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  1. #1
    Rampage's Avatar
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    #7 spark plugs instead of #8?

    Hey guys. Someone told me that it would be better to use number 7 plugs instead of number 8? He said that it would run hotter, which doesn't sound good to me, but he said he always used them. Anyone have input?


  2. #2
    KrunchovXPL-GTX-RX's Avatar
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    By hotter, they mean that the plug will disipate heat through the head at a slower rate. Thus the temp of the plug itself will remain higher during operation than a "colder" plug.

    The theory is that a plug that remains hotter will tend to be more difficult to foul.

    There are those who think it means that the spark of the plug is hotter or more powerful. These worthies should be ignored and left to their re-runs of The Dukes of Hazard.

    I could see running a colder plug in some instances (ie, you are trying to get every last R out of that sucker and you are trying to keep it from eating itself) but I can see no reason to run anything but an 8.

  3. #3

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    Do you think Bo & Luke used a #7 plug on the general lee?

    TLR

  4. #4
    KrunchovXPL-GTX-RX's Avatar
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    I am quite certain that Bo and Luke asked the guy at the parts store for a cam shaft that would "Hit a lick" at idle.

  5. #5
    dghal's Avatar
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    Would Cooter install that for them??

    I agree on the plugs run a 8

    Only time you would ever run a 7 is if say ( It was just idling around the bay with Grandma on it with the wee little kids )

    But you start hammering down and pushing the motor it will hole a piston

  6. #6
    TX21's Avatar
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    Quote Originally Posted by dghal View Post
    \

    Only time you would ever run a 7 is if say ( It was just idling around the bay with Grandma on it with the wee little kids )

    But you start hammering down and pushing the motor it will hole a piston
    True, or if you have a DI motor. They are 7's from the factory.

  7. #7
    Ziggy's Avatar
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    Quote Originally Posted by TX21 View Post
    True, or if you have a DI motor. They are 7's from the factory.
    DI takes an NGK ZFR4F. Is this equivalent to a BR7ES? Huh?

  8. #8
    Ziggy's Avatar
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    Interesting info from NGK website:

    The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. The heat range of a spark plug is the range in which the plug works well thermally. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type.

    http://www.ngksparkplugs.com/tech_su...x.asp?mode=nml

    Memorize this & impress your friends!

  9. #9

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    if he's running a 7 in his DI, maybe that's why he is parting it out

    TLR

  10. #10
    Ziggy's Avatar
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    Quote Originally Posted by TLR View Post
    if he's running a 7 in his DI, maybe that's why he is parting it out

    TLR

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