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).
Connecting rod deflection tests and an analysis of engine knock sounds.
| Identifier | ExFiles\Box 35\2\ scan 128 | |
| Date | 20th September 1919 | |
| R.R. 250 x 100 T(H.F. Sta. (8-4-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2354 -4- EH1/LG20.9.19. Contd. LOAD REQUIRED TO DEFLECT RODS. We have measured the load required to deflect a standard connecting rod various amounts. Below are the figures. Weight applied on bar lbs. Deflection. 10 .005" 20 .009" 30 .015" 40 .019" 50 .023" ANALYSIS OF KNOCKS. We have also rigged up a telephone in conjunction with the contact breaker so as to find out at what position of the stroke the piston knocks. We have got so far as to know that one can hear a piston knock distinct over other noises on the telephone and that with the circuit broken by means of the contact breaker we can find the position where the noise goes off and on. At present we are not satisfied because the contact breaker itself makes a distinct noise on the 'phone. X.3651. We have also carried out an experiment to try and find against which side of the cylinder the piston knocks. We arranged a piston so that at the top of one side there was a rubber pad. We were only analysing for knocks when the engine was cold so that the pistons did not have a chance to get hot enough to destrwy the rubber. Contd. | ||