408 cooling issues

Heating / Cooling / AC

  1. superchargeddrt

    superchargeddrt Well-Known Member

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    Yep,
    I didn't seal the scoop to the throttle body. I had it sealed when I had the supercharged engine but haven't gotten around to sealing it on this one. The engine is coming out this weekend (for the 3rd time) to fix a reoccurring main seal leak, maybe I'll just address it then.
     
  2. famous bob

    famous bob mopar misfit

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    I feel ur pain , I have a rear main leak , but goiung to wait till winter, so I`ll have something to do. I hate being cooped up in cold weather .
     
  3. superchargeddrt

    superchargeddrt Well-Known Member

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    Yeah this has GOT to stop. 3rd time since I put in the new engine. I only have 700 miles on it. I bought one of the Wagner dual flow PCV valves. According to their testing it keeps the crankcase under vacuum 99% of the time. It's expensive $129.00 but if it saves me from ever replacing another rear main seal then I'm in. Here's the link in case you're interested.

    Dual Flow Adjustable PCV Valve – M/E Wagner Performance Products
     
  4. yellow rose

    yellow rose Overnight Sensation

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    Wow. I thought you had that leak licked. What a bummer.

    I think I mentioned in another thread about how to fit the rear main seal so it doesn't have too much crush. When you take yours apart, are you going to look at how much crush is on that seal? I'd like to see.


    Sorry for the thread hijack.
     
  5. superchargeddrt

    superchargeddrt Well-Known Member

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    Yeah it was good until I took it on its first highway drive to Carlisle. I got about 100 miles out and I started noticing smoke coming out from under my car. Now I tried to reason to myself that the smoke was actually coming from my buddy Larry's '64 Barracuda (because I was following him and it does smoke) but no such luck, I passed Larry had them look and sure enough it was coming from under my car (not out of the exhaust). The first thing I thought was the connectors at my remote oil filter adapter were leaking but when we pulled over and looked it was coming from the center of the engine and leaking bad enough that I had it flat bedded 100 miles back home. I will take pictures of the seal. Do you have a link to your thread on how to fit the seal? I'll keep you posted. Sorry as well for hijacking the thread. We can move this conversation to the tread I started for it.

    Well It Leaks AGAIN!
     
  6. famous bob

    famous bob mopar misfit

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    I used to never have rear main seal problems on my two hemi`s, they were the hard side seal types. I am going to use those again next time ------????
     
  7. sport74

    sport74 Well-Known Member

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    So an unsealed hood scoop allowing fresh air into the engine bay adds heat? I'm confused
     
  8. famous bob

    famous bob mopar misfit

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    Will pressurize the engine compartment out on the hi way, the air pressure in there will fight incoming air thru the rad. .
    Some people may get by w/ it , guess it depends on how much engine heat and rad. u have too .
    I have never seen one that didn't at least benefit cooling , that is sealed .
     
  9. BrianT

    BrianT Let's go!

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    I've heard that also and it might be part of my problem. I'd like to make a pan that seals the carb to the scoop and see what happens.
     
  10. famous bob

    famous bob mopar misfit

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    ress
    IMG_0474 (1).JPG
     
    • Thanks! Thanks! x 1
    • sport74

      sport74 Well-Known Member

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      That's more than likely the source of the problem. It didn't seem to run that hot with the carb... After going to fuel injection, I cut the hole in the hood for the scoop. That'll be the first thing I try.
       
    • krazykuda

      krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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    • superchargeddrt

      superchargeddrt Well-Known Member

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      I had it done when I had the supercharger but now that it's NA I have to redo it.
       
    • superchargeddrt

      superchargeddrt Well-Known Member

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      Ok so this was what we came up with for sealing the hood to the carb/ throttle body when I had the supercharged engine. Just have to change the height of the foam under the scoop. 0_IMG_20160617_171915129-2672x2004.jpg
       
      Last edited: Aug 17, 2019
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      • superchargeddrt

        superchargeddrt Well-Known Member

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      • mopardude318

        mopardude318 Well-Known Member

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        do you have any more pics of that ? id like to see how you made that.
         
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        • superchargeddrt

          superchargeddrt Well-Known Member

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          I will look.
           
        • famous bob

          famous bob mopar misfit

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          Cookie sheet ?
           
        • superchargeddrt

          superchargeddrt Well-Known Member

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          No it was actually a 1/8" piece of steel.. It had to be stiff enough to not flex when the foam pushed on it. We tack welded a air cleaner base to the plate, painted the plate black and used chrome door edge guard on the edge to dress it up. Make the edge guard on the long side as it will shrink after it heats up.
           
        • supertruck

          supertruck Retired Old Fart stock car racer FABO Gold Member

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          Check out Demon 408's post on the kit he made for his carb to hood seal. Just finished mine and it's great. Search for "N96 One-of-None 1972 Demon Fresh-Air Hood".
           
        • sport74

          sport74 Well-Known Member

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          So I finally got my issue resolved. The fan controller is flaking out.... I went with a cheaper one instead of the Dakota digital one that was highly recommended. It doesn't turn the single fan on anymore, however when I give the A/C signal and both fans turn on, if you remove the A/C signal the second fan turns off but the primary fan will stay on. I will be replacing it with a dual relay: primary controlled by the Fitech and secondary controlled by the A/C signal. Thanks for all the advice and help!
           
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