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).
Technical report on Mercedes Benz dry cylinder liners.
| Identifier | ExFiles\Box 134\1\ scan0183 | |
| Date | 3rd October 1940 guessed | |
| Rm{William Robotham - Chief Engineer}/HH. What is the thickness of our B80 dry-liners FILE Gm .125 Holo MERCEDES BENZ DRY CYLINDER LINERS. The 6 dry liners are screwed into the cylinder block which is integral with the cylinder head. They appear to have been able to make the joint at the end of the cylinder liner and also to pull down on the base of the block at the same time. Also since the skirts have slots in them for receiving the connecting rods, the liner must be in the correct position rotationally. The steel liner is soft, the Brinell being 255. The thickness of the aluminium cylinder wall is .3 and the liner thickness .095. I could not detect any signs of burning of the liner, but this may be explained since we know that the coolant temperature is kept below 80ºC. The securing of each cylinder block to the crankcase is made by six large nuts situated inside the crankcase which screw on to the liner skirt. The job has been designed so economically that these nuts must be put in position first and then the block is offered up and the large nuts which are some 6½" in diameter are tightened by means of special tools. It will be noticed that the designer having striven to save all room possible, he finds himself with the cylinder spacing of 7" as against 6.65 on the Junker for the same bore of engine. The cylinder block with this design contributes very little stiffness to the crankcase, and one can detect considerable efforts have been made to make the crankcase stiff in itself. The depth of 7½" upwards from the crankshaft centre line to the face of the crankcase is abnormal. Coupled with this there are the usual cross bolts to tie the two sides of the crankcase together and a large aluminium plate which stradles the whole of the crankcase face which is secured firmly and at many points. Jnr.{Charles L. Jenner} [Signature] | ||