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What the heck is the gap on plugs????

This is a discussion on What the heck is the gap on plugs???? within the General Help forums, part of the LSx Technical Help Section category; Did search after search and found 100 different answers. I have NGK TR 55's ready to go in the car ...

  1. #1
    I don't sell out! blackSS01's Avatar
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    What the heck is the gap on plugs????

    Did search after search and found 100 different answers. I have NGK TR 55's ready to go in the car and need to know what gap. Out of the boxes they are at .055. I have seen .052 all the way to .060...... WHICH IS IT???? Help would be appreciated.
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    Moderator Firebirdjones's Avatar
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    I've had my gap tightened up for so long I really don't remember the factory gap.
    But from what you are finding, there really isn't much difference. I would personally tighten it up a bit and leave it be.

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    the factory ones are .40 and i believe the NGK TR 55's are at .055 to .060 some people just drop them in out of the box with out a problem.

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    Single Malt rbob93's Avatar
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    Stock platinum tips were .060
    New iridiums should be gapped @ .040
    TR 55's will have no problem @ .052 to .055 & I have seen them run as tight as .032

    Our systems were designed to fire a large gap

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    3-Time F-Body Offender doozjamann's Avatar
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    Look in the owners manual. It's in there.

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    Moderator Firebirdjones's Avatar
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    I checked mine. I gap them at .035

    No need to open them much larger than that, just makes the ignition system work harder to jump the gap, not to mention the electrodes will wear over time and the gap will increase as a result.

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    I don't sell out! blackSS01's Avatar
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    Thanks for the replies. They are all .054/.055 out the box so I am just going to drop them in.

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    Retired NOT tired SteveC's Avatar
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    Quote Originally Posted by rbob93 View Post
    Stock platinum tips were .060
    New iridiums should be gapped @ .040
    TR 55's will have no problem @ .052 to .055 & I have seen them run as tight as .032

    Our systems were designed to fire a large gap
    Bingo, right on the money, and you can not gap the iridiums without damaging them, they come pre gapped from the manufacturer.

    I have my TR55 @ .055

    SteveC

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