafts and nozzle configurations.

Identifier  WestWitteringFiles\S\September1928-October1928\  Scan075
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.
R.P.M. OF ENGINE.
110° CAMSHAFT (NOZZLE FITTED IN INDN PIPE).
PROBABLE CURVE WITH NOZZLE REMOVED (110°).
116° CAMSHAFT.
VALVE TIMINGS. (.020 TAPPET CLEARANCE).
| | 116° CAMSHAFT | 110° CAMSHAFT |
|---|---|---|
| INLET OPENS. | 21° AFTER TDC | 14° AFTER TDC |
| INLET CLOSES. | 45° AFTER BDC | 34° AFTER BDC |
| EXHAUST OPENS. | 36° BEFORE BDC | 34° BEFORE BDC |
| EXHAUST CLOSES. | AT TDC. | 2° AFTER TDC |
  
  


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