<VV> '61 Fresh Air Plenum

Tue Sep 18 21:50:36 EDT 2007

Well, I don't live in Hawaii, and hot air holds more moisture than cool 
air. Hence ot air defogs better than cool air.

The A/C removes the moisture from the air by condensing it out, 
something same temperature air cannot do. Same as in inside and outside 
air being the same temperature. No humidity change there. Now cool the 
air below dew point, and the water drops out. That is why the windshield 
forms water drops, so same temperature air will just drop more water 
onto the windshield.

Frank DuVal

People in dry climates play by different rules....

Ron wrote:
> There are times when you may want to defog but you don't want any 
> heat. This is very common in Hawaii where the windows fog up when you 
> have the AC on.  And, that's why my '75 Olds chills the defrost air to 
> dry it before blowing it on the windshield.  The Corvair allows you to 
> blow unheated air which is a benefit in warm, humid conditions.
> RonH
>
> ----- Original Message ----- From: "Bill Hubbell" <whubbell at umich.edu>
> To: "'Ron'" <ronh at owt.com>; "'Kent Duncan'" <kent_duncan at yahoo.com>; 
> <virtualvairs at corvair.org>
> Sent: Tuesday, September 18, 2007 11:24 AM
> Subject: RE: <VV> '61 Fresh Air Plenum
>
>
>> How do you figure, Ron?  The heat from the bottom of the engine 
>> should clear
>> your windshield very quickly, unless, of course, you just drove 
>> through a
>> deep puddle of water.  Even if that is the case, I don't really see 
>> how the
>> upper shroud air would help, because once the water gets into the 
>> system you
>> need heat to vaporize it.
>>
>> All I know is that on my 1964 sedan with a completely rebuilt and 
>> perfectly
>> working fresh air heater, I never use the "Air" control - it just 
>> doesn't
>> add anything useful.
>>
>> Bill Hubbell
>>
>>
>> -----Original Message-----
>> From: virtualvairs-bounces at corvair.org
>> [mailto:virtualvairs-bounces at corvair.org] On Behalf Of Ron
>> Sent: Tuesday, September 18, 2007 2:11 PM
>> To: whubbell at umich.edu; 'Kent Duncan'; virtualvairs at corvair.org
>> Subject: Re: <VV> '61 Fresh Air Plenum
>>
>> The kick panel vents don't help your defroster one bit and that's 
>> what that
>> upper shroud duct is for.
>> RonH
>>
>> ----- Original Message ----- From: "Bill Hubbell" <whubbell at umich.edu>
>> To: "'Kent Duncan'" <kent_duncan at yahoo.com>; <virtualvairs at corvair.org>
>> Sent: Tuesday, September 18, 2007 10:01 AM
>> Subject: RE: <VV> '61 Fresh Air Plenum
>>
>>
>>> Corvairs could be equipped with a "Heater Delete" option (often done in
>>> warmer climates), in which case not only would the engine top shroud be
>>> blocked off but also the lower shrouds, all the holes in the car for 
>>> the
>>> heater hoses, and the heater motor and plenum would be missing, as 
>>> well as
>>> the heater control, cables, and wiring.  If this is the condition of 
>>> your
>>> car you will have nothing to hook up a hose to (and if this is 
>>> indeed what
>>> your car is like, please send me the Fisher Body tag information or 
>>> better
>>> yet, a clear photo of it as it will help us in our quest to decipher 
>>> the
>>> accessory codes)
>>>
>>> However, more than likely, somebody just blocked off the upper shroud.
>>> The
>>> primary reason: many people feel that the "fresh air" outlet off the 
>>> upper
>>> shroud robs the engine of essential cooling air (especially cylinder 
>>> #5)
>>> leading to early engine failure.  Besides, you can always get cool 
>>> fresh
>>> air
>>> by opening the kick panel vents, so it is not really necessary.  If you
>>> have
>>> a "fresh air heater" and the air coming out of the floor vents is 
>>> too hot
>>> when you use the "heat" control (and it will be, if all your hoses,
>>> thermostats, etc. are working properly!), just open the kick panel 
>>> vent a
>>> bit and you will get a nice mix of air (except on hot days of 
>>> course, but
>>> then why would you be using your heater?)
>>>
>>> Bill Hubbell
>>>
>>> -----Original Message-----
>>> From: virtualvairs-bounces at corvair.org
>>> [mailto:virtualvairs-bounces at corvair.org] On Behalf Of Kent Duncan
>>> Sent: Tuesday, September 18, 2007 12:14 PM
>>> To: virtualvairs at corvair.org
>>> Subject: <VV> '61 Fresh Air Plenum
>>>
>>> The fresh air plenum on the engine shroud of my '61
>>> Monza is equipped (?) with an apparently "factory"
>>> block off plate.  While I've got things apart, is
>>> there any reason not to remove that plate and add the
>>> necessary hose between the engine shroud and heater
>>> plenum?  Will this change alone give me "fresh air"
>>> capabilities for the interior?  Is this a factory
>>> delete of some kind, and if so, why would anyone
>>> choose it?
>>>
>>> Thanks--what a great source of advice this forum is!
>>>
>>> Kent Duncan
>>> '66 Monza
>>> '61 Monza
>>>
>>>
>>>
>>>
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