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).
Potential engine modifications to reduce oil temperature and improve filtration to combat cylinder bore wear.
| Identifier | ExFiles\Box 93\4\ scan0053 | |
| Date | 16th July 1936 | |
| To Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell} x319 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/KW.16.7.36. Cylinder Bore Wear. I think that even when we get the thin oil running in our engines we shall suffer from excessive cylinder bore wear unless we keep the oil temperature down. At the moment with thin oil and increased circulation we are likely to have higher oil temperatures than in the past. I am sure we can drop the oil temperature anything up to 20°F.{Mr Friese} by a redesign of the bottom half. We should like you to look into this on the lines of the M.G. going out sideways. You will remember that we did a lot of work on the Peregrine bottom half, which proved that we had to have ribs on the inside as well as the outside if we were to get cooling. In our new bottom half we must ensure that oil returning from the crankshaft and pistons passes via the ribbed sides to the filter. At the same time as we are increasing the cooling capacity of the bottom half, I think we ought to make sure that the inlet to the filter is in a better position, so that all the sludge is not circulated through the engine as at present. It is stupid to arrange to pick up all the dirt in the bottom half and then put a large filter in to extract this foreign matter. Can we anyhow simply utilise the Ph.III oil cooler ? We do not want to carry a great deal more oil in the bottom half than at present because it is adding weight to the car and will not improve the cooling appreciably. We should like you to go ahead and get the two points we have mentioned instructed for an engine as soon as possible. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||