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).
Specification sheet for an overhead valve engine detailing valve gear weights, spring loads, timing, and accelerations.
| Identifier | ExFiles\Box 158\4\ scan0276 | |
| Date | 13th December 1938 guessed | |
| 1360. OVERHEAD VALVE ENGINE. VALVE GEAR WEIGHTS. (A) Valve ....................... .1986 lbs. (B) Spring ...................... .1304 (C) Retaining Washer and Wedges .0656 (D) Rocker ...................... .2500 (E) Adjusting Screw ............. .0233 (F) Lock Nut for Adj. Screw .... .0089 (G) Push Rod with ends ........ .1227 x (H) Tappet ...................... .2321 x Hollow Cast Iron Tappet - no allowance for hydraulic plunger, etc. SPRING LOADS. lbs. Valve Seated 52 Full Lift (.400) 128 VALVE TIMING AT .020 CLEARANCE. Inlet Opens T.D.C. " Closes 32° After B.D.C. Exhaust Opens 32° Before B.D.C. " Closes T.D.C. ACCELERATIONS AND VELOCITIES. Max. Positive Acceleration .0013746 Ins/Deg² " Velocity .01228 " " Negative Acceleration .00035696 " NOTE THAT THESE ARE VALVE ACCELERATIONS AND VELOCITIES. MAXIMUM SPEED 4250 R.P.M. | ||