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 motor cars.
| Identifier | ExFiles\Box 29\3\ Scan280 | |
| Date | 1st January 1929 | |
| TABLE HEADERS: COLUMN 1: TYPE OF CAR, DISPLACEMENT, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED COLUMN 2: DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM COLUMN 3: TYPE OF TOP MATRIX TANK DIMENSIONS COLUMN 4: FAN AND DRIVE COLUMN 5: DIRECT DRIVE RATIO AND EFFECTIVE TYRE CIRCUMFERENCE COLUMN 6: BONNET VENTILATION AND DISPOSITION OF UNDERSHIELDS COLUMN 7: MIXTURE DISPLACEMENT PER TON PER MILE COLUMN 8: MIXTURE DISPLACEMENT PER MILE COLUMN 9: FACE AREA PER 1000 LITRES DISP. PER MILE ▢" COLUMN 10: VOLUME PER 1000 LITRES DISP. PER MILE INS³ COLUMN 11: TOP WATER TEMP ATTAINED CONST. SPEED 60 M.P.H COLUMN 12: LAP SPEED M.P.H TABLE DATA: ROW 1: - 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 ▢", VOLUME 1320 INS³, WATER CAPACITY 7 GALLS - TANK: ZIG ZAG RIBBON WITH INDIRECT FINS - FAN: 4 BLADED, CRANKSHAFT SPEED, CANVAS RUBBER BELT - DRIVE RATIO: 4.45-1, TYRE ROLLING CIRC. 30 LBS/▢", 91.50 - VENTILATION: BONNET VENTILATED WITH 9 HORIZONTAL LOUVRES PER SIDE 41.5" LONG. 12" ABOVE MATRIX FREE FROM OBSTRUCTION. CYL. BLOCK 6 & 8" FROM MATRIX. - MIXTURE/TON/MILE: 4070 - MIXTURE/MILE: 7625 - FACE AREA: 63.0 - VOLUME: 173 - TEMP: 85°C AT 53 MPH, ENGINE PERFORMANCE UNSATISFACTORY - LAP SPEED: 67 M.P.H ESTIMATED ROW 2: - CAR: HISPANO 1927, 2 SEATER COUPE, DISP 6597 C.C, WT. OF CAR 5160 LBS, 2.30 TONS - MATRIX: DEPTH 4.00", AREA 530 ▢", VOL 2120 INS³ - TANK: ZIG ZAG RIBBON WITH INDIRECT - FAN: 4 BLADED FAN, 9" LONG - DRIVE RATIO: 3.365-1, 106 AT 50LBS/▢", HIGH PRESS TYRES FITTED - VENTILATION: NO UNDERSHIELD VENTILATION, BONNET VENTILATION 20 LOUVRES PER SIDE 14.5" LONG - MIXTURE/TON/MILE: 3,000 - MIXTURE/MILE: 6860 - FACE AREA: 77.2 - VOLUME: 309 - TEMP: 74°C - LAP SPEED: 85 M.P.H C.O. OPEN ROW 3: - 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", 390 ▢ INS, 1318 INS³ - TANK: VOL 114 CU INS, FIN & TUBE, MATRIX TUBE PITCH .5" - FAN: 4 BLADED FAN, BLADES 8.5" LONG, 1.75" FROM RAD:, DRIVEN BY FLAT CANVAS RUBBER BELT 1.5" WIDE OFF WATER PUMP SHAFT - DRIVE RATIO: 3.643-1, TYRE CIRCUM AT 30 LBS/▢", 91.0 - 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/TON/MILE: 3260 - MIXTURE/MILE: 6,000 - FACE AREA: 65.0 - VOLUME: 220 - TEMP: 77°C - LAP SPEED: 71.66 M.P.H ROW 4: - 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 ▢", VOL 1246 INS³ - TANK: 4.75 DEEP, ZIG ZAG RIBBON WITH INDIRECT, VOL 310 CU: INS: - FAN: 6 BLADED FAN, BLADES 10" LONG, 1" FROM RAD:, FAN DRIVEN AT ENGINE SPEED BY CANVAS RUBBER BELT WHICH ALSO DRIVES WATER PUMP & DYNAMO - DRIVE RATIO: 4.5-1, GOODRICH 7"x18", CIRCUM @ 30 LBS/▢" 93", WATER CAPACITY 3.25 GALLS - VENTILATION: 2" DIA HOLES, BONNET 4 SHUTTERS / SIDE, 7"x4" APPROX. - MIXTURE/TON/MILE: 4,150 - MIXTURE/MILE: 9630 - FACE AREA: 54.4 - VOLUME: 129 - TEMP: 82°C - LAP SPEED: 69.5 M.P.H ROW 5: - CAR: CHRYSLER 75, 5 SEATER SEDAN, 3657 LBS, 1.63 TONS, 4075 CC DISP, COMP RATIO 5-1 - MATRIX: DEPTH 2.5", FRONT AREA 458 ▢", VOLUME 1146 INS³ - 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: 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/▢" - VENTILATION: UNDERSHIELD COMPLETE TO WITHIN 3.0" OF THE DASHBOARD. UNDERSHIELD CLEAR GAP OF 80 ▢" EACH SIDE FOR AIR TO GET AWAY. NO GEARBOX UNDERSHIELD. LOUVRES 13 1/2" LONG 20 PER SIDE. - MIXTURE/TON/MILE: 3,410 C.C, LATEST 77 CHRY, 3590 - MIXTURE/MILE: 5540 - FACE AREA: 82.7 - VOLUME: 207 - TEMP: 75°C - LAP SPEED: 66.9 M.P.H ROW 6: - CAR: ROLLS ROYCE 40/50, 7 SEATER CABRIOLET, 7668 CC DISP, WT. 5400 LBS, 2.41 TONS, RATING 44 H.P., COMP RATIO 4.6-1 - MATRIX: DEPTH 4.0", FRONTAL AREA 630 ▢", VOLUME 2520 INS³ - 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: FAN BLADES 11" LONG, LEADING EDGE 1.5" FROM RAD:, FAN DRIVEN AT ENGINE SPEED - DRIVE RATIO: 3.727-1, EFFECTIVE CIRCUM 102.5 - 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. AIR EXIT UNDER DASH OBSTRUCTED ON N.S BY MAG & ENGINE FOOT O.S BY CARB. OIL FILLER HORN & PETROL FILTER. - MIXTURE/TON/MILE: 3,670 - MIXTURE/MILE: 8850 - FACE AREA: 71.2 - VOLUME: 285 - TEMP: NOT YET ACCURATELY RECORDED - LAP SPEED: 82.5 M.P.H C.O. OPEN ROW 7: - CAR: ROLLS ROYCE 25 H.P., 6 SEATER CAB., 3669 C.C. DISP, WT. 3880 LBS, 1.73 TONS, RATING 20 H.P., COMP RATIO 5.25-1 - MATRIX: DEPTH 3.700, FRONTAL AREA 4.57 ▢", VOLUME 1695 INS³, E.{Mr Elliott - Chief Engineer} 55062 - TANK: WATER CAP RAD 3.375G, TOTAL WATER CAP SYSTEM 4.685GAL, TOTAL VOL APPROX, TOP TANK 233 CU: INS: - FAN: FAN BLADES 9.00" LONG, FAN DRIVEN 1.23 TIMES ENGINE SPEED - DRIVE RATIO: 4.545-1, EFFECTIVE CIRCUM 96.0" - 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/TON/MILE: 3,175 - MIXTURE/MILE: 5500 - FACE AREA: 83.0 - VOLUME: 308 - TEMP: 71°C - LAP SPEED: 64 M.P.H | ||