Opti vent line check valve and ??? - Page 2 - Chevy Impala SS Forum
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post #11 of 35 (permalink) Old 10-03-2010, 05:59 PM Thread Starter
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Dorman valve fits

This Dorman valve fits. It can replace the one way check valve.

Dorman - OE Solutions Vacuum Check Valve Universal - 47149


$4.99

We need to fabricate the restrictor/filter. Anyone have any ideas. How much flow needs to be restricted?

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Last edited by WindSSurfer; 10-04-2010 at 08:02 AM.
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post #12 of 35 (permalink) Old 10-03-2010, 06:07 PM
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Quote:
Originally Posted by WindSSurfer View Post
This Dorman valve works. It will replace the one way check valve.

Dorman - OE Solutions Vacuum Check Valve Universal - 47149


$4.99

We need to fabricate the restrictor/filter. Anyone have any ideas. How much flow needs to be restricted?

yeah screw chevy and there $60 for a new one.... i need to get some new filters for my homemade harness lol

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post #13 of 35 (permalink) Old 10-03-2010, 06:23 PM
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Quote:
Originally Posted by POPIMPIN CUSTOMS I.N.C. View Post
yeah screw chevy and there $60 for a new one.... i need to get some new filters for my homemade harness lol
A cigarette filter might work. LOL

There’s nothing as permanent as a temporary solution.

1995 Cadillac Fleetwood Brougham 108,XXX miles.
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post #14 of 35 (permalink) Old 10-03-2010, 10:04 PM
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Quote:
Originally Posted by HUF View Post
A cigarette filter might work. LOL


If their opti fails due to some Jerry rigged set up, $60 bucks will seem like cheap insurance.

I hate paying for something that doesn't seem priced fairly but time is $ and I'd end up paying $500 if I devoted the time in trying to build one versus making $.

I hope they can do it though and sell a bunch of them for $25 bucks.
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post #15 of 35 (permalink) Old 10-03-2010, 10:07 PM
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Quote:
Originally Posted by Garrison View Post


If their opti fails due to some Jerry rigged set up, $60 bucks will seem like cheap insurance.

I hate paying for something that doesn't seem priced fairly but time is $ and I'd end up paying $500 if I devoted the time in trying to build one versus making $.

I hope they can do it though and sell a bunch of them for $25 bucks.
Come on guys, let's come up with $15 vent harness. All we need is an accurate vacuum meter, new harness and some work to test homemade modifications.

There’s nothing as permanent as a temporary solution.

1995 Cadillac Fleetwood Brougham 108,XXX miles.
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post #16 of 35 (permalink) Old 10-03-2010, 10:22 PM
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I just offered $40 bucks for one. I don't even need one [and my car still isn't even drivable ~ unrelated issues] as mine is new but for $40 bucks I figured it was worth it as a spare so I'm really no help with a price point perspective.

I'll offer my support as I wouldn't have a clue where to start otherwise.
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post #17 of 35 (permalink) Old 10-03-2010, 11:42 PM
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need to find out what the orifice size is on the restrictor, might be under the part specs or in the fsm.
or take one apart and see.

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post #18 of 35 (permalink) Old 10-04-2010, 11:56 AM
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I followed this write up, mine ended being clean though.

http://www.9c1.net/forum/index.php?s...ic=174356&st=0&

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post #19 of 35 (permalink) Old 10-06-2010, 02:28 PM
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Quote:
Originally Posted by Marky Dissod View Post
I just took apart a V&V Harness ... for which I paid ... $50 ... plus $15 shipping ... ...

All the plastic orifices are the same size: 3/32" ID.

Using unexceptional lung power, I pulled and pushed air manually and individually, through each CHECK VALVE.

The larger of the two CHECK VALVES either contains (more likely), or is (less likely), the filtration media; based on the greater difficulty in pulling and pushing air through it (that, and I can't see through it either.

I could neither pull nor push air through either of the two CHECK VALVES 'from blue to white'. BOTH CHECK VALVES only permitted air to pass 'from white to blue'.

The filter on 'shoebox's V&V Harness is only solid blue, not twotone white & blue. Maybe his was merely a filter/flow reducer, but on mine, it's one of two CHECK VALVES.

1)
That neither explains nor justifies the egregiously brazen and ridiculous markups.
(I've heard of Lexus charging $800 for a CMOS battery, by the way, so I'm not surprised, just angry.)

2)
Though I'll admit that it doesn't answer the question of how much flow needs to be restricted ... how many combo CHECK VALVE/filter/flow reducers of that specific physical configuration could there really be?

3) Since it's apart ... with what, and how, do I test the check valve/filter/flow reducer's restrictive value?
The write-up Henry '06 was referring to will answer your questions:

"...If you don't find yourself replacing the harness, there is a way to clean the piece that causes the most problems: the pinhole check valve.

Before I explain that, please note that there are two check valves in this system. The first is located closer to the intake manifold on the driver's side. The vacuum line attaches to a nipple on the side of the aluminum manifold and runs to the first check valve. This first valve is called a "one way" valve (#1 in the diagram above). It typically doesn't go bad very often. But it should be inspected as well. If you blow through it, air will only go one way.

The second valve in the chain (the pinhole valve, or GM calls it a filter) is the one that causes the most problems. This is #2 in the diagram above.

It is located about here, though it could be further back toward the intake manifold on some cars. I've relocated/unburied mine since I like to check on this and keep it clean:

Remove it from the vacuum line by giving each tube a tug on each side.

Once removed, it looks like this. Note that one end is open plastic, and the other has a metal insert/collar as shown. This side is actually the location of the pinhole.

You can hold the valve up to a bright light source to inspect the pinhole. You should see a small point of light pass through as shown.

If light does not pass through or you feel like cleaning it anyways, then stick a very small pin or piece of wire. In this example, I stripped a twisty tie. Even that was a little too thick. A pin or a needle with a sharp point is best for this job. "


What I do not understand is how a pinhole can act as an unidirectional check-valve.

There’s nothing as permanent as a temporary solution.

1995 Cadillac Fleetwood Brougham 108,XXX miles.

Last edited by HUF; 10-06-2010 at 02:44 PM.
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post #20 of 35 (permalink) Old 10-06-2010, 04:38 PM
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Quote:
Originally Posted by HUF View Post
What I do not understand is how a pinhole can act as an unidirectional check-valve.
I don't believe its a check valve so much as its a restriction orifice.

The check valve is one way and is the check valve.

The second part is the pinhole and is just a flow restrictor. It works exactly like restrictor plates in Nascar.

And rather than dig our my fluids text books I'm going to leave it at that.

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