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).
Piston clearance, cold-engine knock, and testing with a stroboscopic telephone.
| Identifier | ExFiles\Box 180\M2\M2.4\ img022 | |
| Date | 1st April 1921 guessed | |
| Contd. -3- pistons is .006" to .004". With this clearance, of course, we should expect that some of these pistons will knock when cold. We consider this split piston is a hopeful proposition and we should like Mr. Royce to confirm that he agrees with us continuing the tests with these pistons in parallel with other experiments. We have spent some time in conjunction with Mr. Clark to try and get the stroboscopic telephone working properly. So far we have found it very difficult to overcome the noise of the clicking caused by the making and breaking the circuit. We can hear the piston knocking in the telephone quite distinctly, more distinctly than standing close to the engine. EH. | ||