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 of cooling system specifications and performance for various automobiles.
| Identifier | ExFiles\Box 32\5\ Scan248 | |
| Date | 1st September 1930 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 PER MILE SQ IN * VOLUME PER 1000 LITRES DISP PER MILE INS^3 * 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 * MATRIX: DEPTH OF MATRIX 2.75", AREA 480 SQ IN, VOLUME 1320 INS^3, WATER CAPACITY 7 GALLS * TOP TANK: ZIG ZAG RIBBON WITH INDIRECT FINS * FAN AND DRIVE: 4 BLADED CRANKSHAFT SPEED, CANVASS RUBBER BELT * DRIVE RATIO: 4.45-1, TYRE ROLLING CIRC. 30 LBS/SQ IN, 91.50 * BONNET: BONNET VENTILATED WITH 9 HORIZONTAL LOUVRES PER SIDE, 41.5" LONG * 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 MPH, 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 * MATRIX: DEPTH 4-00", AREA 530 SQ IN, VOL 2120 INS^3 * TOP TANK: ZIG ZAG RIBBON WITH INDIRECT * FAN AND DRIVE: 4 BLADED FAN 9" LONG. * DRIVE RATIO: 3.365-1, 106 AT 50 LBS/SQ IN, HIGH PRESS TYRES FITTED * BONNET: 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 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 * MATRIX: DEPTH 3-375", AREA 390 SQ IN, VOLUME 1318 INS^3 * TOP TANK: 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 * DRIVE RATIO: 3.643-1, TYRE CIRCUM AT 30 LBS/SQ IN, 91.0 * BONNET: 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 ROW 4: PIERCE ARROW * TYPE OF CAR: PIERCE ARROW, 6 SEATER LIMOUSINE, 3.5" x 5" 8 CYL, WHEELBASE 144", DISP 6300 CC, WT OF CAR 5200 LBS 2.32 TONS, COMP RATIO 5.07-1 * MATRIX: DEPTH 2.375", AREA 525 SQ IN, VOL 1246 INS^3 * TOP TANK: 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. * DRIVE RATIO: 4.5 - 1, GOODRICH 7"x18", CIRCUM @ 30 LBS/SQ IN 93", WATER CAPACITY 3.25 GALLS * BONNET: BONNET 4 SHUTTERS / SIDE, 7"x4" APPROX. 2" DIA HOLES. * 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 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 * MATRIX: DEPTH 2.5", FRONT AREA 458 SQ IN, VOLUME 1146 INS^3 * TOP TANK: 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. * DRIVE RATIO: 3.9 - 1, EFFECTIVE CIRCUM 91.0" @ 30 LBS/SQ IN * BONNET: UNDERSHIELD COMPLETE TO WITHIN 3.0" OF THE DASHBOARD NO GEARBOX, UNDERSHIELD CLEAR GAP OF 8.0 SQ IN 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 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 * MATRIX: DEPTH 4.0", FRONTAL AREA 630 SQ IN, VOLUME 2520 INS^3 * TOP TANK: 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, LEADING EDGE 1.5" FROM RAD., FAN DRIVEN AT ENGINE SPEED. * DRIVE RATIO: 3.727 - 1, EFFECTIVE CIRCUM 102.5 * BONNET: TWO (AND SHORTLY 4) BONNET SHUTTERS AS STANDARD 2 PER SIDE. 10" x 4". 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 ROW 7: ROLLS ROYCE 25 H.P. * TYPE OF CAR: ROLLS ROYCE 25 H.P., 6 SEATER CAB, 3689 C.C. DISP, WT. 3880 LBS 1.73 TONS, RATING 20 H.P., COMP RATIO 5.25-1 * MATRIX: DEPTH 3-700", FRONTAL AREA 457 SQ IN, VOLUME 1695 INS^3, E.{Mr Elliott - Chief Engineer} 55062 * TOP TANK: WATER CAP RAD 3.375 G, 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 * DRIVE RATIO: 4.545 - 1, EFFECTIVE CIRCUM 96.0" * BONNET: 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 | ||