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Posted by: forrestkhaag Sep 21 2015, 07:24 PM

Alternative Ventilation
Has anyone perfected a simple interior ventilation system once the hvac is blanked off and deleted in an early 914?

My goal is to have a two-sided control total mechanical system to shove some fresh air into the cabin when the windows are up / one side or the other or both / not to the windshield but to the lower cabin only.

In SoCal, we have no humidity, no rain, no inclement weather, not one single bug, no latent dust (unless behind a 6…, and no particulate allergens or pollen, so I am thinking that the system will be an add-on to my tow bar hitch receiver tubes subtly located thru the front bumper and in to the front trunk bay… but…. from there, things get difficult due to this big bulbous thing called a fuel tank…..

I know from many removals and insertions of the tank that there is no room for two flexible tubes to make their way thru the tank cavity unless we agree to go electric.
So, maybe someone has another route for two individually mechanically controlled vent tubes to the front cabin.

Of course, the Germans used the cowl vent to drain rain and to power up ventilation to the cabin and windshield. I am looking for a simple alternative.. Any suggestions are appreciated.

Posted by: SirAndy Sep 21 2015, 07:30 PM

While this is from an aftermarket heater unit, the air routing over the tank would work in your case.

Posted by: 914_teener Sep 21 2015, 07:35 PM

I don.t get why the stock fresh air intake won.t work?

It is simple but a PITA to take apart and reinstall.

Posted by: 914Mike Sep 22 2015, 12:11 AM

I have run oil lines under the tank through the little tunnel inside the wheel arch. Starts at the gas tank bulkhead and runs down to the footwell. Poke a few holes, add some tubes, cool your feet at least. The back side tends to be rusty anyway, very easy to perforate...

Posted by: jim_hoyland Sep 22 2015, 05:07 PM

How about a roof vent ?


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Posted by: Kansas 914 Sep 22 2015, 05:24 PM

i am thinking about a bilge blower to replace the fresh air blower up front since my car has Kerry Hunter headers and no heat. It would be nice to have real forced air through the vents.

http://www.amazon.com/Rule-140-Marine-Blower-3-Inch/dp/B000O8AZ8K

Posted by: 76-914 Sep 22 2015, 06:35 PM

QUOTE(914_teener @ Sep 21 2015, 06:35 PM)

Posted by: Chris914n6 Sep 22 2015, 06:59 PM

I read and I got confuzed...

The cowl vent allows a good amount of air to pass into the cabin when restrictions are removed. As in the air box is removed.

Or... air ducts/blower in the back passing thru the longs into the cabin, or piped into the side vents.

Or take apart the flapper boxes and block off the windshield path, leaving the side vents and floor opening.

Posted by: 914_teener Sep 22 2015, 07:22 PM

QUOTE(76-914 @ Sep 22 2015, 05:35 PM)

QUOTE(914_teener @ Sep 21 2015, 06:35 PM)

I don.t get why the stock fresh air intake won.t work?

It is simple but a PITA to take apart and reinstall.

I fart with more force than that anemic OEM vent system puts out. Another BIG + when one does a water cooled conversion and AC

Posted by: 7TPorsh Sep 22 2015, 07:30 PM

QUOTE(Kansas 914 @ Sep 22 2015, 04:24 PM)

Posted by: barefoot Sep 22 2015, 07:43 PM

QUOTE(Kansas 914 @ Sep 22 2015, 07:24 PM)

Posted by: 914_teener Sep 22 2015, 07:49 PM

QUOTE(barefoot @ Sep 22 2015, 06:43 PM)

QUOTE(Kansas 914 @ Sep 22 2015, 07:24 PM)

i am thinking about a bilge blower to replace the fresh air blower up front since my car has Kerry Hunter headers and no heat. It would be nice to have real forced air through the vents.

http://www.amazon.com/Rule-140-Marine-Blower-3-Inch/dp/B000O8AZ8K

I installed one like this bilge blower in my boat to purge the motor cavity. The stock 914 vent blower puts out more air.

Posted by: Krieger Sep 22 2015, 08:26 PM

There was this a few years back from a post by Trekkor.



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Posted by: Larmo63 Sep 22 2015, 09:24 PM

Forrest's car is early, no dash vents.

Posted by: screenguy914 Sep 23 2015, 11:59 AM

Bilge blowers are efficient and relatively inexpensive. Racers sometimes use them to duct forced air to help cool brake components and fluid coolers.

However, depending on their placement, they may be excessively noisy when used to source cabin air. I use a 4" Spal fan to help evacuate trunk air from a front oil cooler. However, its sound isn't noticeable during normal operation unless the engine is OFF.

Sherwood