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 The Associated Equipment Co Ltd answering questions about cylinder materials and wear.
| Identifier | ExFiles\Box 132\4\ scan0033 | |
| Date | 1st December 1936 | |
| THE ASSOCIATED EQUIPMENT Co LTD TELEPHONE: SOUTHALL 2424 (17 LINES) SOUTHALL MIDDX TELEGRAMS: "VANGASTOW SOUTHALL" YOUR REF. Rm.{William Robotham - Chief Engineer}/Smth.14/AP. OUR REF. C.E./HGY/GD. 1st December, 1936. Messrs. Rolls-Royce Ltd., Experimental Department, Derby. Dear Sirs, With reference to your letter of the 25th ultimo, regarding cylinder materials and wear, we give the following answers to your questions:- 1. Do you fit separate liners ? Yes. 2. What material do you use and what is its hardness ? Drawing No. A.57109 is attached and will give you hardness. Specification No.21 for the material is also attached. 3. What is the usual rate of wear in a bus engine ? For the engine under review, the cylinder wear figure works out at 0.00031" per 1,000 miles. 4. What material do you use for the piston rings, and what is its hardness ? Drawing No. A2/11619 is attached and will give you the brinell hardness figures of piston rings. We also attached material specification No.22. 5. Do you fit aluminium pistons ? Yes. Yours faithfully, For THE ASSOCIATED EQUIPMENT CO., LTD., G.{Mr Griffiths - Chief Accountant / Mr Gnapp} J.{Mr Johnson W.M.} RACKHAM CHIEF ENGINEER. 8926 - 9 - 35. CUSTOMERS' VEHICLES ARE BROUGHT ON TO OUR PREMISES, DRIVEN BY OUR STAFF, AND STORED FOR REPAIRS AT CUSTOMERS' OWN RISK AGAINST DAMAGE HOWSOEVER CAUSED. | ||