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).
Analysis of deposit from a piston head, detailing its chemical composition.
| Identifier | ExFiles\Box 145\2\ scan0004 | |
| Date | 19th January 1932 guessed | |
| 3. The deposit from the piston head was quite different from the others :- Free Oil 18.31 Sol. in Benzene 2.68 Insol. " 75.31 Mineral Matter 3.70 The Mineral Matter contains :- Silica and insol. 10.42 Iron Oxide 88.33 Calculated on an oil-free basis :- Benzene soluble 3.28 " insol. 92.19 Mineral Matter 4.53 On an oil and ash free basis :- Benzene soluble 3.57 " insol. 96.43 At once we see a very marked difference between the composition of the deposit on the piston head from that on the other parts in fact, we have never seen such a very marked difference before and we are at a loss to explain it. We carried out an ultimate analysis with the following results :- Carbon 76.40 Hydrogen 5.40 Oxygen 13.85 Mineral Matter 4.35 ------- 100.00 Unfortunately we had not sufficient of the deposit to separate into fractions as we should have wished, consequently the ultimate analysis was made on the deposit, but if we re-calculate these figures on an oil-free basis, the results would probably be as follows :- | ||