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).
Issues with valve springs, petrol pumps, and comparing radiator weights.
| Identifier | ExFiles\Box 5a\4\ 04-page082 | |
| Date | 30th July 1934 | |
| 1980 C Steadman ✓ Smith ✓ Hall [Signature] hotel de france. chateauroux. indre. france. 30th July 1934. To HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} from G.W.H. We have received 18 valve springs EB.175 which we understand you have sent for 21 @ 17. We have received your memo of the 28th With regard to your memo of the 24th, wherein you state that the thin Harrison radiator saves 35 lbs. weight, we are at a loss to know how this has been obtained. The weights of the two radiators are as follows: Present Bontley Radiator - 4 B IV. Weight empty:- 78 1/2 lbs. Filled with water to within 2 1/2" from filler cap :- 100 lbs. Capacity:- 16 pints. Harrison Radiator sent out. Weight empty:- 71 1/2 lbs. Filled with water, as above, 85 lbs. Capacity:- 10 1/2 pint Petrol pumps. One of the pumps failed through the main wire breaking off from under the stud head. The method of fastening this wire is asking for break-ages. a hole is drilled through the stud close to the head, the wire pushed through and tightened up In dismantling the pump we found that the fabric had disintegrated, the fabric having cut through in a circle at a radius of half the brass washers; both pumps are alike. There is only the outer skin in operation. The S.U.' must have altered the design, as there was a protecting washer each side of the fabric. as it is now, the washer comes in direct contact with the fabric. We enclose one of the diaphragms. Valve Spring Breakages. We have measured as near as we can the difference in the lift of the valves, and find that the cams for Nos. 1 & 8 open the valve .0312" more than the rest of the cams we measured:i.e. .4062 as against .375; cutting down the valve clearance, has of course, made it worse, the valve springs being over-stressed. To overcome the trouble the springs should be shortened in length by .125 and Washers made to make up th deficiency. This would stop the surging. G.W.H. [Signature] | ||