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 analysis table of various car specifications and cooling system performance.
| Identifier | ExFiles\Box 125\2\ scan0084 | |
| Date | 9th February 1931 guessed | |
| COLUMN HEADERS: TYPE OF CAR, DISPLACEMENT, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM TYPE OF TOP MATRIX TANK DIMENSIONS FAN AND DRIVE DIRECT DRIVE RATIO AND EFFECTIVE TYRE CIRCUMFERENCE BONNET VENTILATION AND DISPOSITION OF UNDERSHIELDS MIXTURE DISPLACEMENT PER TON PER MILE. MIXTURE DISPLACEMENT PER MILE. FACE AREA PER 1000 LITRES DISP []" VOLUME PER 1000 LITRES DISP INS³ TOP WATER TEMP ATTAINED CONST. SPEED 60MPH LAP SPEED M.P.H ROW 1: MARMON 8.79 Type of Car: MARMON 8.79, SEDAN 5 SEATER, 3 3/16 x 4 3/4, RAC RATING 32.5, DISP. 4960 C.C., WT. OF CAR 4200 LBS, 1.87 TONS, COMP. RATIO 5.5-1 Dimension of Matrix: DEPTH OF MATRIX 2.75, AREA 480 []", VOLUME 1320 INS³, 19.00", WATER CAPACITY 7 GALLS Type of Top Matrix Tank Dimensions: 5", 17.25", 4-5", ZIG ZAG RIBBON WITH INDIRECT FINS Fan and Drive: CANVASS RUBBER BELT, 4 BLADED, CRANKSHAFT SPEED Direct Drive Ratio: 4.45 - 1, TYRE ROLLING CIRC 30 LBS/[]", 91.50 Bonnet Ventilation: CYL BLOCK 6.8" FROM MATRIX, DASH, AIR GAPS, 8-0", BONNET VENTILATED WITH 9 HORIZONTAL LOUVRES PER SIDE 41.5" LONG, AIR GAPS, 12" ABOVE MATRIX FREE FROM OBSTRUCTION Mixture Displacement Per Ton Per Mile: 4070 Mixture Displacement Per Mile: 7625 Face Area Per 1000 Litres Disp: 63.0 Volume Per 1000 Litres Disp: 173 Top Water Temp: 85°C AT 53 M.P.H, ENGINE PERFORMANCE UNSATISFACTORY Lap Speed: 67 M.P.H, ESTIMATED ROW 2: HISPANO 1927 Type of Car: HISPANO 1927, 2 SEATER COUPE, DISP 6597 C.C, WT. OF CAR 5160 LBS, 2.30 TONS. Dimension of Matrix: DEPTH 4.00", AREA 530 []", VOL. 2120 INS³, 20.5" Type of Top Matrix Tank Dimensions: ZIG ZAG RIBBON WITH INDIRECT Fan and Drive: 4 BLADED FAN, 9" LONG. Direct Drive Ratio: 3.388-1, 106 AT 50LBS/[]", HIGH PRESS TYRES FITTED Bonnet Ventilation: No UNDERSHIELD. VENTILATION, BONNET VENTILATION, 20 LOUVRES PER SIDE 14.5" LONG Mixture Displacement Per Ton Per Mile: 3,000 Mixture Displacement Per Mile: 6860 Face Area Per 1000 Litres Disp: 77.2 Volume Per 1000 Litres Disp: 309 Top Water Temp: 74°C Lap Speed: 83 M.P.H, C.O OPEN ROW 3: GRAHAM PAIGE Type of Car: GRAHAM PAIGE, 3.5" x 5", 5 SEATER SEDAN, COMP. RATIO 5.35-1, WHEELBASE 121", DISP 4730 C.C., WT. OF CAR 4124 LBS, 1.84 TONS Dimension of Matrix: DEPTH 3.375, 18", 1390 [] INS³, 31.0 INS³, 17.5" Type of Top Matrix Tank Dimensions: 3.375, 3.75", 4.0", 18", VOL 114 CU INS., FIN & TUBE MATRIX TUBE PITCH .5" Fan and Drive: 4 BLADED FAN, BLADES 8.5" LONG, 1.75" FROM RAD, DRIVEN BY FLAT CANVASS RUBBER BELT 1.5" WIDE OFF WATER PUMP SHAFT Direct Drive Ratio: 3.643-1, TYRE CIRCUM AT 30 LBS/[]", 91.0 Bonnet Ventilation: UNDERSHIELD WELL VENTILATED WITH LOUVRES 3" FINISHES 4" FORWARD OF THE DASH LEAVING A GAP 7" x 14" FOR AIR TO GET AWAY, BONNET 26 LOUVRES 15" LONG SPACED OVER 19.75, ENGINE 10.0" FROM RADIATOR Mixture Displacement Per Ton Per Mile: 3260 Mixture Displacement Per Mile: 6,000 Face Area Per 1000 Litres Disp: 65.0 Volume Per 1000 Litres Disp: 220 Top Water Temp: 77°C Lap Speed: 71.66 M.P.H ROW 4: PIERCE ARROW Type of Car: PIERCE ARROW, 6 SEATER LIMOUSINE, 3.5" x 5" 8 CYL, WHEELBASE 144", DISP. 6300 C.C., WT. OF CAR 5200 LBS, 2.32 TONS, COMP RATIO 5.07-1 Dimension of Matrix: DEPTH 2.375, 13.5", AREA 525 []", VOL 1246 INS³, 20" Type of Top Matrix Tank Dimensions: 4.75" DEEP, 4.0", 18", ZIG ZAG RIBBON WITH INDIRECT, VOL 310 CU. INS. Fan and Drive: 6 BLADED FAN, BLADES 10" LONG, 1" FROM RAD, FAN DRIVEN AT ENGINE SPEED BY CANVASS RUBBER BELT WHICH ALSO DRIVES WATER PUMP & DYNAMO Direct Drive Ratio: 4.5 - 1, GOODRICH 7"x18" CIRCUM @ 30 LBS/[]", WATER CAPACITY 3.25 GALLS Bonnet Ventilation: 2" DIA HOLES, 4'.0", BONNET 4 SHUTTERS/SIDE, 7"x4" APPROX. Mixture Displacement Per Ton Per Mile: 4,150 Mixture Displacement Per Mile: 9630 Face Area Per 1000 Litres Disp: 54.4 Volume Per 1000 Litres Disp: 129 Top Water Temp: 82°C Lap Speed: 69.5 M.P.H ROW 5: CHRYSLER 75 Type of Car: CHRYSLER 75, 5 SEATER SEDAN, 3657 LBS, 1.63 TONS, 4075 C.C. DISP, COMP RATIO 5-1 Dimension of Matrix: DEPTH 2.5, 19.0", FRONT AREA 458 []", VOLUME 1145 INS³, 18.25" Type of Top Matrix Tank Dimensions: 3.375, 4.0", 18.25", TANK EXTENSION BEHIND BONNET, TOTAL TOP TANK VOLUME 273 CU.INS APPROX, WATER IN RAD 2.2 GAL, TOTAL WATER CAP OF SYSTEM 3.5 GAL Fan and Drive: FAN BLADES 8" LONG, LEADING EDGE .5" FROM RADIATOR, FAN 1.3 TIMES ENGINE SPEED Direct Drive Ratio: 3.9 - 1, EFFECTIVE CIRCUM 91.0" @ 30 LBS/[]" Bonnet Ventilation: UNDERSHIELD COMPLETE TO WITHIN 3'.0" OF THE DASHBOARD NO GEARBOX UNDERSHIELD CLEAR GAP OF 80 []" EACH SIDE FOR AIR TO GET AWAY UNDER THE DASH BENEATH FLOORBOARDS NO GEARBOX UNDERSHIELD, LOUVRES 13 1/2" LONG 20 PER SIDE Mixture Displacement Per Ton Per Mile: 3,410 C.C LATEST 77 CHRY, 3590 Mixture Displacement Per Mile: 5540 Face Area Per 1000 Litres Disp: 82.7 Volume Per 1000 Litres Disp: 207 Top Water Temp: 73°C Lap Speed: 66.9 M.P.H ROW 6: ROLLS ROYCE 40/50 Type of Car: ROLLS ROYCE 40/50, 7 SEATER CABRIOLET, 7668 C.C. DISP, WT. 5400 LBS, 2.41 TONS, RATING 44 H.P., COMP RATIO 4.6-1 Dimension of Matrix: DEPTH 4.0", FRONTAL AREA 630 []", VOLUME 2520 INS³, 23.5" Type of Top Matrix Tank Dimensions: 4.00", 23.6", TOP TANK VOLUME N. SCH 2951. 376 CU. INS., WATER CAP RAD 3.9 GAL, TOTAL WATER CAP OF THE SYSTEM 7.30, CAP OF ENGINE 2.75 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Fan and Drive: FAN BLADES 11" LONG, LEADING EDGE 1.5" FROM RAD., FAN DRIVEN AT ENGINE SPEED Direct Drive Ratio: 3.727 - 1, EFFECTIVE CIRCUM 102.5 Bonnet Ventilation: TWO (AND SHORTLY 4) BONNET SHUTTERS AS STANDARD 2 PER SIDE 10"x4", NO VENTILATION BETWEEN RAD & ENGINE. WHEELCASE LOUVRES IN ENGINE SIDE GUARDS 8/SIDE 5" WIDE BUT NOT IN A VERY EFFECTIVE POSITION BEING SCREENED BY THE FRONT ENGINE FOOT AIR EXIT UNDER DASH OBSTRUCTED ON N.S BY MAG. & ENGINE FOOT O.S BY CARB. OIL FILLER HORN & PETROL FILTER. Mixture Displacement Per Ton Per Mile: 3,670 Mixture Displacement Per Mile: 8850 Face Area Per 1000 Litres Disp: 71.2 Volume Per 1000 Litres Disp: 285 Top Water Temp: NOT YET ACCURATELY RECORDED Lap Speed: 82.5 M.P.H, C.O. OPEN ROW 7: ROLLS ROYCE 20 H.P. Type of Car: ROLLS ROYCE 20 H.P., 6 SEATER CAB., 3169 C.C. DISP, WT. 3880 LBS, 1.73 TONS, RATING 20 H.P., COMP. RATIO 5.25 - 1 Dimension of Matrix: DEPTH 3.700", FRONTAL AREA 457[]", VOLUME 1695 INS³, 21.2", 21.6", E.{Mr Elliott - Chief Engineer} 55062 Type of Top Matrix Tank Dimensions: 3.700, 4.75", WATER CAP RAD 3.375 G.{Mr Griffiths - Chief Accountant / Mr Gnapp}, TOTAL WATER CAP SYSTEM 4.685 GAL, TOTAL VOL. APPROX TOP TANK 233 CU. INS. Fan and Drive: FAN BLADES 9.00" LONG, FAN DRIVEN 1.23 TIMES ENGINE SPEED Direct Drive Ratio: 4.545 - 1, EFFECTIVE CIRCUM 96.0" Bonnet Ventilation: NO BONNET VENTILATION FITTED AS STANDARD. NO VENTILATION BETWEEN RAD & ENGINE. WHEELCASE. 6 LOUVRES/SIDE IN ENGINE GUARDS FACILITIES FOR GETTING AIR AWAY UNDER DASH BETTER THAN 40/50 BUT WORSE THAN MOST AMERICAN CARS. Mixture Displacement Per Ton Per Mile: 3,175 Mixture Displacement Per Mile: 5500 Face Area Per 1000 Litres Disp: 83.0 Volume Per 1000 Litres Disp: 308 Top Water Temp: 71°C Lap Speed: 64 M.P.H | ||