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).
Blueprint graph comparing power losses in old and new exhaust systems.

Identifier  ExFiles\Box 179b\2\  img149
Date  4th October 1932
  
COMPARISON OF POWER LOSSES IN EX. SYSTEMS AS PER RM.{William Robotham - Chief Engineer} PR.{Percy H. Rose} 30
SKETCH HS{Lord Ernest Hives - Chair} 722 FREE SYSTEM E.100625 OTHER SYSTEM E.100464 IMPROVED HEAD E.100520
6.23 C/R INLET VALVE 1.125 THROAT TWO S.U. CARBS.
LODGE SHORT REACH PLUGS

Valve Timing Diagram:
TDC 3
108 1/2
EX. -013 IN
40 39
FORMS E.100361/2
TDF REMOVED

Axes:
B.H.P. (Brake Horse Power)
B.M.E.P. (Brake Mean Effective Pressure)
R.P.M. (Revolutions Per Minute)

Table:
LOSS TO EXHAUST SYSTEM AT 4500 R.P.M
OLD SYSTEM | NEW SYSTEM
COMPLETE SYSTEM | 14.0 | 5.4
FISHTAIL REMOVED | 11.8 | 3.2
SILENCER REMOVED | 7.8 | 1.3

Legend:
① OPEN EXHAUST
② MANIFOLD & DOWNTAKE TO MAIN SILENCER
③ As ② SILENCER FITTED.
④ As ③ FISHTAIL FITTED. COMPLETE SYSTEM.
⑤ OLD SYSTEM Exp Box E.100464
NEW SYSTEM
  
  


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