Washer Nozzles Options

[yeahmag]

Seems like there is some wild pricing from cheap to expensive on replacement washer nozzles for the 914. Anybody have a recommended replacement?

[914Sixer]

Autohausaz.com
Chrome with check valve $19.55 70-73
Black plastic $5.27 74-76

Both have adjustable sprayer.

[kgruen2]

Autohausaz.com
Chrome with check valve $19.55 70-73
Black plastic $5.27 74-76

Both have adjustable sprayer.

What do the check valves under the nozzles check? Are they necessary? There appears to have been a change in the nozzles in mid '74. What is the difference in the earlier ones and the new and improved later ones? Are they interchangeable?
I switched my pneumatic system to an electric pump system. Would that make a difference? Any thoughts?

[jkb944t]

Autohausaz.com
Chrome with check valve $19.55 70-73
Black plastic $5.27 74-76

Both have adjustable sprayer.

What do the check valves under the nozzles check? Are they necessary? There appears to have been a change in the nozzles in mid '74. What is the difference in the earlier ones and the new and improved later ones? Are they interchangeable?
I switched my pneumatic system to an electric pump system. Would that make a difference? Any thoughts?

I believe that the check valve is to prevent the low pressure area created by the windshield from siphoning out all of the windshield fluid especially at high speeds.

Jeff B

[BillC]

Autohausaz.com
Chrome with check valve $19.55 70-73
Black plastic $5.27 74-76

Both have adjustable sprayer.

What do the check valves under the nozzles check? Are they necessary? There appears to have been a change in the nozzles in mid '74. What is the difference in the earlier ones and the new and improved later ones? Are they interchangeable?
I switched my pneumatic system to an electric pump system. Would that make a difference? Any thoughts?

I believe that the check valve is to prevent the low pressure area created by the windshield from siphoning out all of the windshield fluid especially at high speeds.

Jeff B

Actually, the base of the windshield is a high pressure area. That's why the fresh air intake is there (and why cowl-induction hoods were invented).

The check valves are to keep the washer fluid from draining back into the reservoir, which would cause a delay in squirting when the washers are activated.

[jkb944t]

Autohausaz.com
Chrome with check valve $19.55 70-73
Black plastic $5.27 74-76

Both have adjustable sprayer.

What do the check valves under the nozzles check? Are they necessary? There appears to have been a change in the nozzles in mid '74. What is the difference in the earlier ones and the new and improved later ones? Are they interchangeable?
I switched my pneumatic system to an electric pump system. Would that make a difference? Any thoughts?

I believe that the check valve is to prevent the low pressure area created by the windshield from siphoning out all of the windshield fluid especially at high speeds.

Jeff B

Actually, the base of the windshield is a high pressure area. That's why the fresh air intake is there (and why cowl-induction hoods were invented).

The check valves are to keep the washer fluid from draining back into the reservoir, which would cause a delay in squirting when the washers are activated.

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

[BillC]

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.

[kgruen2]

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?
Also, I hooked up the nozzles without the check valves and found that the left one bleeds (IMG:style_emoticons/default/confused24.gif) fluid when I'm driving and does not spray well. The right one does not leak fluid while driving and sprays good. (IMG:style_emoticons/default/confused24.gif)

[BillC]

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?

Also, I hooked up the nozzles without the check valves and found that the left one bleeds (IMG:style_emoticons/default/confused24.gif) fluid when I'm driving and does not spray well. The right one does not leak fluid while driving and sprays good. (IMG:style_emoticons/default/confused24.gif)

Sounds like you may have a defective nozzle.

[kgruen2]

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?

Also, I hooked up the nozzles without the check valves and found that the left one bleeds (IMG:style_emoticons/default/confused24.gif) fluid when I'm driving and does not spray well. The right one does not leak fluid while driving and sprays good. (IMG:style_emoticons/default/confused24.gif)

Sounds like you may have a defective nozzle.

A couple of cups worth. Drove the mechanic crazy trying to balance it. Then i tried it (I considered myself an expert at balancing tires and tried to keep the needle within one needle width of the 0 mark (before digital balancers). Couldn't keep it on balance until we realized there was water inside. Don't remember if it was straight water or windshield washer fluid. Would have to have been a lot of dynamic pressure to reverse the flow from the reservoir to the tire.

I am still working on proper installation of nozzles and the sprayers haven't been aimed yet. Will update with reults.