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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).
Comparative table of five different engine construction types, analyzing weight, cost, and design remarks.

Identifier  ExFiles\Box 134\2\  scan0103
Date  16th February 1937 guessed
  
COMPARED TO PRESENT PRODN.

TYPE
(1) PRESENT CONSTRUCTION, BUT USING DIE CASTINGS IN Z3 ALLOY FOR ALL ALUM: PIECES INCLUDING C/C TOP HALF.
(2) WET LINER, INTEGRAL ALUM CONSTRUCTION, ALUM HEAD. ALL DIE CASTING IN Z.3 EXCEPT FOR HEAD.
(3) As (2) BUT WITH C.I. HEAD.
(4) INTEGRAL C.I. CONSTR: C.I. HEAD.
(5) HIGH POWER HEAD ENGINE WITH ALUM HEAD, INTEGRAL BLOCK & C/C TOP HALF IN C.I. WITH LOWER JOINT FACE RAISED FOR LIGHTNESS. ALL ALUM Z3 DIE CASTINGS EXCEPT HEAD.

WEIGHT
SAME
100 LBS. LIGHTER
60 LBS. LIGHTER
90 LBS. HEAVIER
55 LBS HEAVIER

COST OF CASTING
£10 LESS
£12/- MORE
£2/1 MORE
£6/7 LESS
£3/10 LESS

REMARKS.
HEAD CASTING IS TOO CRAMPED TO GIVE CONSISTANT WATER CIRCULATION WITH INCREASED PORT SIZES.
4" LONGER, MAKING FRAME & BONNET 12 LBS HEAVIER & 13/6 MORE EXPENSIVE. VALVES .050 MORE DIA: THAN PRES: CAN BE USED.
THIS IS 1 1/2" LONGER. VALVES .120 MORE DIA: THAN PRES: CAN BE USED IF MOUTH OF COMB: CHAMBER IS LENGTHENED.
SAME LENGTH AS STD: ENGINE. REMARKS IN I APPLY.
SAME LENGTH AS STD. ENGINE. WILL ACCOMODATE 1.800 DIA: INLET VALVE. (PRES: STD: 1.600 DIA:)
  
  


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