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).
Alterations to the Goshawk engine, specifically cancelling rollers on valves due to flats forming and replacing them with case-hardened rockers.
| Identifier | WestWitteringFiles\I\June1922\ Scan87 | |
| Date | 21th June 1922 | |
| R.R. 235A (100 T) (S.H. 788. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} C. to CJ. C. to Wor.{Arthur Wormald - General Works Manager} C. to By.{R.W. Bailey - Chief Engineer} C. to Ep.{G. Eric Platford - Chief Quality Engineer} RE. GOSHAWK ENGINE. X4229 X4226 It is understood that we are cancelling rollers on the top of the valves because of the flats forming. We have concluded that the flats formed through the inertia of the roller preventing it rotating in space which naturally cannot be cured by any alteration in the friction which would not give other troubles. We have decided therefore to abandon the roller and have the new rockers made with curved ends which will be carefully case-hardened. The ends of the valves will also need hardening. As there will be alterations to the valve washers and the rockers we shall be pleased if you will hold the production of these over for further instructions. The rocker shaft will also be lowered to bring the contact point right; this will affect the tappet rods and the supports. R.{Sir Henry Royce} | ||