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Old 11-07-2014, 07:35 PM   #1 (permalink)
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Warm Air Intake Idea

I have an idea here. Not sure I will try it, just curious. Has anyone thought about putting something like a heater core in the air box and splicing it into the coolant system?

I know its more complicated than just running a pipe behind the radiator, but maybe you could get hotter air. Or would the air get too hot coming off the coolant? Maybe someone with a better understanding than me could chime in.

Like I said, just an idea. Maybe if it sounds like a good one I'll give it a try.


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Old 11-07-2014, 08:56 PM   #2 (permalink)
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At least one member here has done it. I've considered it, but need to find a heater core that is small enough to fit in my airbox.

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Old 11-07-2014, 09:37 PM   #3 (permalink)
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I also installed a heat exchanger I had in the airbox. It was tight but I shoe horned it in with a couple of notches in each side. it was 1" thick and just the size of the rectangular filter element. I installed it jsut below the filter. I had to reroute the intake to the lower corner which was better and allowed the air to flow the max distance over the exchanger. I covered the airbox inside with some real aluminum duct tape also. The tube was 4 passes and 1/4''. I ran 3/8 ID hose from the heater core return line. I used 2 manual ball valves to control the flow and experiment. I can run full bypass, allow full flow to the airbox or partial flow also. I was gong to install a 4 way valve that I could control from in the cabin, but I found this wasn't needed. With the airbox loop wide open and the bypass half opened the exchanger will raise the AIT about 10 to 11 degrees as measured from one side of the airbox to the other as measured with an IR temp tool.
I hung a cheap pool thermometer in front of the inlet to monitor the under hood input.

BTW, the airbox inlet opening is just a 1.25 ID tube near the lower radiator hose and an additional 5/8" hole between the heat exchanger hose inlets.

Didn't need it much in August except for warmup, but am using it all the time now that outside temps are lower. I have a MAF. I guess the theory is 10% less dense air, then 10% less fuel, less horsepower but the v8 has more than enough for ecodriving. No lugging and have run it up to 90mph with no problems. Hard for me to give any direct FE improvement number. I would guess less than .5 mpg though so far. Winter will be interesting.
Also, before I installed it I measured about a 10 degree differential on the cabin heater supply and return line. If I wanted to lower the supply temp to the airbox I could turn on the heater, lol
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Old 11-07-2014, 10:50 PM   #4 (permalink)
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It is supposed to be 89 tomorrow, but 73 next Sunday.

When would I use a WAI?
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Old 11-07-2014, 11:13 PM   #5 (permalink)
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T vago had a heater core in a Dakota? Air box lid http://ecomodder.com/forum/showthrea...ant-21863.html
But all the pics are down, and I think t vago is on hiatus

I'd go with ecotex's route if I had a suitable valve laying around like he did http://ecomodder.com/forum/showthrea...wai-28033.html
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Old 11-08-2014, 12:59 AM   #6 (permalink)
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There have been a few very slick heater core in air box mods done and pictured on here.

1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
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