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 car models.
| Identifier | ExFiles\Box 5a\5\ 05-page130 | |
| Date | 24th April 1931 guessed | |
| COLUMN HEADERS: TYPE OF CAR, DISPLACEMENT, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED | RAC RATING, DISP, WT OF CAR, COMP. RATIO | DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM, DEPTH OF MATRIX | TYPE OF TOP HATTER TANK DIMENSIONS | TYPE OF 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 SQ INS | VOLUME PER 1000 LITRES DISP CU INS | TOP WATER TEMP ATTAINED CONST. SPEED 60MPH | LAB SPEED M.P.H. ROW 1: MARMON 8-79 Car Details: MARMON 8-79, SEDAN 5 SEATER, 3 3/16" x 4 3/4", RAC RATING 32.5, DISP 4950 C.C., WT OF CAR 4200 LBS 1.87 TONS, COMP. RATIO 5.5-1 Matrix: DEPTH OF MATRIX 2.75", AREA 450 SQ IN, VOL 1210 CU INS, WATER CAPACITY 7 GALLS Top Hatter Tank: ZIG ZAG RIBBON WITH INDIRECT FINS Fan and Drive: CANVAS RUBBER BELT, 4 BLADED CRANKSHAFT SPEED Ratio/Tyre: 4.45-1, TYRE ROLLING CIRC 30 LBS/SQ IN 91.50" Ventilation: CYL BLOCK 0.8" FROM MATRIX, BONNET VENTILATED WITH 9 HORIZONTAL LOUVRES PER SIDE 41.5" LONG, AIR GAPS Mixture per Ton Mile: 4070 Mixture per Mile: 7625 Face Area: 63.0 Volume: 173 Top Water Temp: 86°C AT 53 MPH, ENGINE PERFORMANCE UNSATISFACTORY Lab Speed: 67 M.P.H ESTIMATED ROW 2: HISPANO 1927 Car Details: HISPANO 1927, 2 SEATER COUPE, DISP 6597 C.C., WT OF CAR 5160 LBS 2.30 TONS, COMP. RATIO 5.5-1 Matrix: DEPTH 4.00", AREA 530 SQ IN, VOL 2120 INS³ Top Hatter Tank: ZIG ZAG RIBBON WITH INDIRECT Fan and Drive: 4 BLADED FAN, 9" LONG Ratio/Tyre: 3.385-1, 1.08 AT 50LBS/SQ IN, HIGH PRESS TYRES FITTED Ventilation: NO UNDERSHIELD VENTILATION, BONNET VENTILATED 20 LOUVRES PER SIDE 14.5" LONG Mixture per Ton Mile: 3000 Mixture per Mile: 6860 Face Area: 77.2 Volume: 309 Top Water Temp: 74°C Lab Speed: 88 M.P.H C.O. OPEN ROW 3: GRAHAM PAIGE Car Details: GRAHAM PAIGE, 3.5" x 5", 5 SEATER SEDAN, COMP. RATIO 5.35-1, WHEELBASE 121", DISP 4730 C.C., WT OF CAR 4129 LBS 1.84 TONS Matrix: DEPTH 3.375", 300 SQ INS, 1018 INS³ Top Hatter 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 CANVAS BELT 1.5" WIDE OFF WATER PUMP SHAFT Ratio/Tyre: 3.645-1, TYRE CURCUM. AT 30 LBS/SQ IN 91.0" Ventilation: UNDERSHIELD WELL VENTILATED WITH LOUVRES 5" FINISHES 4" FORWARD OF THE DASH LEAVING A GAP 7" x 14" FOR AIR TO GET AWAY. BONNET 26 LOUVRES 15" LONG SPACED OVER 15.75". ENGINE 10.0" FROM RADIATOR Mixture per Ton Mile: 3260 Mixture per Mile: 6000 Face Area: 65.0 Volume: 220 Top Water Temp: 77°C Lab Speed: 71.66 M.P.H ROW 4: PIERCE ARROW Car Details: 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 Matrix: DEPTH 2.375", AREA 525 SQ IN, VOL 1246 INS³ Top Hatter 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 CANVAS RUBBER BELT WHICH ALSO DRIVES WATER PUMP & DYNAMO Ratio/Tyre: 4.5-1, GOODRICH 7"x18", CIRCUM @ 30 LBS/SQ IN, WATER CAPACITY 3.25 GALLS Ventilation: UNDERSHIELD WELL VENTILATED WITH LOUVRES 5 FINISHES 4" FORWARD OF THE DASH LEAVING A GAP 7" x 14" FOR AIR TO GET AWAY. BONNET 4 SHUTTERS / SIDE 7"x4" APPROX, OA HOLES 1"x5" Mixture per Ton Mile: 4150 Mixture per Mile: 9630 Face Area: 84.4 Volume: 129 Top Water Temp: 82°C Lab Speed: 69.5 M.P.H ROW 5: CHRYSLER 75 Car Details: 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 INS³, E5.375 Top Hatter Tank: TANK EXTENSION BEHIND BONNET, TOTAL TOP TANK VOLUME 573 CU INS. 2.0 GAL, WATER IN RAD 2.2 GAL, TOTAL WATER CAP OF SYSTEM 3.9 GAL Fan and Drive: FAN BLADES 8" LONG, LEADING EDGE .5" FROM RADIATOR, FAN 1.3 TIMES ENGINE SPEED Ratio/Tyre: 3.9-1, EFFECTIVE CIRCUM. 91.0" @ 30 LBS/SQ IN Ventilation: UNDERSHIELD COMPLETE TO WITHIN 3.0" OF THE DASHBOARD NO GEARBOX. UNDERSHIELD CLEAR GAP OF 80 SQ IN EACH SIDE FOR AIR TO GET AWAY UNDER THE DASH. BENEATH FLOORBOARDS. NO GEARBOX LOUVRES. 13 1/2" LONG, 20 PER SIDE. Mixture per Ton Mile: 3410 C.C., LATEST 77 CHRY 3550 Mixture per Mile: 5540 Face Area: 82.7 Volume: 207 Top Water Temp: 73°C Lab Speed: 66.9 M.P.H ROW 6: ROLLS ROYCE 40/50 Car Details: 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", FRONT AREA 300 SQ IN, VOLUME 2320 INS³ Top Hatter Tank: TOP TANK VOLUME N/ 500 CU. INS. 1.8 GAL, WATER IN RAD 4.59 GAL, TOTAL WATER CAP OF SYSTEM 6.95 GAL. CAP OF ENGINE 2.75 GAL Fan and Drive: FAN BLADES 11" LONG, LEADING EDGE 1.5" FROM RAD, FAN DRIVEN AT ENGINE SPEED Ratio/Tyre: 3.727-1, EFFECTIVE CIRCUM. 102.5 Ventilation: TWO (AND SHORTLY 4) BONNET SHUTTERS. STANDARD 2 PER SIDE 10"x4". NO VENTILATION BETWEEN ENGINE & WING. NO VENTILATION BETWEEN ENGINE & FRAME. SIDE GUARDS 8" WIDE BUT NOT IN A VERY EFFECTIVE POSITION. BEING SCREENED BY THE FRONT DAM. OBSTRUCTED ON N.S. BY MAG. ON O.S. BY PETROL FILTER Mixture per Ton Mile: 3670 Mixture per Mile: 8850 Face Area: 71.2 Volume: 285 Top Water Temp: NOT YET ACCURATELY RECORDED Lab Speed: 82.5 M.P.H C.O. OPEN ROW 7: ROLLS ROYCE 25 H.P Car Details: ROLLS ROYCE 25 H.P, 6 SEATER CAB., 3669 C.C. DISP, WT 3850 LBS 1.72 TONS, RATING 20 H.P., COMP. RATIO 5.25-1 Matrix: DEPTH 3.700, FRONT AREA 245 SQ IN, VOLUME 906 CU INS, E.{Mr Elliott - Chief Engineer} 550 G2 Top Hatter 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 Ratio/Tyre: 4.545-1, EFFECTIVE CIRCUM. 96.0" Ventilation: NO BONNET VENTILATION FITTED AS STANDARD. NO VENTILATION BETWEEN RAD & ENGINE. NO WHEELCASE LOUVRES / SIDE IN ENGINE GUARDS. FACILITIES FOR GETTING AIR AWAY UNDER DASH BETTER THAN 40/50 BUT WORSE THAN MOST AMERICAN CARS. Mixture per Ton Mile: 3,175 Mixture per Mile: 5500 Face Area: 83.0 Volume: 308 Top Water Temp: 71°C Lab Speed: 64 M.P.H | ||