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).
Comparison table of performance metrics for various engine cylinder configurations.

Identifier  ExFiles\Box 31\2\  Scan092
Date  14th July 1933 guessed
  
Side Header: B.H.P. CORRECTED TO 63¾" AND 15" DEPp

Main Column Headers: 40/50, CHINA, J.I., PEREGRINE, J2, J3, KESTREL IB
Sub-Column Headers: (40/50: SHORT DURATION, LONG DURATION), (J.I.: CHINA C'SHAFT), (PEREGRINE: LARGE VALVE, SMALL VALVE)

Row Data:
SWEPT VOL. PER CYL.: 1280, 1280, 612, 612, 612, 394, 394, 680, 744, 1770
VALVE LIFT: .480, .480, .400, .400, .400, .335, .335, .400, .400, .463
VALVE AREA PER LITRE: 2.11, 2.11, 2.23, 2.37, 2.37, 2.69, 2.37, 2.30, 2.10, 2.35
AREA VALVE LIFT CURVE ☐": 64.50, 69.38, 56.27, 56.27, 61.55, 49.94, 49.94, 59.70, 59.70, 76.71
INTEGRATED AREA. PAST VALVE ☐" MINS/LITRE: 1.05 AT 2850, 1.05 AT 3050, 1.05 AT 3750, 1.05 AT 3850, 1.05 AT 4200, 1.05 AT 4500, 1.05 AT 4200, 1.05 AT 3750, 1.05 AT 3450, 1.05 AT 4200
MEASURED MAX. B.H.P: 140 AT 2800 4.7 C/R, 180 AT 3250 5.25 C/R 250lbs, 109 AT 3750 6.8 C/R, , 114 AT 4000 1.5 Depn, 77 AT 4250, 72.5 AT 4000, 102 AT 3750 5.5 C/R, 111 AT 3400, 630 AT 5000 7C/R 18"DN
COR. B.H.P./ON LITRES ⅔: , 288, 252, , 264, 236, 222, 232, 238, 347
COR. B.H.P. VALVE AREA: , 73.0, 75.0, , 78.8, 72.0, 77.5, 68.5, 74.1, 73.5
VALVE AREA LITRES ⅓: 230, , , , 202, 198, 173, 201, 190, 285
OPTIMUM SPEED LITRES ⅓: .352, , .320, , .348, .312, , .330, .310, .363
STROKE BORE: 1.29, 1.29, 1.37, 1.37, 1.37, 1.51, 1.51, 1.54, 1.47, 1.1
VALVE AREA PISTON AREA: .19, .19, .164, .164, .175, .182, .151, .188, .172, .212
B.H.P. LITRE: 25.6, , , , 31.2, 32.3, , 26.4, 25.9, 28.9
  
  


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