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).
Letter from Hepworth & Grandage Ltd. proposing the supply of 48 high-point compression rings for testing.
| Identifier | ExFiles\Box 148\3\ scan0301 | |
| Date | 21th January 1938 | |
| MANUFACTURERS OF "HEPOLITE" REGD. PRODUCTS ON AIR MINISTRY APPROVED LIST . ADMIRALTY . WAR OFFICE . CROWN AGENTS Files 1256. H.109 TELEGRAMS AND CABLES, "RINGS, BRADFORD" CODE BENTLEY'S TELEPHONE: 11100 (8 Lines) HEPWÖRTH & GRANDAGE LTD PISTONS - PISTON RINGS - GUDGEON PINS - LINERS ST.{Capt. P. R. Strong} JOHN'S WORKS BRADFORD LONDON SERVICE DEPOT 78, YORK ROAD, KINGS CROSS, N.1. TELEPHONE: TERMINUS 1418/9 TELEGRAMS: 'VACRIT, NORDO,' LONDON MIDLAND SERVICE DEPOT 120 SNOW HILL, BIRMINGHAM TELEPHONE: CENTRAL 2571/2 TELEGRAMS: HEPLEX, BIRMINGHAM SCOTTISH SERVICE DEPOT 75 MITCHELL STREET, GLASGOW TELEPHONE: CENTRAL 1745/6 TELEGRAMS: HEPOLITE, GLASGOW WESTERN SERVICE DEPOT 27, REDCLIFF STREET, BRISTOL,1. TELEPHONE: 22447/8 TELEGRAMS: HEPO, BRISTOL YOUR REF. OUR REF. WH/ER. DATE 21/1/38. Mr. Matthews, Experimental Engine Dept., Messrs. Rolls Royce, Ltd., DERBY. Dear Mr. Matthews, Referring to our visit yesterday and to the very interesting discussion we had with you, we propose to put in hand about 48 compression rings with the high point of .020"/.025". Unfortunately it will be necessary to make patterns in order that we may form cast the rings. We propose giving them a pressure per square inch of approximately 15 lbs. We would have preferred to put high pressure rings in and for you to definitely increase the supply of oil to the cylinder walls, but we understand there is some difficulty in obtaining this increased oil supply, and therefore the high pressure rings cannot be tested in your engine as it exists. We would say, however, that it is not possible to fit high pressure rings without considerably increasing the supply of oil to the cylinder walls, in fact, they should be definitely flooded with oil. We should be obliged if you would kindly reply stating that this course meets with your approval, and if so, will you kindly send your covering order. We would put the rings in at the same price as those last supplied, although the invoice price of the ring will not by any means cover the manufacturing cost, but we propose to do this to carry out this test, which we trust will be to our mutual advantage. We are, Yours faithfully, HEPWÖRTH & GRANDAGE LTD., Joint Managing Director. | ||