Can spark plugs be on too tight?

Posted by S_Ranger, Apr 29, 2005
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum. Probationary Members must limit their tech posts to this forum and sub-forums.

  1. S_Ranger

    S_Ranger Banned Member

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    How tight should I have them on, I've tightened them so they can't turn no more, is that too tight? Will it affect performance?
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  2. MyBlack94GST

    MyBlack94GST Proven Member

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    That's always a bad idea - it's pretty easy to strip the threads in your aluminum head. You should never put strength into tightening a spark plug.
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  3. cuttheduck

    cuttheduck Proven Member

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    Amen, use a torque wrench. Otherwise serious headaches result.
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  4. DSMcamaro

    DSMcamaro Proven Member

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    yea, not too tight or you'll never get them off next time you wanna change them ( might stripe the threads in the head). never hurts to use some anti-sieze on the plugs either(especially with aluminum heads).
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  5. FORMONTOYA

    FORMONTOYA DSM Wiseman

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    you don't really need a torque wrench. however, you don't have to twist them on as tight as a head bolt either.

    jim
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  6. JPGRL

    JPGRL Proven Member

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    I heard you should get them seated, then turn 1/2 turn more. (But I use a torque wrench to be sure.)
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  7. psychlow

    psychlow Proven Member

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    Spark plugs should never be tightened that tight.

    Aluminum heads are very easy to strip. If you strip the spark plug sockets, you'll probably be pulling the head to replace the threads.
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