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).
Engine horsepower tests related to induction pipe heating and progress on swaging cylinder tubes.
| Identifier | Morton\M1.1\ img015 | |
| Date | 11th August 1921 | |
| Contd. -2- Hsl/LG11.8.21. *********** it would be very serious. As regards the tubes through the cylinders. Mr. Coverley has made good progress on this job. he has made a tool for swaging these tubes out under a drilling machine and on the sample ones that have been done, the tubes on there own without the conical sleeves have remained tight with a pressure of 100 lbs. We have carried out some horse power tests on the engine to prove exactly how much power we lose by heating up the induction pipe. To do this we have tested the engine first with free exhaust, next with the exhaust pipe fitted but with it turned the opposite way to standard so that there was no exhaust heat on the hot spot on the induction pipe. We then made a further test with the exhaust pipe fitted as standard so that the hot spot was in operation. The reason we did this test was, we thought from the appearance of the exhaust pipe bolted to the engine that we might have been losing a little power there. The tests show there is a very slight drop at 3000 revs. which we should not consider serious. | R.P.M. | Free Exhaust. | Exhaust pipe. No hot-spot. | Exhaust pipe. Std. hot-spot. | | :--- | :--- | :--- | :--- | | 500 | 10.4 | 10.4 | 10.4 | | 1000 | 22.5 | 22.5 | 21.25 | | 2000 | 46.25 | 46.25 | 42.7 | | 3000 | 60 | 57.5 | 52.5 | We have had one exhaust pipe break on the engine. What happened was that the engine had been running full power and contd:- E R 385A (100 T/S) H.S. 150.11-20) G 2600 | ||