Want to calculate your injector duty cycle? Here is a simple calculator that will do that. This calculator will do it for both 2 Stroke and 4 stroke engines. Check with your injector builder on where he thinks the maximum duty cycle is for you specific injectors.
Typical injector limits for duty cycle is 80-85%. If you are runing over this it's time to look for a larger injector. Talk to some of the specialist before wasting money on the wrong sized injectors. RC Engineering is a good starting point as well as many other injector specialists.
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