Quote:
Originally Posted by MEMPHIS91
Ah ok so no TXV. Looking at my numbers I still think I can go shorter on the cap tube. When first starting running test the cap tube would "squirt" and visibly shake at about 14 psi. That shaking doesn't start til 27psi now.
I am wondering if a larger diameter and longer cap tube might not work better for this.
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The initial rumble is from your condenser reaching its critical point. At startup, as much of the liquid that will condense will be in the coldest section. This will be your borehole, or in winter, the outdoor plumbing. When the compressor starts, this liquid quickly boils off to pressurize the condenser. Until you develop subcooling, the liquid will not stay that way in the cap tube.
Don't worry about your cap tube being too short until it is less than a foot long. Most vehicles without txv metered evaporator cores have a cap tube about 4 inches long in them. This is why they start putting out cold air quickly after you start the car.