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).
The weight comparison of new and old pipes and engine tappet clearances.
| Identifier | ExFiles\Box 43\1\ Scan075 | |
| Date | 8th February 1925 | |
| R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF Hs{Lord Ernest Hives - Chair}/TAG/LG8.2.25. experienced on the 1B-Condor which had pipes of a simile style as this. WEIGHT OF NEW PIPES ETC :- NEW. OLD. 'U' pipe -------- 4 lbs. 3 ozs. 2 lbs. 9 ozs. Jacketed bend - complete with gland, ring and nut -------- 3 lbs. 8 ozs. 2 lbs. 12 ozs. Nett increase = 4 lbs. 12 ozs. Tappet clearances at the starter were :- Inlet .020". Exhaust .030" cold. At the end of the test the clearances were again checked when the engine was cold. A.{Mr Adams} side. B. side. Cyl. Inlet. Exhaust. Inlet. Exhaust. 1 .018 .016 .010 .032 2 .014 .032 .010 .032 3 .018 .034 .012 .025 4 .014 .026 .012 .027 5 .014 .025 .012 .024 6 .009 .032 .026 .025 No trouble was experienced with the valves or valve spring caps or wedges. The new type priming pipe, the two-way branch of which is fastened on the top of the crankcase behind the breather, was quite O.K. Dismantling report to follow. Hs{Lord Ernest Hives - Chair}/TAG. | ||