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Thread: 318 running hot
          
   
   

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  1. #1
    firebird77clone's Avatar
    firebird77clone is offline CHR Member Visit my Photo Gallery
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    318 running hot

     



    Ok, lots of expensive parts on this motor, but the only pieces worth mention: aluminum heads and intake, roller rockers and under a point-five lift, near te-to one compression, aluminum radiator and electric fan.

    Anything other than timing likely to make it run hot?
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  2. #2
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    Do you have a good shroud on the fan? That's the first guess. Running a T-stat? What fan are you running, brand and rating?
    Roger
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  3. #3
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    Fan pushing or pulling? is radiator sized to engine?
    Charlie
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  4. #4
    firebird77clone's Avatar
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    Summit fan and radiator, fan is pulling, radiator was ordered as a direct fit.

    Feels to be throwing out a ton of heat, so I'm thinking the problem is the motor.
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  5. #5
    1gary is offline Banned Visit my Photo Gallery
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    I agree.A effective shroud is huge.

  6. #6
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    What stat are you running and has the motor been bored out? how much.
    I had that problem years ago with a motor that was bored out.
    I ended up running a water regulater instead of a stat.
    Order them from Summit, 3 differant sizes to a pack,
    which are for running differant temps.
    Kurt

  7. #7
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    Do you have a high flow water pump on it or just a stocker? What size pulley's on the crank and water pump?
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  8. #8
    firebird77clone's Avatar
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    Stock pulleys, bored .60 over. Cant remember if I put an aluminum pump or not
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  9. #9
    1gary is offline Banned Visit my Photo Gallery
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    The thing about those 318's is they are known for being rock solid reliable.There is certainty something going on here.

  10. #10
    t-top havoc is offline CHR Member Visit my Photo Gallery
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    CFM of the fan? What's the temp getting up to?
    Air still in the system, carb way tune off, t-stat faulty.
    Can you see flow in the rad when the t-stat should be open?

  11. #11
    1gary is offline Banned Visit my Photo Gallery
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    When the T-stat opens with the rad cap off,are you seeing a continuous stream of bubbles??.

  12. #12
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    I'll check for flow. Meanwhile, does the 318 have tendency to have air pockets?
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  13. #13
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    I have flow, And bubbles, and the coolant looks like crap, a little dark with dark particles.

    I'm thinking the machine shop did a poor job of cleaning the block
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    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  14. #14
    t-top havoc is offline CHR Member Visit my Photo Gallery
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    Most all engines will have tendency to have air in the sysytem. " Nature of the beast, " so to say.
    Rad cleaned out before the engine put in?
    I've always been told " No matter what the block & heads look like, clean the inner passages with soapy water & lots of flowing water, then do it again til no more grit comes out. " Unfortunately, machine shops don't do this.
    Does the fluid feel gritty? Can you see the grit?
    I personally would take out the t-stat & flush everything til it comes out clean.

  15. #15
    1gary is offline Banned Visit my Photo Gallery
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    Quote Originally Posted by firebird77clone View Post
    I have flow, And bubbles, and the coolant looks like crap, a little dark with dark particles.

    I'm thinking the machine shop did a poor job of cleaning the block

    If it is a steady stream of bubbles and not just bubbles getting the air out,then it is possible it hot one time too often and your seeing the compression escape from a cylinder(s) with a bad head gasket or cracked head.Pull the plugs and take a look see if any show signs of coolant.

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