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).
Performance graph showing the effect of increasing clearance around the inlet valve tappet.
| Identifier | ExFiles\Box 5a\5\ 05-page172 | |
| Date | 1st October 1931 guessed | |
| EFFECT OF INCREASING CLEARANCE ROUND INLET VALVE TAPPET OPEN EXHAUST 112º CAMSHAFT E.58840 .314 VALVE LIFT 2 CARBURETTORS 28m/m CHOKES RUNNING PIPES COMPRESSION RATIO 5.95 VALVE LIFT .344 .013 CLEARANCE TDC BDC E I 10º 40º 112º MIN. CLEARANCE ROUND INLET VALVE .095" MIN. CLEARANCE ROUND INLET VALVE .080 SEE SKETCH FITS ABOVE BUT .325 VALVE LIFT B.H.P M.E.P. LBS./SQ.' R.P.M | ||