Cold air intake from the cabin

[jetfuel]

...you horse thief..you need to show the gang some, not all, of your home made stuff, which I believe is top shelf....tag...you're it..

jetfuel

[gbryers]

Originally Posted by Smart Enuf

The noise and other issues aside, in the summer you're going to cool your cabin air anyway with your A/C, so why couldn't you use that cooler air rather than the outside air?

Smart Enuf - as stated, there are several problems with using the cabin air over outside air:
1. In order to prevent yourself from driving in a vacuum, you would need to either draw hot air through the A/C, rather than re-circ, which make the A/C far less efficient, or you would need to keep a window cracked open, drawing hot air into the car;
2. Regardless of how the air gets into the cabin to replace what goes through the engine, the added flow will cause the A/C (which is driven by a thermostat) to have to work harder to cool the air, thus causing a heavier drag on the engine, thus causing the engine to work harder, thus reducing your MPG and available power more...

In the long run, the cool air from inside your cabin will cause you to spend more than the hot air already available outside...

[Jared]

If your engine has something like an EGR (exhaust gas recirculator) or CCV (crankcase ventilation) valves, some vapors may travel back thru the intake when the car is parked after driving. Not a good idea for the interior.

[ciscocali]

The inside cabin air is pretty stagnant compared to the air coming in from the side scoop. The objective is to push in as much fresh air into the engine. In order to do this from the inside cabin, you would need some sort of a blower to blow air into the engine. The blower from the A/c unit does not have enough CFM to properly supply air into the engine.

[Smart Enuf]

Originally Posted by ciscocali

The inside cabin air is pretty stagnant compared to the air coming in from the side scoop. The objective is to push in as much fresh air into the engine. In order to do this from the inside cabin, you would need some sort of a blower to blow air into the engine. The blower from the A/c unit does not have enough CFM to properly supply air into the engine.

Ding, ding, ding, ding. Finally, a simple answer that makes sense from a purely mechanical standpoint. Thanks to you and all the others for your responses. I wasn't planning on trying this; just curious.

[John_H]

Originally Posted by donnyonee

[I] think that CO1 would give the pleasant gray tones and not the pinks as discribed.

CO binds where oxygen would in hemoglobin but doesn't cycle out like oxygen does, displacing the capacity to shuttle oxygen around your body. The rosy complexion comes from the blood not turning blue as you slowly lose your ability to breathe oxygen. Eventually that may turn to pale gray but it takes a while for that red, red blood to finally lose its CO and turn blue, if at all; once you've reached the great beyond, however, your body's not going to consume much oxygen. The mortuary will happily replace it - whatever color - with the proper shade of embalm.

[jetfuel]

...what's the CFM requirement for the smart Eng?...to get an answer we need the following data..
...cc=61cc...
...VE= ?
...red line RPM = 6400
..giving the stock engine a 70% VE the CFM can get to 90 to 115CFM which is not to hard to achieve...just me...(leaf blower supercharger) lol

jetfuel

[donnyonee]

Originally Posted by John_H

CO binds where oxygen would in hemoglobin but doesn't cycle out like oxygen does, displacing the capacity to shuttle oxygen around your body. The rosy complexion comes from the blood not turning blue as you slowly lose your ability to breathe oxygen. Eventually that may turn to pale gray but it takes a while for that red, red blood to finally lose its CO and turn blue, if at all; once you've reached the great beyond, however, your body's not going to consume much oxygen. The mortuary will happily replace it - whatever color - with the proper shade of embalm.

i didnt know that. but now i do.

[Godfather]

Whoever volunteers to try this, keep your Depends handy, for the inevitable backfire..... lol.

[SubSlr88]

Originally Posted by jetfuel

...what's the CFM requirement for the smart Eng?...to get an answer we need the following data..
...cc=61cc...
...VE= ?
...red line RPM = 6400
..giving the stock engine a 70% VE the CFM can get to 90 to 115CFM which is not to hard to achieve...just me...(leaf blower supercharger) lol
jetfuel

In other words, the engine is going to take in a lot more cabin air then the A/C is going to be able to efficiently cool! Once whatever cool cabin air is used up (maybe 10 seconds worth) then the A/C will be running all the time and you'll have suction on the cabin, drawing all kinds of nasty stuff in, AND it'll no longer be cool since it will be rapidly sucking in outside air for the engine.
Better to leave well enuff alone and let the engine get it's air from where it was designed. . .
My two cents - if anyone tries this "suggestion" please be sure and post your results~!