Heating up on highway ?? 72 SSP 440

Heating, Cooling & AC

  1. jprather

    jprather FBBO Gold Member FBBO Gold Member

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    so.. just hit the 500 mile mark on the new 440. runs great, runs cool(195 )around town,on open road if i run 60 mph or over for 10- 15 miles, then heats up to - 205 - 207 area. doesnt matter if ac is on or not, can back it down to 2700/2800 rpms and it drops back to 195. at 60 mph shows 3100 rpms, everything in new, including 26" 3 core radiator,fan shroud in in place, new fan clutch etc.... is this normal ?? anything I can do to help cool engine for highway driving ? I added some wetter water, no difference.
    I have 3:55 gears, which are not ideal for highway, but great for around town and launches.

    any thoughts ?
     
  2. Dibbons

    Dibbons Well-Known Member

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    Do you run Torqueflite or standard transmission?
     
  3. jprather

    jprather FBBO Gold Member FBBO Gold Member

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    727

    thinking about adding an overdrive unit.. just gotta save up some $$$
     
  4. Dibbons

    Dibbons Well-Known Member

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    Maybe the torque convertor is adding a little heat as the RPM's rise on the highway-just a wild guess.
     
  5. jprather

    jprather FBBO Gold Member FBBO Gold Member

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    never thought of that , not sure of stall speed, i know its not the stock one, I just dont remember what i put in it , thinking 2200 +/-
     
  6. black64

    black64 FBBO Gold Member FBBO Gold Member

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    Does your lower hose have a spring in it to prevent collapsing from suction side of pump which creates less flow? Might also be fan clutch disengaging at that speed and less airflow because of it.
     
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    • jprather

      jprather FBBO Gold Member FBBO Gold Member

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      will check to see !
       
    • Johnpat

      Johnpat Well-Known Member

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      What's total timing at 3000,timing can cause this
      problem at those continuous RPMs
       
    • moes

      moes Well-Known Member

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      yes check for a collapsing lower hose. Usually on the highway it heats up is because of poor air flow through the radiator. How far is your fan into the fan shroud, it should be half in the shroud half out. If it is to close to the rad it will block the air flow.
       
    • jprather

      jprather FBBO Gold Member FBBO Gold Member

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      i think the timing is off a little, thinking distributor may need to be re-curved, I get a little valve ping over 3000 under acceleration
       
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      • Frank Mopar

        Frank Mopar Well-Known Member

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        Lean engines run hot.
         
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        • HEMI-ITIS

          HEMI-ITIS STREETER on LI FBBO Gold Member

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          Could be lean........double check timing.
           
        • jprather

          jprather FBBO Gold Member FBBO Gold Member

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          its def not lean
           
        • Dibbons

          Dibbons Well-Known Member

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          Have you checked the color of the spark plug tips?
           
        • YY1

          YY1 Well-Known Member

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          I'd back the distributor down to get rid of the ping then test on the highway

          ...if you can still afford it :)

          Do you have a clutch fan?
           
        • jprather

          jprather FBBO Gold Member FBBO Gold Member

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          yes, I have a clutch fan, still trying to find a balnce on the dist. timing,, hard to start or more power
           
        • jprather

          jprather FBBO Gold Member FBBO Gold Member

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          I checked the lower hose. no spring, so will start there
           
        • brian6pac

          brian6pac Well-Known Member

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          Check your rad cap, if it has good pressure the hose should not collapse, then as said timing, lean fuel, ad a auxiliary trans cooler. Fan clutch shouldn't make any difference at speed.
           
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          • jprather

            jprather FBBO Gold Member FBBO Gold Member

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            i already have an aux trans cooler on it, good pressure at cap
             
          • brian6pac

            brian6pac Well-Known Member

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            How do you know it's rich cruising at speed, I bet it's lean. What carb is on it?
             
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