Results 1 to 15 of 15

spark plug gap

This is a discussion on spark plug gap within the General Help forums, part of the LSx Technical Help Section category; i am changing spark plugs in my 2000 ls1, the parts store gave me bosch platinum plugs, the gap is ...

  1. #1
    Junior Member lawood's Avatar
    Join Date
    Apr 2008
    Location
    missouri
    Posts
    31

    red
    2000 trans am ws6 ram air

    spark plug gap

    i am changing spark plugs in my 2000 ls1, the parts store gave me bosch platinum plugs, the gap is .040 does anybody know it that would be correct for this plug or should it be closer to .050? thanks

  2. #2
    caraholic ggino85's Avatar
    Join Date
    Jul 2007
    Location
    most miserable city in the US
    Age
    32
    Posts
    568

    blue green chameleon
    1998 Trans Am

    i know the stockers are .060, i just checked the ones that im taking out of my car. the ngktr55's im putting in are at like .057 or .055 depending on how you read the spark plug gap measure thingy im not sure if the bosch's are the same or not.

  3. #3
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    My first recommendation would be to return those Bosch piles of junk.

    Second...pick up NGK TR55's or the Autolite version.

    Third...gap for a stock'ish' LS1 should be .054-.055"

  4. #4
    Junior Member lawood's Avatar
    Join Date
    Apr 2008
    Location
    missouri
    Posts
    31

    red
    2000 trans am ws6 ram air

    Quote Originally Posted by Mr. Luos View Post
    My first recommendation would be to return those Bosch piles of junk.

    Second...pick up NGK TR55's or the Autolite version.

    Third...gap for a stock'ish' LS1 should be .054-.055"
    excellent advice mr. luos, unfortunatly i had to find out the hard way and installed the bosch junk!! they will be coming back out. car is worse than with the wore out factory plugs that had a .075 gap!

  5. #5
    JMAC Racing WS6ICK's Avatar
    Join Date
    Aug 2005
    Location
    Kentucky
    Posts
    535

    2000 Trans Am WS6 LS6
    2006 GTO LS2

    NGK TR55 gapped at .055 FTW!
    2010 Camaro
    2006 GTO, LS2, 1 of 475
    2009 Chevy Silverado


  6. #6
    Retired NOT tired SteveC's Avatar
    Join Date
    Jul 2005
    Location
    Poway, Ca
    Posts
    1,126

    SOM
    2001 Z28 (Sara)

    The above post is correct, the NGK plugs (for NA motor) are gapped @ .055.

    The stock plugs are gapped @ .060 from the factory (if they get it right).

    Keep in mind that the NGK plugs mentioned are COPPER tipped, which means they will only last 30K maximum. I use them on my garage queen (Sara) a 2001 Z28 that has 23K original miles.

    SteveC
    Last edited by SteveC; 08-11-2008 at 06:37 AM.

  7. #7
    Junior Member
    Join Date
    Jun 2008
    Location
    London, UK
    Posts
    18

    Pewter
    2001 Camaro Z28

    Hmm...I'm getting confused now. I thought GM changed their gap recommedation for the LS1 from .06 to .04 some time ago? Something to do with achieving an improved idle? In support of this, I note that NGK list their LS1 plugs (TR55, TR55IX, TR55GP) as having an oe gap of 0.044.

    Could do with having this clarified as I've just ordered a set of new plugs (AC Delco iridium) and want to make sure they are gapped as they should be before installing them.

  8. #8
    Member axxdet's Avatar
    Join Date
    May 2008
    Location
    MI
    Posts
    305

    pewter
    2002 firehawk

    just changed mine with AC Delco iridium gaped at 55 the ones I pulled out were prop stock (only 39k on car) and gaped at closer to 60 and it looked like the tips were wore down a bit making me think thats why the gap was closer to 60....but it starts smoother/idles better

  9. #9
    Senior Member
    Join Date
    Jul 2005
    Location
    Jacksonville, FL
    Posts
    2,725
    GM did change the gap for some reason - I saw the change on NGK's website last year and sent NGK an email. I posted a little about it in this thread: www.ls1.com/forums/showthread.php?t=49408

  10. #10
    Life in the Fast lane sunsetorangess's Avatar
    Join Date
    Aug 2005
    Location
    Bragg NC
    Posts
    2,835

    Met. Sunset Orange
    01 SS

    Heres a little info on why they changed it and what it effected.
    J

    Bulletin No.: 03-06-04-060A

    Date: February 12, 2007

    INFORMATION

    Subject:
    Information on New Spark Plugs and Gapping

    Models:
    2004 Buick Rainier
    2002-2004 Cadillac Escalade, Escalade EXT
    2003-2004 Cadillac Escalade ESV
    2004 Cadillac CTS-V
    1997-2004 Chevrolet Corvette
    1998-2002 Chevrolet Camaro
    1999-2004 Chevrolet Silverado
    2000-2004 Chevrolet Suburban, Tahoe
    2002-2004 Chevrolet Avalanche
    2003-2004 Chevrolet Express, TrailBlazer
    1999-2004 GMC Sierra
    2000-2004 GMC Yukon, Yukon XL
    2001-2004 GMC Yukon Denali, Yukon XL Denali
    2002-2004 GMC Sierra Denali
    2003-2004 GMC Envoy XL
    1998-2002 Pontiac Firebird
    2004 Pontiac GTO
    2003-2004 HUMMER H2

    with 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U - RPOs LR4, LM4, LM7, L59, LS1, L56, LQ9, LQ4)

    Attention: Please disregard the Set Gap Per Vehicle Specification statement on the side of an ACDelco(R) Iridium Spark Plug Box. The statement will be removed from the boxes in the future.

    Supercede:

    This bulletin is being revised to bring attention to the Set Gap Per Vehicle Specification on the ACDelco(R) Iridium Spark Plug Boxes. Please discard Corporate Bulletin Number 03-06-04-060 (Section 06 - Engine/Propulsion System).

    A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed.

    The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01 mm (0.040 in) when the spark plug is made.

    The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. Any new spark plug found to not be properly gapped should not be used.
    2001 SS, Its not the car its the Driver that matters....

  11. #11
    Member axxdet's Avatar
    Join Date
    May 2008
    Location
    MI
    Posts
    305

    pewter
    2002 firehawk

    so .055 is to much?..

  12. #12
    Junior Member lawood's Avatar
    Join Date
    Apr 2008
    Location
    missouri
    Posts
    31

    red
    2000 trans am ws6 ram air

    my tips were completly gone on all plugs and the gap was .075 they were the delco factory plugs i believe

  13. #13
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Location
    Thornton, CO
    Posts
    23,785

    Red Tint Jewelcoat
    2008 Trailblazer SS

    Quote Originally Posted by axxdet View Post
    so .055 is to much?..
    Not for an NGK copper tip plug.

  14. #14
    Junior Member
    Join Date
    Jun 2008
    Location
    London, UK
    Posts
    18

    Pewter
    2001 Camaro Z28

    Well I just pulled out one of the plugs fitted to my 2001 Z28 with 41k miles, to take a look ,and it's an ACDelco 41-985 iridium plug. Looks in very good condition with no apparent tip wear and a healthy light tan colour to it. I haven't got a tool to measure the gap, but it looks to be exactly the same as the new set of 41-985's that I have just received. Laying the plug against a tape measure the gap looks to be dead on 1mm, which I believe is 0.040".

    Given that the 41-985's with the 0.040 gap were only released in 2007 (as per Bulletin No.: 03-06-04-060A) these must be fairly new plugs, so looks like I've wasted my time buying a new set. Guess I should have checked first

  15. #15
    Single Malt rbob93's Avatar
    Join Date
    Aug 2005
    Location
    Ft. Lauderdale, FL
    Age
    69
    Posts
    2,707

    Sebring Silver
    2000 CamaroSS

    Exotic metal plugs center electrode is much smaller requiring lower voltage to fire.
    Our engines were designed for larger gaps due to the lower emissions they produce with our ignition systems. (Our systems can fire the large gap)
    Larger gaps (provided they have sufficient voltage) produce a better chance for more complete burn thus reducing emissions. Because of the more complete burn, they consequently produce more power.
    Exotic metal plugs were designed for applications where plug changes are costly time & consuming.
    They work fine in our systems & reduce plug change intervals.
    The harder metals wear slower than the nickle alloys found in common plugs producing an easy to fire, long wearing plug, that still produces a good burn & low emissions.


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. What kind of oil 5w30& spark plugs&spark plug wire
    By ROMERO98Z28 in forum General Help
    Replies: 20
    Last Post: 09-01-2009, 02:50 PM
  2. Spark Plug Gap
    By slpgto2004 in forum GTO
    Replies: 5
    Last Post: 10-05-2007, 05:58 AM
  3. spark plug
    By SuPeRmAn23 in forum External Engine
    Replies: 27
    Last Post: 08-21-2007, 05:54 AM
  4. Spark plug wire and plug!
    By RYDER661 in forum General Help
    Replies: 2
    Last Post: 03-13-2006, 10:01 PM
  5. NGK Spark Plugs - Combo Deal - MSD 8.5mm Super Conductor Spark Plug Wires, 1998-2002
    By Stealthperf.com in forum Sales and Group Purchases from our Great Sponsors!
    Replies: 1
    Last Post: 01-16-2006, 01:18 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •