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).
The 10,000 miles test of the latest type of split aluminium pistons.
| Identifier | ExFiles\Box 77\3\ scan0110 | |
| Date | 9th February 1920 | |
| COPY. <X-3457> Hs.{Lord Ernest Hives - Chair} from EP.{G. Eric Platford - Chief Quality Engineer} c. to BN.{W.O. Bentley / Mr Barrington} c. to Wor.{Arthur Wormald - General Works Manager} C.K. EP{G. Eric Platford - Chief Quality Engineer}2/F9.2.20. X 3757 RE 10,000 MILES TEST OF LATEST TYPE SPLIT ALUMINIUM PISTONS. Yesterday's run on chassis 36-TW 260 miles. Total miles run since pistons fitted 4158 . Report:- Cylinders and pistons very heavily carbonised, and tendency to seize on top band of No.2 piston. One or two rings stick in groove, as noted by Hs.{Lord Ernest Hives - Chair} Engine re-built as dismantled except rings eased in grooves by paraffin only. No carbon removed from pistons or cylinders. CLEARANCES OF ABOVE PISTONS (WHEN NEW) - Stops. Skirt. Gudgeon Pin. Stops. Body. Gudgeon Pin. 1. .001 .006 .008 .003 .008 2. .001 .008 .003 .008 3. .002 .006 .003 .008 4. .003 .006 .004 .008 5. .0025 .006 .003 .007 6. .003 .006 .0035 .007 PISTON CLEARANCES AFTER 3640 MILES:- Skirt. Gudgeon Pin. Stops. Body. Gudgeon & Pin. 1. .002 .008 .004 .008 2. .0035 .008 .0055 .008 3. .0035 .007 .0055 .007 4. .004 .008 .005 .0075 5. .0025 .0065 .005 .007 6. .003 .008 .005 .008 & EP.{G. Eric Platford - Chief Quality Engineer} | ||