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Thread: Too much cold air??

  1. #1
    VCVC Member lvjjj's Avatar
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    Too much cold air??

    Kinda feel a little guilty asking questions about my Suburban on VCVC, but the van is stored next door, runs great and doesn't need anything right now. So I have to have something to work on.

    As some may know, we use the '94 K1500 GMC Suburban with a 350 to tow our travel trailer. For some time I've had two cold air intakes. First replaced the original 3" "muffler" box intake with a straight 4" dryer pipe. Then cut another hole in the other side of the air cleaner same size as the original and ran 4" dryer pipe to the driver's side fender, cut a hole in the inner fender to get colder air.

    Lately, it wasn't running too good so thought maybe it was getting too much air, so closed off the extra intake port. Turns out it was a bad EGR valve, replaced it runs much better. Now I'm wondering if it will make any power difference when towing to re-install the 2nd intake pipe???????

    btw-when I first bought the Burb it wouldn't go over 65 mph, and hardly would tow. Its finally got a lot of power after replacing plugs, wires, cap & rotor with AC Delco parts, adding MSD adjustable timing control to run 15* advance, installing dual exhaust, replacing K&N air filter with stock one, replacing cracked exhaust manifolds with new ones, and other stuff I can't remember right now.
    LARRY OF THE PACIFIC NW
    1965, 292, TH350
    purchased Nov. 22, 1970

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    VCVC Member kookykrispy's Avatar
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    The engine is essentially a giant air pump. Its only going to flow as much as as the "pump" is capable of moving. Removing any restriction in the intake tract is a good idea and there are gains to be had in this regard, but eventually, you reach a point of diminishing returns where it already is getting all the air it can use, and making more air available is not going to do anything. Since that stock engine makes maybe 200hp max, then adding an additional 4" tube is likely not going to do much.
    Last edited by kookykrispy; 04-26-2019 at 07:35 AM.



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    VCVC Member Wookee's Avatar
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    Cool

    The computer will only allow the system to work as good as it is programed to do.
    Unlike the older carb equipped engines where more fresh air can make a difference.
    Its a "van thing". A life style you have to live to understand!!!!

  4. #4
    VCVC Member lvjjj's Avatar
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    Thanks guys. Makes sense. When I got rid of the very restrictive "muffler" box that reduced the intake to 3", it made a huge difference. Didn't notice much or any improvement when i added the second intake pipe.
    LARRY OF THE PACIFIC NW
    1965, 292, TH350
    purchased Nov. 22, 1970

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