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).
Porosity issues with a special 'H' Alloy aluminium piston and proposed casting solutions.
| Identifier | ExFiles\Box 37\3\ scan 031 | |
| Date | 21th May 1919 | |
| R.R. 199 (500 H) (SD. 296. 15.8.17) M.P. 176549. BY1/H.21.5.19. ------------ Mr.Hives. from BY.{R.W. Bailey - Chief Engineer} c. to EFC. c. to BN.{W.O. Bentley / Mr Barrington} ------------ CHASSIS. SECTION PISTONS. X 3198 ------------ Referring to the special "H" Alloy in Aluminium, in which a number of pistons have been submitted to you, could you let us have any reports on the subject at all, as apparently the material in question is less liable to porosity, whilst having a higher 'yield point', and at the same time apparently as good wearing qualities as the standard piston alloy. A report on this subject would be of interest to everybody concerned, as the Works are undoubtedly producing a lot of scrap, due to increased porosity in the present alloy. I am asking Mr.Hall to try casting some pistons in the standard alloy at a lower temperature than was used for the Aero Pistons. In view of the fact that the Car Piston contains approximately twice the section as regards bulk of aluminium, I am inclined to think the porosity is due to this fact. BY.{R.W. Bailey - Chief Engineer} | ||