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).
Specifications and test results for an Alfa-Romeo Camshaft Vibration Damper.
| Identifier | ExFiles\Box 124\5\ scan0046 | |
| Date | 23th February 1932 | |
| To Hs{Lord Ernest Hives - Chair} / Gry.{Shadwell Grylls} X4482. ALFA-ROMEO CAMSHAFT VIBRATION DAMPER. WT OF SEGMENTS. TOTAL WT OF SEGMENTS (WITH GUIDE PINS) 7 OFF = 104.5 GRMS. ∴ WT PER SEGMENT = 14.93 GRMS = .527 OZS. TORQUE REQD TO OVERCOME SPRING PRESSURE ON DRUM. MIN: TORQUE = 1.25 LB. FT. } EITHER DRY OR LUBRICATED. MAX: " = 1.75 LB. FT. IT WAS AFTERWARDS FOUND THAT THE DRUM WAS .005" OVAL. SPRINGS. WT PER SPRING = 1.79 GRMS = .0634 OZS. h₁ - SPRING HT: WHEN SEGMENTS PRESS ON DRUM. = .235" h₂ - " AT MAX POSSIBLE POSITION = .185" TABLE 1: SPRING INDEX LETTER | DEFL: AT 50LB LOAD INS | FREE HEIGHT "h" INS A | .108 | .258 B | .105 | .260 C | .111 | .268 D | .111 | .265 E | .135 | .260 F | .134 | .258 G | .100 | .250 TABLE 2: RATING. LOAD LB. | DEFLECTION FROM FREE POSITION - INS | A | B | C 0 | o | o | o 10 | .026 | .024 | .025 20 | .047 | .042 | .043 30 | .065 | .064 | .068 40 | .088 | .079 | .084 50 | .108 | .105 | .111 60 | .143 | .160 | --- [Diagram of a spring showing its free height] FREE HEIGHT "h" P.T.O | ||