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Message: <blockquote data-quote="cvkit17" data-source="post: 1064096801" data-attributes="member: 131276">Browsing through forum and found this thread and found it amusing. To do such a thing (direct an engine air intake into the passenger cabin with A/C air is a waste of money and time. Firstly, cold air intake - why is it good for combustion? Because it can contain more oxygen molecules as cold air is denser than hot air. Secondly, properties of air - we know that air consists of O2, CO2, Nitrogen(70%+?, couldnt remember) and some inert gases. But there is situation where the concentrations are out of proportion, say, O2 being less than usual and CO2 is more. Cold air doesnt mean always have more O2..that is why and air cond system for a large and heavy populated space need fresh air intake. Thirdly, A/C air in the passenger space - The air in your car keeps circulating when you switch on your air cond. The air inside the space is blown through a cooling coil and thus we have cold air. The air is being returned to the same fan and passes the cooling coil but at a lower temperature. Small infiltration is sufficient to provide O2 to the driver and passengers. So if you suck air into the engine from your cabin, your A/C will work harder to cool down the "new" air from outside. So...In my humble opinion, it doesnt work, at all. P/S: Although O2 sneaks into our car cabin, it is good to wind down the window for a short while if you are driving long distance. Oxygen keeps our body awake and refreshed. Dinosaurs can be so big because of the high oxygen level in the ancient times <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/rofl.gif"  class="smilie" loading="lazy" alt=":rofl:" title="rofl    :rofl:" data-shortname=":rofl:" /></blockquote>

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