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).
Unsatisfactory Zephyr type pistons causing knocks and failures, intended for an after-the-war chassis.
| Identifier | ExFiles\Box 19\2\ Scan078 | |
| Date | 22th October 1918 | |
| X.Y62 X.2565. To R.{Sir Henry Royce} from EH. c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c.to EP.{G. Eric Platford - Chief Quality Engineer} EH1/LG.221018. X.2762 X.762. X.3014 X.3082 X.2565 X.3129. X.2748 X.2369 RE AFTER-THE-WAR-CHASSIS We understand it has been agreed to put an order of 1000 sets of parts similar to 7-CA. We should like to bring forward the following main points which we consoder are not satisfactory on 7-CA. X.2748. X.2369. (1) PISTONS These are the Zephyr type with the marrow rings and long skirt. The pistons on 7-CA. have run 2000 to 3000 miles. Another set of these pistons have been running Commander Briggs' late car for 30,000 to 40,000 miles. Two of the pistons on this car have smashed; they appear to have broken through the gudgeon pin boss. These pistons have not the additional webs for strengthening the gudgeon pin boss, as we now use the aero engine pistons. All the pistons we have tried of this type have had pistons knocks more or less. We cannot guarantee absence of piston knocks with any aluminium pistons. From the experinece of our customers before the War, we think very few of them will tolerate piston knocks. The advantagesof the aluminium pistons are not obviously apparent to the customers, especiallyu in the case of an old lady's car, but piston knocks to any dregree are, to say the least, very irritating. We suggest that ou | ||