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Thread: Warm Air Intake

  1. #1
    Senior Member fifteenwindow's Avatar
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    Warm Air Intake

    Last week I installed a crude WAI. Its a double-walled section of 4 inch dryer duct, wrapped in the reflective backing from a piece of duct insulation. It runs from the intake snout to the radiator.

    I tried running it back to the exhaust manifold at the rear of the engine, but I didn't have a long enough piece of ducting to get that far.

    With the wai running to the radiator, I don't see any intake air heat until the coolant temps reach 195 F and the thermostat opens. This weekend I was driving in 13 degrees F, and my intake air temps stayed at 90 F traveling at 60mph.





    I plan to insulate the rest of the intake snout and airbox when I find more material.


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    Last edited by fifteenwindow; 03-06-2014 at 02:07 AM.

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        click to view fuel log View my fuel log 2014 Mirage DE 1.2 manual: 53.1 mpg (US) ... 22.6 km/L ... 4.4 L/100 km ... 63.8 mpg (Imp)


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    3dplane (12-10-2013)

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    good job, how does that snorkle appear to be attached to the air box?

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    Administrator Daox's Avatar
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    Looks interesting. You'll have to let us know if you notice any benefit from it.

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        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 49.0 mpg (US) ... 20.8 km/L ... 4.8 L/100 km ... 58.8 mpg (Imp)


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    Mitsubishi Technician live4redline's Avatar
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    Edit.... This will be just for sub-temperature conditions right?

    For a more permanent fixture you could always use a water to air "intercooler" with the water routed from the throttle body and back as its one of your better sources of early heat.
    Last edited by live4redline; 12-10-2013 at 06:49 PM.
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    Senior Member fifteenwindow's Avatar
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    how does that snorkle appear to be attached to the air box?
    I didn't remove it so I'm not certain, but it seems to be clipped on, with a sleeve going into the airbox, and its attached to the (resonator?) box behind it, which is bolted on.
    Last edited by fifteenwindow; 12-18-2013 at 12:57 PM.

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        click to view fuel log View my fuel log 2014 Mirage DE 1.2 manual: 53.1 mpg (US) ... 22.6 km/L ... 4.4 L/100 km ... 63.8 mpg (Imp)


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    Senior Member zefke's Avatar
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    Nice installation, but what is the benefit from having warm air coming into your air inlet?

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        click to view fuel log View my fuel log 2013 Spacestar Invite 1.0 manual: 49.3 mpg (US) ... 20.9 km/L ... 4.8 L/100 km ... 59.2 mpg (Imp)


  8. #7
    Carmageddon m4v3r1ck's Avatar
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    Warm air intake is known to burn easier than cold air. So if the air that getting into your engine is already warm, it will burn faster and better which may also reduce the fuel consumption.
    There's also aftermarket warm air intake with heating elements.

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        click to view fuel log View my fuel log 2013 Mirage 1.0 manual: 47.5 mpg (US) ... 20.2 km/L ... 5.0 L/100 km ... 57.0 mpg (Imp)


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    Senior Member fifteenwindow's Avatar
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    And here's more on the idea behind a WAI, via Wikipedia:

    Warmer air is less dense, and thus contains less oxygen to burn fuel in. The car's ECU compensates by opening the throttle wider to admit more air. This, in turn, decreases the resistance the engine must overcome to suck air in. The net effect is for the engine to intake the same amount of oxygen (and thus burn the same amount of fuel, producing the same power) but with less pumping losses, allowing for a gain in fuel economy, at the expense of top-end power.

    See it here: http://en.wikipedia.org/wiki/Warm_air_intake

    ecomodder.com and gassavers.org have more discussions on this topic.

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        click to view fuel log View my fuel log 2014 Mirage DE 1.2 manual: 53.1 mpg (US) ... 22.6 km/L ... 4.4 L/100 km ... 63.8 mpg (Imp)


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    Senior Member zefke's Avatar
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    COOL Can you measure the difference when you install the WAI like you did?

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        click to view fuel log View my fuel log 2013 Spacestar Invite 1.0 manual: 49.3 mpg (US) ... 20.9 km/L ... 4.8 L/100 km ... 59.2 mpg (Imp)


  11. #10
    Senior Member fifteenwindow's Avatar
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    Yes, you can run fuel mileage tests by driving the same route with the wai installed, and then without the wai. Try to eliminate as many variables as you can (different temperatures, traffic, wind speed/direction, weight of your carload, etc.) as these will affect your mpg. Multiple tests will yield more valuable results than a single test.


        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage DE 1.2 manual: 53.1 mpg (US) ... 22.6 km/L ... 4.4 L/100 km ... 63.8 mpg (Imp)


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