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On 20 Sep 2006 at 11:12, Constantino Tobio wrote: > I actually made a leak tester for my injectors. Essentially I made a > "tank" made of 4" PVC pipe (has a volume of maybe 20 oz), a 5/16 hose > barb, a pressure gauge, and a quick disconnect for my compressor. I've actually got an alum can for the injectors to spray into and a lucite lid to hold a pair of injectors in the usual geometry. I just have to add a pump, filter, pressure regulator, some support framework, and plumbing. > I fill up the "tank" about halfway with kerosene and I put the injector > on a hose. I pressurize the "system" to 30 lbs by setting the compressor > regulator to this. I leave the injector in a mason jar and see if it > leaks after a few hours. That seems like a pretty reasonable way to do a simple leak test. A leak that takes more than 15 minutes to show up is probably not significant enough to matter. > As for exercising them. I imagine you could somehow rig an ecu, feed it > power and pressurized fluid to the injectors, and have something that > would oscillate the trigger contacts circuits. Am I on the right track > here? Or would it be simpler to oscillate an electrical signal at the > right voltage for the injectors while delivering pressurized liquid? > Someone with knowledge of simple electrical circuits could probably > design this easily and make it in a breadboard. I've got an exercise circuit on a breadboard, but I need to resurrect it and make a permanent version. It's adjustable in pulse frequency and pulse width. Once done, I need to mount it to the same framework and set it up to get power from the same 12 V source as the pump. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~