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).
Performance graph comparing large and small valves.

Identifier  ExFiles\Box 13\2\  02-page137
Date  26th August 1931
  
RM.{William Robotham - Chief Engineer} P.15
COMPARISON OF LARGE & SMALL VALVES
4.78 C.R. W.W. 1 1/4" SHAFT LE G.2818
OPEN EXHAUST
NS.{Norman Scott} DEPN.
3000 R.P.M. LARGE VALVES
C DENOTES CLAUDEL 1.90
T TWIN CARB. 1.4 DIA. CHOKE 2.55
B.H.P.
B.M.E.P. LBS./□"
R.P.M.
① INLET VALVE THROAT 2.00 TREPANNED ROUND PORTS
② INLET VALVE THROAT 1.580 30° SEAT Hs.{Lord Ernest Hives - Chair}372
Valve Timing Diagram:
Ex
In
10
5
52
61.8
.013 CLCE.
Graph Curves:
①c
②c
①T
②T
26/8/31
  
  


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