Vacuum filter question
Thread Starter
Racer
Joined: Oct 2006
Posts: 488
Likes: 0
From: Australia Victoria
Vacuum filter question
I'm in the middle of replacing all my vacuum hoses and discovered this is missing and the hose runs straight through with no filter.
Is this an issue?
What is the purpose of this filter and should I track one down or reinstall without?
Thanks
Racer
Joined: Feb 2006
Posts: 361
Likes: 0
From: Valley AL
I thought just the opposite. That the filter was there to prevent trash(busted actuator, bad hose) from getting sucked into the engine. It is vacuum, not pressure.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
edit- here is a link to Zip's corrected diagram.http://www.zip-products.com/Zip/prod...45B882AA1F4055
Last edited by ...Roger...; Sep 5, 2008 at 11:13 PM.
Thread Starter
Racer
Joined: Oct 2006
Posts: 488
Likes: 0
From: Australia Victoria
As far as the filter, for now I'll leave it without but I'll be sure to add one to the next parts order I place.
Cheers
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The filter is to keep bits of trash (chunks of brittle hose, debris, etc.) from getting ingested into the engine/valves. With 30+ year old equipment, who knows what will break loose next? They're cheap...and good "insurance".
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Not so fast......I was always under the understanding that the filter was for the protection of the 3 port Trico check valve.I thought it kept fuel vapors from rising into the check valve and ruining it "after" the engine was shut off.
As far as debris getting into the intake manifold...it would have to be very tiny flecks if it could make its way through the check valve.
One other thought I seem to remember Paragon recommending buying the filter when you bought one of their new check valves to protect the new valve.In their catalogs they had little helpful hints about things like this.
As far as debris getting into the intake manifold...it would have to be very tiny flecks if it could make its way through the check valve.
One other thought I seem to remember Paragon recommending buying the filter when you bought one of their new check valves to protect the new valve.In their catalogs they had little helpful hints about things like this.
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Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Drifting
Joined: Nov 2002
Posts: 1,691
Likes: 204
From: Loveland, CO
I thought I remember something about it being a one-way check valve also, to maintain vacuum for a while when the engine is shut down. But, I could be mistaken since I am getting older.
Ralph.
Ralph.
Melting Slicks
Joined: Jan 2007
Posts: 2,589
Likes: 5
From: Salisbury Maryland
Team Owner
Joined: Sep 2006
Posts: 31,271
Likes: 4,362
From: Westminster Maryland
There is a check valve just beyond the filter. It also splits the vacuum supply to the dash controls and the vacuum storage tank.
I think it's a good idea to keep the filter. If GM didn't think it was necessary they'd have saved the couple of $ per car, you can be sure.
Regards,
Alan
I think it's a good idea to keep the filter. If GM didn't think it was necessary they'd have saved the couple of $ per car, you can be sure.
Regards,
Alan
Melting Slicks
Joined: Mar 2008
Posts: 2,989
Likes: 198
From: Meriden CT
Not so fast......I was always under the understanding that the filter was for the protection of the 3 port Trico check valve.I thought it kept fuel vapors from rising into the check valve and ruining it "after" the engine was shut off.
As far as debris getting into the intake manifold...it would have to be very tiny flecks if it could make its way through the check valve.
One other thought I seem to remember Paragon recommending buying the filter when you bought one of their new check valves to protect the new valve.In their catalogs they had little helpful hints about things like this.
As far as debris getting into the intake manifold...it would have to be very tiny flecks if it could make its way through the check valve.
One other thought I seem to remember Paragon recommending buying the filter when you bought one of their new check valves to protect the new valve.In their catalogs they had little helpful hints about things like this.
That's one trick filter that lets air go one way and "filters" out fuel vapors the other way.
Le Mans Master
Joined: Mar 2004
Posts: 7,493
Likes: 1,502
From: Little Rock AR
There is a check valve just beyond the filter. It also splits the vacuum supply to the dash controls and the vacuum storage tank.
I think it's a good idea to keep the filter. If GM didn't think it was necessary they'd have saved the couple of $ per car, you can be sure.
Regards,
Alan
I think it's a good idea to keep the filter. If GM didn't think it was necessary they'd have saved the couple of $ per car, you can be sure.
Regards,
Alan
If it was not a good item to have, GM would not have bought them and installed them.
The general has WAY more collective engineering experience than all of us guessers combined. It does not hurt efficency or performance so go ahead and use one.
...Unless your name is "Bubba" 
-Mark.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Thanks for the heads up ... I'll have to double check as the diagramI upload is not the one I have down the shed. I've been working off the printout I got from Willcox with the hoses, but it pays to doublecheck.
As far as the filter, for now I'll leave it without but I'll be sure to add one to the next parts order I place.
Cheers
As far as the filter, for now I'll leave it without but I'll be sure to add one to the next parts order I place.
Cheers
)