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).
Blueprint of a modified exhaust cam-form for the Bentley III, with lift data tables.
| Identifier | ExFiles\Box 100\3\ scan0028 | |
| Date | 24th May 1938 | |
| E-CD681 DURATION OF MAX'y LIFT 2 1/2º SEE VALVE LIFT CURVE .311 LIFT VALVE OPENING VALVE CLOSING BASE CIRCLE 1.000" DIAM. ROTATION APART FROM THE CAM FORM THE CAMSHAFT IS NOT ALTERED. THIS CAM LEADS THE INLET CAM BY 1 1/2º Left Table: CAMSHAFT DEGREES, CAM LIFT OPENING INCHES 0, 0 1, .000065 2, .000260 3, .000586 4, .001041 5, .001626 6, .002342 7, .003188 8, .004099 9, .005010 10, .005920 11, .006931 12, .007742 13, .008653 14, .009564 15, .010475 16, .011386 17, .012296 18, .013612 19, .015739 20, .018675 21, .022423 22, .026980 23, .032348 24, .038526 25, .045515 26, .053313 27, .061891 28, .070678 29, .079465 30, .088253 32, .105560 34, .122418 36, .138721 38, .154456 40, .169597 42, .184103 44, .197947 46, .211102 48, .223510 50, .235234 52, .246158 54, .256358 56, .265632 58, .274129 60, .281783 62, .288571 64, .294482 66, .299508 68, .303635 70, .306855 72, .309153 74, .310539 76, .311 Right Table: CAMSHAFT DEGREES, CAM LIFT CLOSING INCHES 78 1/2, .311 80 1/2, .310565 82 1/2, .309262 84 1/2, .307093 86 1/2, .304064 88 1/2, .300183 90 1/2, .295460 92 1/2, .289705 94 1/2, .283534 96 1/2, .276363 98 1/2, .268408 100 1/2, .259690 102 1/2, .250231 104 1/2, .240053 106 1/2, .229181 108 1/2, .217643 110 1/2, .205465 112 1/2, .192677 114 1/2, .179308 116 1/2, .165392 118 1/2, .150959 120 1/2, .136044 122 1/2, .120680 124 1/2, .104902 126 1/2, .088746 128 1/2, .072248 129 1/2, .063878 130 1/2, .055884 131 1/2, .048513 132 1/2, .041914 133 1/2, .036038 134 1/2, .030884 135 1/2, .026452 136 1/2, .022743 137 1/2, .019756 138 1/2, .017491 139 1/2, .015949 140 1/2, .015130 141 1/2, .014671 143 1/2, .013754 145 1/2, .012837 147 1/2, .011920 149 1/2, .011003 151 1/2, .010087 153 1/2, .009170 155 1/2, .008253 157 1/2, .007336 159 1/2, .006419 161 1/2, .005502 163 1/2, .004585 165 1/2, .003668 167 1/2, .002751 169 1/2, .001834 171 1/2, .001032 173 1/2, .000459 175 1/2, .000115 177 1/2, 0 ROLLS-ROYCE, LTD. PRINT ROOM MAY 24 1938 DERBY. G H Harker 19.May.38 SCALE ¼ THIS CAM FORM (WHICH MODIFIES E-CD167) IS DEVELOPED FROM VALVE LIFT CURVE E-CD673 USING WRAITH III TAPPETS & ROCKERS MODIFIED EXHAUST CAM-FORM - BENTLEY III. E-CD681 | ||