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).
List of design features for Cadillac tappets intended for use in a Bentley.
| Identifier | ExFiles\Box 85\3\ scan0035 | |
| Date | 1st December 1934 | |
| L.207 Hs{Lord Ernest Hives - Chair}/Std.1/KW.1.12.34 Cadillac Tappets for Bentley. Features to be used in design :- (1) Cyl. head EB.615 modified for two rocker shafts and plunger casing seatings - see Hs.{Lord Ernest Hives - Chair}1629. (2) Lengthened (approx. .200") and lightened valves and push rods. (3) Valve springs to Hs.{Lord Ernest Hives - Chair}1607. (4) Plunger casings with latest metering plug oil feed (see Hs.{Lord Ernest Hives - Chair}1629) and dust covers - the latter to have no lip on them to avoid raising overall height of rocker shaft. (5) Plungers of similar external dimensions to J-III, but being of latest Phantom design (E.85559/60) using poppet valves. Clearance in plunger casing to be .001". (6) Plunger springs similar to latest Phantom, using J-III strengths. (7) Pedestals similar to J-III but reduced in width (see Hs.{Lord Ernest Hives - Chair}1629). (8) Rocker shafts of J-III dimensions in SZN hardened and copper deposited as Phantom. (9) Eccentrics of similar dimensions to J-III, in cast iron, design as latest Phantom except that eccentric arms are to be approx. .200" thick. (10) Floating bushes, similar dimensions to J-III, oiling scheme as latest Phantom - Hs.{Lord Ernest Hives - Chair}1471. (11) Rockers - as J-III except for alterations necessary to suit Bentley valve and push rod arrangement - oil feed to valve tips as Phantom. Oil Supply :- We shall require a second stage oil pressure supply and a separate filter for rocker oil. These requirements are catered for by a scheme designed by E's Dept. for Halford tappets, but not yet issued - LeC.4062. Hs{Lord Ernest Hives - Chair}/Std. | ||