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 Dennis Bros Ltd to High Duty Alloys Ltd providing engine specifications.
| Identifier | ExFiles\Box 116\1\ scan0002 | |
| Date | 8th October 1937 | |
| ALL COMMUNICATIONS TO BE ADDRESSED TO THE FIRM AND NOT INDIVIDUALS BY APPOINTMENT HEAD OFFICE AND WORKS DENNIS BROS LTD COMMERCIAL VEHICLE AND FIRE ENGINE MANUFACTURERS GUILDFORD SURREY, ENGLAND TELEGRAMS: DENNIS GUILDFORD TELEPHONE: GUILDFORD 1575 (7 LINES) OUR REF. JM{Mr Morley}/CS. YOUR REF. HGH/IES. DENNIS ESTABLISHED 1895 A B C CODE 5TH EDITION LIEBERS 5 LETTER BENTLEYS MARCONI BENTLEY'S SECOND. 8th October, 1937. Handwritten text: 1020a Messrs. High Duty Alloys Ltd., 81 Buckingham Avenue, Trading Estate, SLOUGH, Bucks. Stamp: RECEIVED 9 OCT 1937 HIGH DUTY ALLOYS LTD. Dear Sirs, We duly received your letter of September 28th, and have pleasure in giving you the following information:- 1. We are herewith forwarding you a blue print showing the lubricating system for this engine. 2. The crankshaft is made from a chrome molybdenum stamping hardened to a Brinell of approximately 500. 3. The oil pump maintains a pressure of approximately 50 lbs per sq.inch from engine speeds of 500 r.p.m. and upwards. 4. The maximum r.p.m. under load is 1800. Under no-load conditions with the vehicle travelling on favourable gradients the speed may reach 2400 to 2500 r.p.m. before valve bounce sets in. 5. The engine is a 4-cylinder model of 117.47 m/m bore x 150 m/m stroke, the swept volume being approximately 6500 cc. You will note from the print enclosed that the crankshaft is of the 5-bearing type and is of very generous proportions. 6. The type of oil filtration used includes a coarse gauze filter to prevent large particles of carbon, etc. from entering the sump, and two Tecalemit felt or fabric filters incorporated between the oil pump and the front end of the camshaft which acts as a distributor of the oil to all the main and big end bearings. 7. We officially recommend only first class oils as per the following list, which covers Summer (a) and Winter (b):- grades Contd:- Left margin vertical text: CUSTOMERS VEHICLES DRIVEN AT OWNER'S RISK ONLY. Bottom left box: We cordially invite you to the DENNIS STAND NO. 68 AT THE Commercial Motor Transport Exhibition EARLS COURT NOV. 4-13 | ||