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).
Procedure for dynamometer testing of a Terraplane engine, detailing the break-in process and performance evaluation.
| Identifier | ExFiles\Box 173\2\ img183 | |
| Date | 9th February 1934 | |
| If you run the Terraplane on the dynamometer follow this running in scheme. February 9, 1934 GURLY Procedure followed for dynamometer tests - Breaking in process - Start in at 1200 rpm - no load - for 3 hours Go to 1400 " - " " - " 3 " " " 1600 " - " " - " 3 " " " 1800 " - 10 lb. load / " 3 " Continue on up until 3600 rpm is reached, adding 10 lb. load at each 200 rpm increase in speed, running at each speed for 3 hours. Full load is usually reached around 3,000 rpm on the 6 cylinder motor, which gives about 9 hours of running after full load has been reached. Due to the fact that the '8' pulls more load, the increase is in 20 lb. increments. Motor is then ready for dynamometer test, but if it is possible to run motor for longer period beyond 3600 rpm point, this is done as friction horsepower is still usually high and they continue to run motor at high speeds to break this down, if possible. They then get oil to 150° " water to 150° Set to idle. Then warm job up again at 2000 rpm to get all cleaned out from any loading that occurs from idling. Try to maintain an average temperature. Air temperature has a tendency to increase as the speed increases - Therefore, they try to warm motor up until the temperature is about 80° and then as temperature increases, open windows to keep it at about 80°. Start in at 400 rpm and determine best power spark. Then record spark, load, carburetor air temperature, manifold vacuum, water temperature, oil temperature. Then go to 600 rpm and make similar records, repeating this procedure at each 200 rpm increase in speed until the peak is reached. If peak is not reached at 4000 rpm, go to 4200 rpm, and if not there, go to 4400 rpm. Each speed is held until load and temperature are constant. Follow power run to determine friction horsepower. | ||