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).
Patented 'Areolite' piston design and its effectiveness in reducing piston knock.
| Identifier | ExFiles\Box 48\1\ Scan097 | |
| Date | 11th February 1918 | |
| R.R. 235a (500 T) S.D. 408. 26-4-17.) Bm. 2/156/13. X4190 11th February - 1918. To EH. from BY.{R.W. Bailey - Chief Engineer} BY28/P11218. RE PISTON AND PISTON ENDS. AREOLITE PISTONS. I attach herewith an illustration of a scheme that the above Company have patented, to obviate or cut out piston slack or knock, I do not consider the scheme is any good, in view of the fact, that the skirt which is split as shewn, will carry practically no working load. It is only good from the point of view of filling the cylinder. I thought that probably you might be interested in seeing what would happen on a car piston so situated, as it apparently would reduce knock, but since it cuts out bearing surface and the possibility of a scraper ring, there would apparently not be much final gain. BY.{R.W. Bailey - Chief Engineer} | ||