QUOTE(kgruen2 @ May 26 2017, 01:09 PM)
QUOTE(BillC @ May 26 2017, 05:39 AM)
QUOTE(jkb944t @ May 26 2017, 07:49 AM)
I stand corrected as that makes sense to me that it is a high pressure zone but I still think it can pull the fluid out due to the venturi effect as the air passes over the nozzle.
Jeff B
Because that is a high-pressure area, it also means it's a low-flow area. The pressure is higher than any suction from any venturi effect. In fact, the pressure is higher than the pressure inside the trunk, so this would have the effect of pushing the fluid out of the nozzle and back into the reservoir, hence the need for the check valve.
Plus, if the check valve were oriented so that it would keep fluid from being sucked out of the nozzle, it would also prevent the fluid from being sprayed out.
I was a Service Advisor at Merlin Olsen Porsche/Audi in the mid '70's. We tried to balance the spare tire from a 914 and found it to have a lot of water inside. Think that might be connected to this post somehow?
How much water are you talking about? A couple of teaspoons worth, or more like cups or even quarts? A few teaspoons worth could be caused by using soggy air, like from a compressor run hard on a humid day.
If it was more than that, I don't know what to tell you. Normally, the air pressure in the spare tire is far, far higher than the dynamic pressure at the base of the windshield, unless maybe they went supersonic. Was the water blue, like "standard" fluid, or was it clear or some other color?
QUOTE(kgruen2 @ May 26 2017, 01:09 PM)
Also, I hooked up the nozzles without the check valves and found that the left one bleeds
fluid when I'm driving and does not spray well. The right one does not leak fluid while driving and sprays good.
Sounds like you may have a defective nozzle.