For all dwell times, the injection rates of the pilot injections are nearly identical. There are slight differences in the maximum rates between the injectors. For a dwell time of 1200 μs, the rates of injection for all three injectors increase at similar rates at the beginning of the main injection. However, injector A is characterized by lower maximum injection rates during the main injection, whereas injectors B and C are similar to one another. All three injectors behave similarly during the end-of-injection transient. At a dwell time of 400 μs, the rising edge of the main injection is steeper than for a dwell time of 1200 μs. However, the rate of injection momentarily stops increasing around 20 g/s, after which the rate of injection increases toward its maximum. The tops of the rate traces are generally flatter than for 1200 μs, and the maximum rates of injection are lower. This is an example of how changing the dwell time can be used to shape the rate of injection. As before, injector A's maximum rate of injection is lower than for the other two injectors, which have maximum rates of injection that are similar to each other. For a dwell time of 100 μs, the two injection events are very close to each other, but are indeed still distinct from one another. This very close spacing is made possible by the injectors' pressure-balanced control valves. For injectors B and C, the rising edge of the main injection is the steepest of all the data shown, and the ramp-up in the main injection is again interrupted. Injector A's rate of injection also increases very rapidly for a short time, but the rate then begins to increase at a slower rate and a boot-shaped profile is not observed. In fact, this rate of injection decreases slowly during the quasi-steady portion of the injection. The apparent ends of injection are different; the first zero crossings on the falling edge of the main injection lie as far as 150 μs from one another.