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).
Cylinder block extension, valve timing with different tappet clearances, and water pump flow rate tests.
| Identifier | ExFiles\Box 180\M1\1\ img004 | |
| Date | 4th August 1921 | |
| Contd. -3- Hs{Lord Ernest Hives - Chair}1/LG4.8.21. -------------- The extension of the cylinder block and valve mechanism appear to be about .003" more than the tappet rod but in the case of the exhaust valve, this is nearly balanced by the lengthening of the valve stem. We can notice the very slow approach on the cams - this is shown very clearly on the valve timing with different clearance in the tappets. Clearance I.O. I.C. Range E.O. E.C. Range .004" 15° 70° 265° 106° 17° 271° B.T.D.C. P.B.D.C. P.T.D.C. P.T.D.C. .008" 2° 54° 236° 116° 6° 250° B.T.D.C. P.B.D.S. P.T.D.C. P.T.D.C. Water Pump. We have tested the flow per min. of water through the engine:- Engine revs. Galls. per min. 300 1.58 500 3.75 1000 7.5 1500 10.9 2000 15.0 Mr. Royce will remember that we did not like the look of the rotor, but the performance of the pump appears to be quite satisfactory. Contd. [Upside down text at bottom] R.R. 355A (10M T) S.H.T.S. 10-11-20 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 5241 | ||