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).
Graph comparing engine power curves for a Phantom II with an open exhaust and 5.25:1 compression ratio, testing two different camshaft and rocker setups.

Identifier  ExFiles\Box 17\6\  Scan243
Date  14th June 1934
  
POWER COMPARISONS (PHANTOM II) OPEN EXHAUST. 5.25:1. C.R.

E.82448.CAMSHAFT .480 VALVE LIFT
STANDARD ROCKERS. STD. SEMI-EXPANDING CARB.
(NO INTAKE SILENCER)
TIMING .020 CLCE
IO 2° PTDC EO 49° BBDC
IC 52° PBDC EC 6° PTDC

E.80070.CAMSHAFT. .429 VALVE LIFT
CADILLAC TYPE ROCKERS. LARGE SEMI-EXPANDING CARB.
(NO INTAKE SILENCER)
TIMING .020 CLCE
IO 5° PTDC EO 54.5° BBDC
IC 46° PBDC EC TOC.

B.H.P.
160, 150, 140, 130, 120, 110, 100, 90, 80

IND'N DEPN
Ins Hg.
4.0, 3.0, 2.0, 1.0

R.P.M.
0, 500, 1000, 1500, 2000, 2500, 3000, 3500

MEP(lbs/sq in)
100, 90, 80, 70, 60, 50

VALVES SEATING FULL POWER
POWER DROP VALVE NOT SEATING
  
  


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