Figure 1 gives the performance characteristics for a water brake dynamometer. Fi

Question

Figure 1 gives the performance characteristics for a water brake dynamometer. Figure 2 shows performance curves for a four stroke spark ignition engine. Can this engine be fully tested using the dynamometer of figure 1. Explain your answer.

200 240 Maximum Load 150 220 200 100 160 Brake 320 280 240 50 120 Minimum Load 80 0.6 0.5 0.4 ,000 2,000 3,000 4,000 40 Speed (rpm) Figure Water Brake Performance From Obert (Ref. 1) 1,000 2,000 3,000 4,000 5,000 6.000 Speed (rpm) Figure 2- Engine Performance From Obert (Ref. 1)

Explanation / Answer

The range of performance of modern engines demands dynamometers that are of the highest quality technologically, but are also highly reliable and equipped with precise measurement devices.

Suitable for regular tests on engines, running-in schedule, performance tests, LD and HD emission cycle tests.

Normal functional tests such as cooling, lubrication, air intake, exhaust, fuel injection and fuel consumption, tests for external characteristics, acceleration tests.

The dynamometer can be used for power absorption and determining the engine power developed at various speeds.

This is how the dynamometers are used for testing the engine completely. We can directly calculate the performance of the engine by dynamometers

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