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).
Suggested modification to a 3½ litre Bentley valve gear mechanism.
| Identifier | ExFiles\Box 88\4\ scan0097 | |
| Date | 1st August 1934 | |
| [ "SUGGESTED MODIFICATION TO 3½ LITRE BENTLEY VALVE GEAR", "Shrink fit in Rocker", "(Pin at 90° to position shown)", "Rocker End lightened by 20 grams", "Light alloy Ball Stop", "Estimated equivalent weight to be accelerated by Valve Spring = 193 gms", "Max. Crankshaft speed without Valve bounce = 5270 R.P.M", "Lightened Valves", "Part No. H.S. 1450-1451", "Alternative Push Rod Spring Fixing", "Back-cuttered & opened up to take Spring Seating", "R.R. Tappet Spring", "R.R. Valve Collets", "Spring Pressures adjusted to return Push Rod & Tappet at 5270 R.P.M.", "Standard R.R. adjustment", "Modified adjustment", "SK.4394", "Drawn - F", "Checked - GAC", "Passed - F.W.R.", "Traced - F.M.", "1.8.34", "Stamp: EXPERIMENTAL & RESEARCH DRAWING OFFICE, -1 AUG 1934" ], | ||