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General Testing Information
Volume 3, 9/10/04
Appendix A - Page 199
Appendix A
General Testing Information
A.1 Torque Capacity Rating
The SuperFlow hydraulic dynamometer carries a nominal capacity rating of 1000 lbs-ft,(1350N-m),
of torque and 1000 HP (750kW). This can be upgraded to 2000 lbs-ft (2700N-m) via an optional
strain gage. Nevertheless, the endurance limit of the shaft is much less. While many of our users
have run numerous tests in the 800 to 1500 lb-ft, (1100 to 2000N-m) range, these have typically
been short in duration. When endurance tests are run for hundreds of hours, the maximum torque
limit is 430 lbs-ft,(580N-m) for 833 absorbers. If you run for a long period of time at a level above
430 lbs-ft, the shaft will break eventually. SuperFlow 871 absorbers have twice the endurance
limit.
The maximum power is limited first by the maximum torque the absorber can resist at a given
speed, and second by the maximum water flow rate through the dynamometer. The standard
straight vaned absorber will not reach 1000 lbs-ft, (1350N-m), of torque until approximately 4000
rpm in pressure boost mode, and the optional angled vane absorber will not reach 1000 lbs-ft of
torque until approximately 2800 rpm in pressure boost mode.
As speed increases to the 6000 to 8000 rpm range, the outlet water temperature of the
dynamometer begins to rise to above our recommended limit. We prefer to keep the dynamometer
outlet water to 160F (70C). The faster you run the engine, the hotter the water becomes and at
approximately 8000 rpm, the absorber may exceed the maximum operating temperature.
Your dynamometer will not simply fail at that point, but it may begin to show some steam and there
may be some difficulty in holding the load. One good solution to this is to run low temperature inlet
water to the dynamometer when you have a very high power engine. The dynamometer capacity
on 50F (10C) inlet water is considerably greater than it is at 100F (38C) inlet water.
If you exceed 1000 hp (750kW), there is not necessarily any damage to the dynamometer. We
have had documented reports of customers running as high as 2800 hp (2088kW) through the
dynamometer for brief periods.