 Rear quarter panel vents (rear door jamb), Filters - which ones had them |
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Model Specific Information
914/4: 70 71 72 73 74 75 76 914/6: 70 71 72
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| Pat Garvey |
 Oct 20 2006, 04:06 PM
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#1
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Do I or don't I...........?  Group: Members Posts: 5,899 Joined: 24-March 06 From: SE PA, near Philly Member No.: 5,765 Region Association: North East States  |
The air vents in the rear door jamb (top). Some years had a round "hogs hair" type filter on the backside of the vent - my '72 has them.
Anyone know what years didn't have them? What other years did have them? Not one of those things a concours judge would ever check, but curious. |
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| AvalonFal |
 Oct 20 2006, 04:47 PM
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#2
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Member Group: Members Posts: 483 Joined: 3-July 05 From: Southern New Jersey Coast Member No.: 4,367 Region Association: MidAtlantic Region |
My '74 2.0L has them.
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| sixerdon |
Oct 20 2006, 05:44 PM
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#3
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Member Group: Members Posts: 466 Joined: 23-May 03 From: Dartmouth, MA Member No.: 731 |
Model year '70 & '71 did not have them. My sixes don't. Johnson book got that about right.
Don |
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| Porsche Rescue |
Oct 20 2006, 05:51 PM
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#4
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
A bit of a highjack, but......which way does the air flow to vent what?
Assuming the air flows from the cabin to the rear wheel house, why filter the air? Someone lead me to understanding! ( Maybe this belongs in the "mystery" thread) |
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| sixerdon |
Oct 20 2006, 06:02 PM
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#5
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Member Group: Members Posts: 466 Joined: 23-May 03 From: Dartmouth, MA Member No.: 731 |
I do know that the door vent is an exit vent for the cabin. But that is a good question. Why was it filtered from the interior. I also know that it saves a ton of weight not having them on the early cars.
And Pat, you should be checking them on your concours rounds. Another place to stick your finger. Don |
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| 9146FAN |
Oct 20 2006, 09:15 PM
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#6
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Member Group: Members Posts: 294 Joined: 20-July 04 From: ROSSMOOR, CA Member No.: 2,378 |
My understanding is the vents reduce the pressure in the cabin while closing the doors with the windows rolled up. They make the doors easier to close.
I don't know for sure why they went to the filter on later cars. My '70 /6 doesn't have them. (IMG:style_emoticons/default/biggrin.gif) |
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| sixerdon |
Oct 21 2006, 07:17 AM
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#7
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Member Group: Members Posts: 466 Joined: 23-May 03 From: Dartmouth, MA Member No.: 731 |
QUOTE(9146FAN @ Oct 20 2006, 07:15 PM)  My understanding is the vents reduce the pressure in the cabin while closing the doors with the windows rolled up. They make the doors easier to close. I don't know for sure why they went to the filter on later cars. My '70 /6 doesn't have them. (IMG:style_emoticons/default/biggrin.gif) True, pressure relief is part of the design. Been around for half century or more. More importantly, it allows for the fresh air to come in the grille on the cowl and exit through those vents. Flow through. Don |
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| Bleyseng |
Oct 21 2006, 09:51 AM
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#8
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
My 76 has them.
Porsche added the filters to capture water so the air ducts would rust quicker. (IMG:style_emoticons/default/headbang.gif) |
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| sixerdon |
Oct 21 2006, 10:10 AM
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#9
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Member Group: Members Posts: 466 Joined: 23-May 03 From: Dartmouth, MA Member No.: 731 |
QUOTE(Bleyseng @ Oct 21 2006, 07:51 AM) My 76 has them. Porsche added the filters to capture water so the air ducts would rust quicker. (IMG:style_emoticons/default/headbang.gif) ...and I thought they were smoke filters. Don |
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| tod914 |
Oct 21 2006, 04:05 PM
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#10
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Advanced Member Group: Members Posts: 3,755 Joined: 19-January 03 From: Lincoln Park, NJ Member No.: 170 |
They are Don, when you don't change your fuel lines often enough.
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| Pat Garvey |
Oct 21 2006, 06:09 PM
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#11
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Do I or don't I...........? Group: Members Posts: 5,899 Joined: 24-March 06 From: SE PA, near Philly Member No.: 5,765 Region Association: North East States |
Think I have to agree with the reason for the vents - makes it easier to close the doors without blowing the roof off.
But.....why filter the air LEAVING the cabin? Is it hooked up somehow to the engine intake system, so that unburned methane (farts in the cabin) can be recycled? Seriously, where does the air exit from these things? Sixerdon - can't check them for concours because you'd have to remove the vent cap - a no-no. Though it would be a great thing for a tie breaker. BTW, to show how anal I am, I run my filters through a diswashing cycle every couple of year (not including the heat dry cycle). I'll be the first to admit it's crazy, but has anyone tried to source these parts? It also gives me the opportunity to clean the channels. I know these were used from mid '72 thru '74, but what about the 75/76's? Attached image(s) 
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| Bleyseng |
Oct 22 2006, 09:35 AM
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#12
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
as I said they are present on 75-76 cars.
There is a port in the cabin targa pillar and then it routes to the fender port. Why there is a filter, I don't know other than they do clog with dirt and crap and will fill with water so the rust cycle begins.... Shine a flashlite into them and just look closely Pat as you can see in there if they are filtered or not. How many points to deduct? |
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| SirAndy |
Oct 22 2006, 12:56 PM
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#13
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Resident German Group: Admin Posts: 41,612 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Pat Garvey @ Oct 20 2006, 03:06 PM) What other years did have them? my '70 914-4 had 'em ... (IMG:style_emoticons/default/smile.gif) Andy |
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| SirAndy |
Oct 22 2006, 01:01 PM
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#14
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Resident German Group: Admin Posts: 41,612 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Pat Garvey @ Oct 21 2006, 05:09 PM) Seriously, where does the air exit from these things? simple, when driving, the air flowing by the door (gap) creates underpressure. that, together with the positive pressure from the cowl air-inlet, creates an air circulation through the car. the air exits through the vent-hole and out the door gap. the filter is for those times when you don't drive fast. like sitting in traffic on a windy day, air (and dust) would be pushed inside the cabin through the vents ... and yes, my '70 914-4 had them !!! (IMG:style_emoticons/default/smile.gif) Andy |
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| Pat Garvey |
Oct 22 2006, 07:30 PM
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#15
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Do I or don't I...........? Group: Members Posts: 5,899 Joined: 24-March 06 From: SE PA, near Philly Member No.: 5,765 Region Association: North East States |
QUOTE(SirAndy @ Oct 22 2006, 03:01 PM) QUOTE(Pat Garvey @ Oct 21 2006, 05:09 PM) Seriously, where does the air exit from these things? simple, when driving, the air flowing by the door (gap) creates underpressure. that, together with the positive pressure from the cowl air-inlet, creates an air circulation through the car. the air exits through the vent-hole and out the door gap. the filter is for those times when you don't drive fast. like sitting in traffic on a windy day, air (and dust) would be pushed inside the cabin through the vents ... and yes, my '70 914-4 had them !!! (IMG:style_emoticons/default/smile.gif) Andy Gee thanks Andy! You just destroyed a pattern! Looked like the early cars (70-mid '72) didn't have them & all the rest did. Now you have to come up with this 1970 that had them. So why have I seen so many early cars through the years without the filter? Jeez, is anything straightforward with these cars? Pat |
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| Bleyseng |
Oct 23 2006, 08:23 AM
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#16
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
QUOTE(Pat Garvey @ Oct 22 2006, 06:30 PM) Jeez, is anything straightforward with these cars? Pat Yes, they all rust! (IMG:style_emoticons/default/headbang.gif) |
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| Porsche Rescue |
Oct 23 2006, 09:21 AM
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#17
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Saving and Enjoying Old Porsches Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None |
If most early cars don't have them ( I know sixes I have owned did not), it could be that someone added them to Andy's car at some time in the last 36 years ( or removed them from my sixes, I guess).
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| davep |
Oct 23 2006, 10:11 AM
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#18
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914 Historian Group: Benefactors Posts: 5,137 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
The filters are more of a bug screen. Keeps wasps from nesting where you cannot get at them.
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| SirAndy |
Oct 23 2006, 11:06 AM
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#19
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Resident German Group: Admin Posts: 41,612 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Porsche Rescue @ Oct 23 2006, 08:21 AM) it could be that someone added them to Andy's car at some time in the last 36 years that certainly is a possibility ... my car had many PO's ... (IMG:style_emoticons/default/rolleyes.gif) Andy |
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| thesey914 |
Oct 23 2006, 11:48 AM
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#20
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Senior Member Group: Benefactors Posts: 1,155 Joined: 1-January 03 From: Staffordshire -England Member No.: 66 |
Its my opinion that these were added to help demist the rear screen
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