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).
Comparison table of various car radiators and their specifications.
| Identifier | ExFiles\Box 24\4\ Scan113 | |
| Date | 3rd October 1923 | |
| COMPARISON CAR RADIATORS. COLUMN HEADERS: TYPE OF CAR, ENGINE DETAILS, TYPE OF RADIATOR MATRIX, DIMENSIONS OF MATRIX, CAPACITY OF WATER SYSTEM, TYPE OF CIRCULATION, TYPE OF FAN. FAN SPEED RELATIVE TO CRANK. SIZE OF FAN, BONNET VENTILATION SHUTTERS, LOUVRES ETC, UNDERSHEETING ETC, DISTANCE OF CYL. BLOCK FROM RADIATOR. OTHER OBSTRUCTIONS, DIRECT DRIVE RATIO, TYRE DIAM, TEMPERATURE CONTROL. DATA ROWS: 1. 40/50 ROLLS ROYCE: - Engine Details: SIDE VALVE. 6CYL. 7433 C.C's. 114.2 x 120.3 - Type of Radiator Matrix: AIR TUBE (with diagram). - Dimensions of Matrix: HEIGHT. 20¼". BREADTH. 24". DEPTH. 4.8. AREA=486 □". VOLUME = 2333 O.{Mr Oldham} LATEST STANDARD HEIGHT 21¼", AREA 510, DEPTH 4.8, VOLUME 2450. - Capacity: 7.47 GALS. - Circulation: CENTRIFUGAL PUMP. - Fan: 6 BLADED SHEET ALUMINIUM BLADES 22" SPAN. 1¼ SHAFT SPEED. (Handwritten: E.A.S. - 1 1/4 ENG). - Bonnet Ventilation: 4 SHUTTERS TOTAL AREA 168 □". - Undersheeting: COMPLETE UNDERSHIELD. VENTILATED AT THE SIDES. - Distance: 9" FROM MATRIX. AREA ABOUT 90□" OF CYL. BLOCK & PORTION OF TIMING CASE. - Direct Drive Ratio: 3.71 - Tyre Diam: 33" - Temperature Control: THERMOSTAT. 2. HISPANO SUISA 38 H.P.: - Engine Details: 6 CYL. 6590 C.C.'s. 6 CYL. - Type of Radiator Matrix: ORNAMENTAL RIBBON (with diagram). - Dimensions of Matrix: HEIGHT 28½". BREADTH 20½". DEPTH 4". FACE AREA= 584.2. VOLUME = 2337. - Capacity: 7.57 GALS. - Circulation: CENTRIFUGAL PUMP. - Fan: 4 BLADED ALUM. FINS ON STEEL SPINDLE 14" ACROSS. 1 7/8 ENGINE (Handwritten: CRANKSHAFT SPEED). - Bonnet Ventilation: 42 LOUVRES 15½" HIGH. - Undersheeting: NOT OBSERVED. - Distance: 12" FROM MATRIX. TIMING CASE & DISTRIBUTORS PARTIALLY BLOCK AIR FLOW. - Direct Drive Ratio: 3.5 - Tyre Diam: 35.25 - Temperature Control: NONE VISIBLE. 3. DE LAGE 24 H.P.: - Engine Details: SIDE VALVES. 6 CYL. 80 x 150. 4570 C.C.'s. - Type of Radiator Matrix: AIR TUBE (with diagram). - Dimensions of Matrix: HEIGHT. 22½". BREADTH 20". DEPTH. 3¼". FACE AREA=450. VOLUME = 1462.5. - Capacity: 5 GALS. - Circulation: CENTRIFUGAL PUMP. - Fan: 4 BLADED ALUMINIUM. CRANKSHAFT SPEED. - Bonnet Ventilation: 32 LOUVRES 11½" HIGH. - Undersheeting: NONE. - Distance: 8½" FROM MATRIX OBSTRUCTS ABOUT 88□". - Direct Drive Ratio: 3.5 - Tyre Diam: 35.25 - Temperature Control: NONE VISIBLE. 4. FIAT 10 H.P.: - Engine Details: SIDE VALVES. 65 x 110. 1465 C.C.'s. - Type of Radiator Matrix: RIBBON ZIG ZAG DIAGONAL (with diagram). - Dimensions of Matrix: HEIGHT 21". DEPTH 3". FACE AREA=302.7. VOLUME = 908.1. (with radiator shape diagram showing dimensions: 17", 12", 21", 18", 12 1/2"). - Capacity: 2.125 GALS. - Circulation: CENTRIFUGAL PUMP. - Fan: 4 BLADED. APPARENTLY ABOUT 1¾ ENGINE SPEED. 17" I. - Bonnet Ventilation: 44 LOUVRES 8¼" HIGH. - Undersheeting: NOT OBSERVED. - Distance: 7" FROM MATRIX. WITH THE TIMING CASE. ALMOST 10 FT. OBSCURED. - Direct Drive Ratio: 5.1 - Tyre Diam: 28" - Temperature Control: NONE VISIBLE. 5. NAPIER 39 H.P.: - Engine Details: OVERHEAD CAMSHAFT. 102 x 127. 6 CYL. 6230 C.C.'s. - Type of Radiator Matrix: AIR TUBE (with diagram). - Dimensions of Matrix: HEIGHT 22". 23¼" BROAD. 4" DEEP. FACE AREA = 501□". VOLUME = 2004. - Capacity: 5.75 GALS. - Circulation: CENTRIFUGAL PUMP. - Fan: SMALL ALUMINIUM FAN. 15½" DIA. - Bonnet Ventilation: NONE. - Undersheeting: NOT OBSERVED. - Distance: 9½" FROM MATRIX. TIMING CASE OBSCURES RAD. SLIGHTLY. - Direct Drive Ratio: 3.7 - Tyre Diam: 36 - Temperature Control: THERMOSTAT. 6. BENTLEY 3 LITRE: - Engine Details: OVERHEAD VALVE. 80 x 149. 4 CYL. 2996 C.C.'s. - Type of Radiator Matrix: RIBBON ZIG ZAG DIAGONAL (with diagram). - Dimensions of Matrix: HEIGHT 22½". BREADTH 19". DEPTH 3". FACE AREA=332.5. VOLUME = 997.5. (with radiator shape diagram showing dimensions: 22½", 5", 6", 1FT). - Capacity: 4 GALS. - Circulation: CENTRIFUGAL PUMP. - Fan: No FAN. - Bonnet Ventilation: 22 LOUVRES 7" HIGH. - Undersheeting: COMPLETELY UNDERSHEETED. - Distance: ABOUT 8½" FROM MATRIX. V SHAPE RADIATOR GIVES MORE ROOM. - Direct Drive Ratio: 3.82 - Tyre Diam: 32" - Temperature Control: THERMOSTAT. 7. MINERVA. 30 H.P.: - Engine Details: 6 CYL. SLEEVE VALVES. 90 x 140. 5340 C.C.'s. - Type of Radiator Matrix: STRIP FIN & TUBE (with diagram). AUX TANK (with diagram). - Dimensions of Matrix: HEIGHT 19½". BREADTH 18½". DEPTH 4 7/8". FACE AREA = 360.5. VOLUME = 1760. - Capacity: 6 5/8 GALS. - Circulation: CENTRIFUGAL PUMP. - Fan: TWO BLADED CAST ALUM 18½" SPAN. ABOUT TWICE ENGINE. - Bonnet Ventilation: 34 LOUVRES 10½" HIGH. - Undersheeting: NONE. CRANKCASE FINNED. - Distance: 14" FROM MATRIX. CRANKCASE FINNED. - Direct Drive Ratio: 3.6 - Tyre Diam: 35.25 - Temperature Control: NONE VISIBLE. 8. VOISIN: - Engine Details: SIDE VALVES. 4 CYL. 95 x 140. 3960 C.C.'s. - Type of Radiator Matrix: ZIG ZAG RIBBON (with diagram). - Dimensions of Matrix: HEIGHT 23½". DEPTH 3". FACE AREA = 330. VOLUME = 990. (with radiator shape diagram showing dimensions: 5", 9½", 12", 3½"). - Capacity: 3.56 GALS. - Circulation: CENTRIFUGAL PUMP. - Fan: 17" SPAN 3 BLADED. ABOUT TWICE CRANKSHAFT SPEED. - Bonnet Ventilation: 6 LOUVRES 10" HIGH. - Undersheeting: NONE. CRANKCASE FINNED. - Distance: 13" FROM MATRIX. CRANKCASE FINNED. - Direct Drive Ratio: 3.9 - Tyre Diam: 35.25 - Temperature Control: NONE VISIBLE. 9. FARMAN: - Engine Details: O.H.V. 6 CYL. 100 x 140. 6590 C.C.'s. - Type of Radiator Matrix: ZIG ZAG RIBBON (with diagram). - Dimensions of Matrix: HEIGHT 26½". DEPTH 4". FACE AREA = 551. VOLUME = 2204. (with radiator shape diagram showing dimensions: 26½", 13", 16"). - Capacity: NOT OBTAINABLE. - Circulation: CENTRIFUGAL PUMP. - Fan: 18" SPAN 3 BLADED. ENCLOSED DRIVE. - Bonnet Ventilation: 4 SHUTTERS AREA EACH ONE 45□" = 180□". - Undersheeting: NOT OBSERVED. - Distance: 10" FROM MATRIX. - Direct Drive Ratio: 3.4 - Tyre Diam: 35.25 - Temperature Control: NONE VISIBLE. 10. ISOTTA FRASCHINI: - Engine Details: 8 CYL IN LINE. 85 x 130. 5881 C.C.'s. - Type of Radiator Matrix: ZIG ZAG RIBBON (with diagram). - Dimensions of Matrix: HEIGHT 25". BREADTH 21 7/8". DEPTH 4 3/4. FACE AREA = 541.5. VOLUME = 2572. (with radiator shape diagram showing dimensions: 21 7/8", 16", 1½"). - Capacity: NOT OBTAINABLE. - Circulation: CENTRIFUGAL PUMP. - Fan: 22" SPAN. 4 BLADED CAST ALUM. DRIVEN OFF DYN.SHAFT & GEARED DOWN. - Bonnet Ventilation: 50 LOUVRES 25" LONG. LOUVRES TO ENGINE VALANCES. - Undersheeting: NONE. - Distance: 7 3/4" FROM MATRIX. ENGINE OBSCURES 88□". ALSO TIMING CASE A LITTLE. - Direct Drive Ratio: 4.1 - Tyre Diam: 35.25 - Temperature Control: NONE VISIBLE. 11. PACKARD 43.2 H.P.: - Engine Details: SIDE VALVES. TWIN SIX. 3" x 5". 6930 C.C.'s. - Type of Radiator Matrix: ZIG ZAG RIBBON (with diagram). - Dimensions of Matrix: HEIGHT 22". BREADTH 20½". DEPTH 3 7/8. FACE AREA = 448. VOLUME = 1736. (with radiator shape diagram showing dimensions: 20½", 12", 24½", 2"). - Capacity: NOT OBTAINABLE. - Circulation: CENTRIFUGAL PUMP. - Fan: 6 BLADED CAST ALUM. - Bonnet Ventilation: 66 LOUVRES 12½" LONG. - Undersheeting: NOT OBSERVED. - Distance: 8 3/4" FROM RADIATOR. - Direct Drive Ratio: 4.36 - Tyre Diam: 35" - Temperature Control: THERMOSTAT. 12. PANHARD: - Engine Details: SIDE BY SIDE. 105 x 140. 4 CYL. 4850 C.C.'s. - Type of Radiator Matrix: CONTINUOUS FIN & TUBE (with diagram). - Dimensions of Matrix: HEIGHT 24½". BREADTH 11". DEPTH 4". FACE AREA = 539. VOLUME = 2156. (with radiator shape diagram showing dimensions: 11", 24½", 12", 4"). Handwritten near diagram: 25.5", 8.5", +10.375". - Capacity: NOT OBTAINABLE. - Circulation: CENTRIFUGAL PUMP. - Fan: 3 BLADED ALUMINIUM. 18" ACROSS. ABOUT 1 3/4 CRANK SPEED. - Bonnet Ventilation: NONE. - Undersheeting: NOT OBSERVED. - Distance: 11½" FROM MATRIX. BLOCKS ABOUT 85□". - Direct Drive Ratio: 3.3 - Tyre Diam: 30" - Temperature Control: NONE VISIBLE. 13. 20 H.P. ROLLS ROYCE: - Engine Details: 6 H.V. 6 CYL. 3 x 4½. 3126 C.C.'s. - Type of Radiator Matrix: AIR TUBE (with diagram). - Dimensions of Matrix: HEIGHT 19". BREADTH 21.6". DEPTH 3.95". FACE AREA = 410.4□" VOLUME 1620. - Capacity: 4.28 GALS. (Handwritten: CONTINENTAL 3.20 GAL = 10% TO BE ADDED). - Circulation: CENTRIFUGAL PUMP. - Fan: 4 BLADED. SHEET METAL FINS. 1 1/4 SHAFT SPEED. - Bonnet Ventilation: NONE. - Undersheeting: COMPLETE UNDERSHIELD. - Distance: 8" TIMING CASE & ENGINE OBSCURE ABOUT 1 SQ. FT. - Direct Drive Ratio: 4.5 - Tyre Diam: 31.4 - Temperature Control: SHUTTERS. 14. ALPHA ROMEO (Handwritten row): - Engine Details: 4. O.H.V. 6 Cyl. 2.99x4.33 - Type of Radiator Matrix: HEXAGONAL TUBE - Dimensions of Matrix: Face area 393 □" Volume 1230 Cu.ins. Depth 3 1/8" - Capacity: 3.85 GALS - Fan: 2 BLADED FAN SPEED 2-1 APPROX. - Direct Drive Ratio: 3.83 - Tyre Diam: 31.4 BOTTOM RIGHT CORNER: W.A.B. 3.10.23 | ||