So we got a three group linea in the shop, we fixed it up a bit (allot) and it runs great. . . . Except this one issue i have with it. There seems to be not one bit of pre infusion happening. The shots start pouring at 2-3 seconds! In my experience with these machines, some of the best shots have a 6-8 second pre infusion time. The old shop i worked at has the same machine, same portafilters, same pressure and water temp, what on these machines regulates the "pre infusion" time if any? there is a standing disagreement with a tec guy that we work with. He claims that the flowmeters play no role in pre infusion. Please help, this is driving me gonzo.
by the way, our group heads are out putting water at an extremely fast rate. i.e. i could take a portafilter out, place a 12oz cup underneath, turn the group on and will fill the cup in about 28-30 seconds! this seems like a very heavy flow.
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