Stock, hotter, or colder spark plugs??
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Stock, hotter, or colder spark plugs??

  1. #1
    Swollen Member Wasted Income's Avatar
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    Default Stock, hotter, or colder spark plugs??

    Ok, so I'm swapping a 6.0L LSx into my Avenger Jet.

    What do you guys think I should run for spark plugs? Stock heat range, hotter than stock, or colder than stock?

    My gut tells me that since the engine will run cooler than a stock application, that I should go with a hotter spark plug....but would that have any effect on durability, as I have been known to run the thing miles on end WFO.

    Thoughts? Concerns?

    Thanks!
    Jeff
    Last edited by Wasted Income; 04-21-2010 at 06:43 AM.
    1975 CeeBee Avenger 18' - 6.0L LSx, 12JG

    2002 Sunsation 288


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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    ngk tr8

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

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    Swollen Member Wasted Income's Avatar
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    Ok, but why?
    1975 CeeBee Avenger 18' - 6.0L LSx, 12JG

    2002 Sunsation 288


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  6. #4
    Senior Member slow67's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    ngk tr8
    Hes not running boost

  7. #5
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by slow67 View Post
    Hes not running boost
    he asked where to start, tr8's are a good in between plug, lil cold yes but they'll last

    Dare to be different, if it turns out great you can claim you planned it that way.

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  8. #6
    Swollen Member Wasted Income's Avatar
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    I am running TR6 plugs with my boosted setup, and they work great.

    But this boat engine will be NA for awhile.
    1975 CeeBee Avenger 18' - 6.0L LSx, 12JG

    2002 Sunsation 288


  9. #7
    Swollen Member Wasted Income's Avatar
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    I guess my question is not LSx specific...but what do any of you guys run for plugs....hotter or colder? Why?
    1975 CeeBee Avenger 18' - 6.0L LSx, 12JG

    2002 Sunsation 288


  10. #8
    mo balls than $cents$ IMPATIENT 1's Avatar
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    i like to start colder than normal and adjust from there, most "stock" plugs will never see the extended rpms we do, and a hot plug really has no place on a nice runnin sbc imo. cold plugs don't mind the excessive cylinder pressures i like to make

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  11. #9
    Senior Member SoldHondaBoughtHondo's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    ngk tr8
    X2 for NGK...i have been playing with motorcycles for the last 15 years and from a 125 cc 2 stroke to a 1400 cc/ 30 lb boost turbo deal, they seem to work the best...
    And your comment about timing on another thread..'locked out @28" My boss drilled that into my head in 1982.......Maybe 30..with a full load of AV.

    I think it's supposed to give a little room for error..that ragety edge thing is for racers...i was in a twin turbo boat years ago that ran it's absolute best, a split second before the motor went 'a little lean' due to a weak fuel pump, it put 4 pistons in the pan in about .1 second flat.

    Does anybody make a stand alone system that monitors EGT/knock/fuel pressure/oil pressure/engine temp, so if something does take a dump it can back the motor down before it hurts parts....gauges are always nice but you can't watch them all the time and electronics will always be faster the people.

    I have one of those BBO motors with the inherent oiling problems. I run a 30lb hobbs switch connected to oil pressure that controls voltage to the coil. It starts off the starter bypass wire but it won't run if it doesn't have
    enough oil pressure..i am just learning how to drive a boat, i have no need to be babysitting an oil pressure gauge.
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

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