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).
Chart showing cylinder block pressures for standard and modified pipes.
| Identifier | ExFiles\Box 179\3\ img035 | |
| Date | 18th March 1932 | |
| CHART SHOWING CYL BLOCK PRESSURES STANDARD & MODIFIED PIPES [Table 1] Headers: RPM | WATER TEMP | CYL BLOCK P A | CYL BLOCK P B | WATER RAIL PRESS FRONT | WATER RAIL PRESS REAR | HORN P PRESS | HDR TANK PRESS ① SYSTEM STANDARD Data: 2140 | 110 | 10.5 | 10.5 | 8.5 | 6 | 15 | 2 ② 3/4" EXTRA PIPES FROM CORE PLUG AT FRONT OF BLOCKS TO HEADERTANK DIRECT Data: 2140 | 108 | 8.5 | 8.5 | 7 | 4.5 | 12 | 1.75 ③ REAR OUTLETS LEAD DIRECT TO HEADER TANK. FRONT EXTRA PIPES BLANKED OFF. Data: 2130 | | 9 | 9 | 7.5 | 4 | 15 | 2 ④ 3/4" EXTRA PIPES FROM FRONT & REAR PIPES DIRECT TO HEADER TANK. Data: 2100 | 108 | 7.5 | 8 | 6.5 | 3 | 13 To 14 | 1.75 [Table 2] COMPARISON OF STANDARD CARB IN VEE. CARB IN VEE MODIFIED & SUPERCHARGED Headers: TYPE | RPM | TEMP | PRES CYL BLOCK | PRES W'TER RAIL | PRES HORN PIPE | PRES HDR TANK Data: STD CARB IN VEE | 2140 | 110 | 10.5 | 8.5 | 15 | 2 Data: MOD. CARB IN VEE | 2100 | | 7.5 To 8 | 6.5 | 12 | 1 1/2 To 2 Data: SUPERCHARGED | 2100 | 108 | 7.5 To 8 | 4 To 5 | 11 To 12 | 1 1/2 To 2 [Stamp] ROLLS-ROYCE, LTD. PRINT ROOM MAR 18 1932 DERBY. | ||