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Thread: spark plug heat range
          
   
   

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  1. #1
    383 chev's Avatar
    383 chev is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 93 tbird sc, daily atm
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    spark plug heat range

     



    What does the heat range of a spark plug mean any way?
    Cause what i have is a spark knock problem that I have only encountered this season. So here is what i did to get it. Last season i pulled to a stop light and the engine stalled HMM. wtf. got it started off i go next stop light same thing HMM. wtf. so I find the culprit (spell check) on of my air/fuel screws kept backing out making it run to rich which is what it was always doing anyway.
    So i find some rubber hose that fit the screws and into the hole of the float bowl (holley carb). I have finally got it running some what right no more fuel smell anyway plugs running a little white (lean) right? So the only other thing that i have done is change the spark plug. Local parts store didnt have the ngk#7 so I went with r44ts and now i have spark knock. also my dizzy is msd locked and is set at 32 deg. Oh and the only time I get this is when i put my foot int he carb (full throttle).
    12.5 compression with race fuel.
    950 proform carb
    I have already started jetting the carb up in sizes and the spark plugs are getting darker and seems to be running a lot better on the bottom end and even mid range but full throttle spark knock. so my question is would the spark plug make that much of a diff

  2. #2
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
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    To add to Denny's post, Remember that NGK reverse's their numbers. Higher is colder. Lower numbers are hotter. FYI. (Thank's Denny, didn't mean to step on your toes).
    What if the "Hokey Pokey" is what it's really all about?

  3. #3
    383 chev's Avatar
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    so a hotter plug could cause pre ignition

  4. #4
    383 chev's Avatar
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    ok Denny thanks one more question then.
    will this change the air/fuel ratio? i mean have i been barking up the wrong tree here will it run richer with a colder plug.

  5. #5
    383 chev's Avatar
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    they had cork gaskets and they were wore OUT badly so thats what i did i dont know if i like that spring idea Oh thanks for your help Denny

  6. #6
    76GMC1500 is offline CHR Member Visit my Photo Gallery
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    I run a NGK #9 plug in my bike. It will burn a hole in the piston if I run anything hotter.

  7. #7
    nitrowarrior's Avatar
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    Yes, They sell the "corks" by themslves. Usually have to order them but worth the wait. Thanks Denny for bringing up the springs. I forgot about those from the olden days. (not to make any of us any older....)
    What if the "Hokey Pokey" is what it's really all about?

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