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 motor car cooling system specifications and performance data.
| Identifier | ExFiles\Box 23\4\ Scan026 | |
| Date | 16th October 1928 | |
| DOCUMENT REFERENCE: E.55062 / 16.10.28 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 PER MILE SQ INCH | VOLUME PER 1000 LITRES DISP PER MILE INS^3 | TOP WATER TEMP ATTAINED CONST. SPEED 60MPH | LAP SPEED M.P.H --- CAR: MARMON 8.79 --- Type of Car: 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 SQ INCH, VOLUME 1320 INS^3, WATER CAPACITY 7 GALLS. Top Matrix Tank Dimensions: 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/SQ INCH, 91.50 Bonnet Ventilation: CYL. BLOCK 6 3/8 FROM MATRIX, BONNET VENTILATED WITH 9 HORIZONTAL LOUVRES PER SIDE 41.5" LONG. 12" ABOVE MATRIX ENDS FROM OBSTRUCTION. Mixture Displacement per Ton per Mile: 4070 Mixture Displacement per Mile: 7625 Face Area: 63.0 Volume: 173 Top Water Temp: 85°C AT 53 M.P.H, ENGINE PERFORMANCE UNSATISFACTORY Lap Speed: 67 M.P.H ESTIMATED --- CAR: HISPANO 1927 --- Type of Car: 2 SEATER COUPE, DISP 6597 C.C, WT. OF CAR 5160 LBS, 2.30 TONS, COMP RATIO 5.5-1 Dimension of Matrix: DEPTH 4.00", AREA 530 SQ INCH, VOL 2120 INS^3 Top Matrix Tank Dimensions: ZIG ZAG RIBBON WITH INDIRECT Fan and Drive: 4 BLADED FAN, 9" LONG. Direct Drive Ratio: 3.365 - 1, 106 AT 50LBS/SQ INCH, 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: 77.2 Volume: 309 Top Water Temp: 74°C Lap Speed: 85 M.P.H C.O. OPEN --- CAR: GRAHAM PAIGE --- Type of Car: 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, AREA 390 SQ INS, VOLUME 1318 INS^3 Top Matrix Tank Dimensions: 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/SQ INCH, 91.0 Bonnet Ventilation: UNDERSHIELD WELL VENTILATED WITH LOUVRES & 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: 65.0 Volume: 220 Top Water Temp: 77°C Lap Speed: 71.66 M.P.H --- CAR: PIERCE ARROW --- Type of Car: 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, AREA 525 SQ INCH, VOL 1246 INS^3 Top Matrix Tank Dimensions: 4.75" DEEP, 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/SQ INCH, 93", WATER CAPACITY 3.25 GALLS Bonnet Ventilation: BONNET 4 SHUTTERS / SIDE, 7"x4" APPROX. Mixture Displacement per Ton per Mile: 4,150 Mixture Displacement per Mile: 9630 Face Area: 54.4 Volume: 129 Top Water Temp: 82°C Lap Speed: 69.5 M.P.H --- CAR: CHRYSLER 75 --- Type of Car: 5 SEATER SEDAN, 3657 LBS, 1.63 TONS, 4075 C.C. DISP, COMP RATIO 5-1 Dimension of Matrix: DEPTH 2.5, FRONT AREA 458 SQ INCH, VOLUME 1146 INS^3 Top Matrix Tank Dimensions: 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/SQ INCH Bonnet Ventilation: UNDERSHIELD COMPLETE TO WITHIN 3.0" OF THE DASHBOARD NO GEARBOX. UNDERSHIELD CLEAR GAP OF 80 SQ INCH 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: 82.7 Volume: 207 Top Water Temp: 73°C Lap Speed: 66.9 M.P.H --- CAR: ROLLS ROYCE 40/50 --- Type of Car: 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 SQ INCH, VOLUME 2520 INS^3 Top Matrix Tank Dimensions: TOP TANK VOLUME, N.SCH 2951, 376 CU. INS., WATER CAP RAD 4.55 GAL, TOTAL WATER CAP. OF THE SYSTEM 7.30, CAP OF ENGINE 2.75G Fan and Drive: FAN BLADES 11" LONG, 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: 71.2 Volume: 285 Top Water Temp: NOT YET ACCURATELY RECORDED Lap Speed: 82.5 M.P.H, C.O. OPEN --- CAR: ROLLS ROYCE 25 H.P. --- Type of Car: 6 SEATER CAB, 3669 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 SQ INCH, VOLUME 1695 INS^3, E.55062 Top Matrix Tank Dimensions: WATER CAP RAD 3.375G, TOTAL WATER CAP SYSTEM 4.685GAL, 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: 83.0 Volume: 308 Top Water Temp: 71°C Lap Speed: 64 M.P.H | ||