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).
Reduction in engine oil consumption after fitting Zephyr pistons.
| Identifier | ExFiles\Box 144\3\ scan0014 | |
| Date | 10th December 1914 | |
| Wor{Arthur Wormald - General Works Manager}/EHH/L101214 Re Oil Consumption. J.{Mr Johnson W.M.} 10-12-14. R.{Sir Henry Royce} B. Ns.{Norman Scott} On the same engine that we were using .044 lbs of oil per HP hour we fitted the Zephyr pistons and found that we could run these full power without the extra oil on at all. The oil consumption is now .021 lbs per HP hour. We do not lose any HP neither does the petrol consumption go up by not using the extra oil. E.H. x986 | ||