Results 1 to 6 of 6

Thread: Charge air temps

  1. #1
    Join Date
    Nov 2003
    Location
    Davenport Florida
    Posts
    268

    Default Charge air temps

    One of the parameters I've been watching on my new to me 07 since I got my Ultragauge working in it has been the charge air temperature. I have noticed when the truck is cool, the charge air is not much above ambient driving around with no load. Once the thermostats open and the rad gets warm the charge air temp goes up, and never gets close to ambient no matter how I drive. The rad is behind the intercooler, so I don't understand how it is absorbing heat with ram and fan air going across it. I see 120- 130 running down the highway, with only 2 psi boost. I took small tubing and flushed out the cool stack and in between as best I could without disassembly. Didnt see much coming out either. Is this temp.rise normal or am I missing a baffle.or.something up.front? It's been in the 70s here and I wouldn't expect the temp to rise that much when the rad warms up.
    email rfkjr@juno.com
    07 2500HD C/C LBZ 248k
    83 K2500 X 6.2, now 390 Stroker,18.5 & 19.5x 44 TSL\'s & Boggers,5.13w/Det.Lkrs. Mud Toy
    90 ISUZU, 350 eng, 350 trans, Double xfer cases, 2.5 Military Axles, Tractor tires

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    A/C or any level of defog (or auto climate control) will shed heat into the stack. The A/C condenser is forward of the CAC.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Nov 2003
    Location
    Davenport Florida
    Posts
    268

    Default

    AC was off, for sure. Havent needed AC lately, and I made sure the compressor wasnt running. Like I said, air temp stayed down till coolant temp got near 180 and the stats opened. I watched it do it a couple times over the weekend.
    email rfkjr@juno.com
    07 2500HD C/C LBZ 248k
    83 K2500 X 6.2, now 390 Stroker,18.5 & 19.5x 44 TSL\'s & Boggers,5.13w/Det.Lkrs. Mud Toy
    90 ISUZU, 350 eng, 350 trans, Double xfer cases, 2.5 Military Axles, Tractor tires

  4. #4
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    What is the temperature differential? Is it linear? The intake plumbing is under-hood, so it wouldn't be unreasonable to assume that engine compartment heat will be transferred to the plumbing. Open thermostats increases engine compartment air temperature, and the thin aluminum pipes will pick up a lot of heat very easily. The air intake inlet will also pick up engine compartment air. The turbo will also transfer exhaust heat from the turbine to the compressor. It's probably several factors causing the rise in charge air temperature. Each may be minimal, but combined may add up to a significant increase.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  5. #5
    Join Date
    Nov 2003
    Location
    Davenport Florida
    Posts
    268

    Default

    I'm sure running the ac will make a big difference. I've never had a pickup with an intercooler before, so I don't know what is a normal differential across the cooler. I sure wasn't expecting to see air temp increase when the rad gets warm . I was hoping someone else had watched air temp
    email rfkjr@juno.com
    07 2500HD C/C LBZ 248k
    83 K2500 X 6.2, now 390 Stroker,18.5 & 19.5x 44 TSL\'s & Boggers,5.13w/Det.Lkrs. Mud Toy
    90 ISUZU, 350 eng, 350 trans, Double xfer cases, 2.5 Military Axles, Tractor tires

  6. #6
    Join Date
    Nov 2003
    Location
    Davenport Florida
    Posts
    268

    Default

    I'm sure running the ac will make a big difference. I've never had a pickup with an intercooler before, so I don't know what is a normal differential across the cooler. I sure wasn't expecting to see air temp increase when the rad gets warm . I was hoping someone else had watched air temp
    email rfkjr@juno.com
    07 2500HD C/C LBZ 248k
    83 K2500 X 6.2, now 390 Stroker,18.5 & 19.5x 44 TSL\'s & Boggers,5.13w/Det.Lkrs. Mud Toy
    90 ISUZU, 350 eng, 350 trans, Double xfer cases, 2.5 Military Axles, Tractor tires

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •