Odd 426 crate Hemi problem, no heat

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    Author Topic: Odd 426 crate Hemi problem, no heat  (Read 5551 times)

    Offline 734406pk

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #15 on: July 02, 2017 - 02:49:35 PM »
    Quote from: 1 Wild R/T on July 02, 2017 - 01:36:04 PM
    Yeah, but with a 180 thermostat the fan can be blowing all the air it wants, the engine should warm up to 180..... I'd try another thermostat....  :2cents:

    This is true! The engine temp should be regulated by the thermostat. The t-stat should open and close based on its set point, regulating coolant temp to 180 deg in this case. This could be a far fetched idea; but the engine also radiates heat to the atmosphere from it's own surface area, independent from the liquid cooling system. Air flow from a stuck thermo clutch increases the heat rejection to atmosphere to some point, possibly lowering the coolant temp at light load below the thermostat opening set point. I have had this happen on a few vehicles, but they were definitely not Hemi Cudas. Just a crazy idea in the process of elimination. :thinkerg:
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    Offline gyman98

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #16 on: July 02, 2017 - 04:16:42 PM »
    Quote from: 1 Wild R/T on July 02, 2017 - 01:36:04 PM
    Yeah, but with a 180 thermostat the fan can be blowing all the air it wants, the engine should warm up to 180..... I'd try another thermostat....  :2cents:

    I agree,  might be a defective thermostat.  It was a Stant but I suppose even they have QC issues



    Quote from: 734406pk on July 02, 2017 - 02:49:35 PM
    This is true! The engine temp should be regulated by the thermostat. The t-stat should open and close based on its set point, regulating coolant temp to 180 deg in this case. This could be a far fetched idea; but the engine also radiates heat to the atmosphere from it's own surface area, independent from the liquid cooling system. Air flow from a stuck thermo clutch increases the heat rejection to atmosphere to some point, possibly lowering the coolant temp at light load below the thermostat opening set point. I have had this happen on a few vehicles, but they were definitely not Hemi Cudas. Just a crazy idea in the process of elimination. :thinkerg:

    Yes seems unlikely but a cheap,  quick test anyway

    The clutch fan spins free with the engine off but I don't know how to test it other then that
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    Offline 734406pk

    • Andy
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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #17 on: July 02, 2017 - 05:15:04 PM »
    "Yes seems unlikely but a cheap,  quick test anyway"

     :iagree:
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    1973 Challenger 440 6 pack auto 3.91 rear
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    1970 Challenger TA 340 4bbl auto-Sold and sad
    1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
    1995 Kawasaki ZX1100E & still alive

    Offline 73440

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #18 on: July 02, 2017 - 05:20:10 PM »
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    Offline 734406pk

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #19 on: July 02, 2017 - 06:00:50 PM »
    Quote from: 73440 on July 02, 2017 - 05:20:10 PM
    Testing a fan clutch , https://itstillruns.com/test-fan-clutch-5086903.html

    Good article! I tested my OEM fan clutch the same way (440 6 Pack) and found that it was too loose. Changed it out with the Hayden replacement, which felt right but made no difference. 203-205  degrees  all the time, with either fan clutch. It never overheats but that temp makes me nervous...
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    1973 Challenger 440 6 pack auto 3.91 rear
    2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
    1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
    1970 Challenger TA 340 4bbl auto-Sold and sad
    1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
    1995 Kawasaki ZX1100E & still alive

    Offline gyman98

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #20 on: July 02, 2017 - 11:48:14 PM »
    Thanks for the article,  I'll try it tomorrow
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    Offline cudabob496

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #21 on: July 06, 2017 - 08:27:22 PM »
    Quote from: 734406pk on July 02, 2017 - 06:00:50 PM
    Good article! I tested my OEM fan clutch the same way (440 6 Pack) and found that it was too loose. Changed it out with the Hayden replacement, which felt right but made no difference. 203-205  degrees  all the time, with either fan clutch. It never overheats but that temp makes me nervous...

    with alum heads, there is an ideal eng temp for max power, but dont recall what it is. Maybe around 200?
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    Offline brads70

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #22 on: July 06, 2017 - 08:55:47 PM »
    Wow wish I had your problems!  :grinyes:  I'd say as others have too, that your thermostat is not functioning properly!
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    Offline 734406pk

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #23 on: July 07, 2017 - 09:17:35 PM »
    Quote from: cudabob496 on July 06, 2017 - 08:27:22 PM
    with alum heads, there is an ideal eng temp for max power, but dont recall what it is. Maybe around 200?

    195-200 deg sounds good to me in this case. The engine runs nice and smooth in that temp range. 6 packs seem to like the extra heat.
    Logged
    1973 Challenger 440 6 pack auto 3.91 rear
    2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
    1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
    1970 Challenger TA 340 4bbl auto-Sold and sad
    1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
    1995 Kawasaki ZX1100E & still alive

    Offline gyman98

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #24 on: July 08, 2017 - 11:42:07 AM »
    Quote from: brads70 on July 06, 2017 - 08:55:47 PM
    Wow wish I had your problems!  :grinyes:  I'd say as others have too, that your thermostat is not functioning properly!
      I know right,  so weird.  Going to have to try another thermostat



    Quote from: 734406pk on July 07, 2017 - 09:17:35 PM
    195-200 deg sounds good to me in this case. The engine runs nice and smooth in that temp range. 6 packs seem to like the extra heat.

    I will likely stick with a 180° as that's what mopar recommends in their crate hemis
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    1970 hemicuda convertible clone 426/727 3.23 8 3/4 suregrip

    Offline gyman98

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    Re: Odd 426 crate Hemi problem, no heat
    « Reply #25 on: July 22, 2017 - 01:23:12 PM »
    Well tried another 180° thermostat still only getting a Max of 160° On the highway
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