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).
Responding to three technical points regarding the clutch, valve erosion, and exhaust port washers.
| Identifier | ExFiles\Box 5a\2\ 02-page356 | |
| Date | 22th December 1930 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. BY/TWB. c. BY/GS. V8840 BY9/G.22.12.30. 18-G-4. The three points raised in GWH{George W. Hancock - Head Chateauroux}'s memo, dated 17.12.30. from Chateauroux will have attention. 1/- CLUTCH. I am asking Mr. D'Aeth to look in-to the clutch to make the necessary arrangements for an oil catcher on the clutch plate, and arrange for some further holes to allow the oil to work out at the rear end of the clutch spigot. 2/- VALVES. We do not consider this has anything to do with the hardness of the material, as obviously the valve does not hammer on its seat. We think it is some form of erosion exactly like we used to get on aero engines. It will be of interest to check this particular head when we get it back, but personally I do not think the brinell figure has much to do with it. I should think that the use of aluminium bronze seatings for the exhaust valves would be the most reasonable proposal to overcome it. 3/- EXHAUST PORTS - COPPER ASBESTOS WASHERS. As a matter of interest I had already in connection with the aero engines suggested new washers .125 larger in the bore. I am ordering up washers which similarly will be somewhat larger in the bore for both 20 HP. and 40/50 HP., as obviously the washer itself ought not to be in the direct path of the hot gases. I consider that the copper asbestos washer on 20 HP. should be .0625 larger in bore than the port, and the 40/50 HP. should be .092. These modifications should put through immediately. [STAMP: RECEIVED 24 DEC 1930] BY.{R.W. Bailey - Chief Engineer} BM | ||