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).
Cylinder block construction, discussing deflection, cooling, and joint face issues.
| Identifier | ExFiles\Box 178\4\ img063 | |
| Date | 20th October 1928 | |
| L.R. & V.A. T. & S. Cont'd etc. the new piece of cylinder block construction a certain amount of deflection of cranks and inserts must take place during running – particularly so with the light cast iron cranks and cylinder of our present construction. It is a matter of compromise. It therefore appears to be a good scheme to make it as rigid as possible consistent with weight and it is on that account that cooling must submit to a view of the position – in a view of the position that it originally just on the border line. From an oil consumption point of view we had no anxiety in changing the material from all sources etc., because the cast iron joint would be very tight, and would in fact add to the general flexibility of the construction. SUMMARY. The result of our investigation and cylinder block testing can be summarised as follows :- (1) After very severe sealed condition, with M.{Mr Moon / Mr Moore} Water inlet and test deposition – i.e. into a water jacket which had a temp. about the boiling point when blocked, we had only 0.2 cc. (12”) in 100/ min. on cyl. service which is about twice our present max. for cyl. tests so this test is at its w.m. limit. (2) The top surface of the joint face shows very rapidly and is extremely uniform and level. The most will be off 0.002”. Water side of the joint face, where, does not exceed 1/16”. (3) Whilst the diaphragms are very acute angled their stress is entirely pulling. (4) The minimum thickness is not proper for the cylinder water spaces to be as low as it was with good drilled face joints. However, if any experiments in this direction are required, we could have trouble later. | ||