Plug Read
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Plug Read

  1. #1
    Super Moderator HammerDown's Avatar
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    Question Plug Read

    What does a slight 'fuel ring' at the porcelain top mean?
    Usually I'll see it at the porcelain's base.
    Installed my 850 vc...the engine seems to really like it vs the 850-annular dp that came off.
    Proper secondary spring is in, they start kicking in a 4k and do so smoothly/no stumble
    Still tweaking jetting, may be a hair rich.
    Click image for larger version. 

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    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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  3. #2
    gn7
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    Some guys call it the fog ring. My understanding is its caused by fuel additives.



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    Or Seth, either one Budweiser's Avatar
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    GN7, how does the heat range on that plug look to you?

    I ask because I'm not super proficient at plug reading. From what I've read and understand, it looks like the plugs heat range is too cold.

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    gn7
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    Quote Originally Posted by Budweiser View Post
    GN7, how does the heat range on that plug look to you?

    I ask because I'm not super proficient at plug reading. From what I've read and understand, it looks like the plugs heat range is too cold.
    I am a one of the "hottest plug that doesn't cause pre ignition or burn of the ground electrode kind of guys. I would say its fine. Remember, that thing has some time on it, and I have no way of knowing how the boat was run just prior to taking it out.
    The only thing that jumps out at me is it looks like it might be burning a little oil based off the outer ring.



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    Senior Member EVILFORCE's Avatar
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    Need to see deeper down plug. I like mine a little darker. How long has that plug been running?

  8. #6
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    Need to see deeper down plug. I like mine a little darker. How long has that plug been running?
    AC Delco R43ts
    Those plugs did have some run-time on them, not fresh with a 1/4 mile WOT shut down.
    I was doing for some extended 3,500 to 4k several mile runs to check primary jetting before the secondary's started to open..and trying to avoid some stray rollers from a TUG BOAT had a sloppy shut down.

    Holley 850-VS list-80531 > it comes out of the box with 78-primary & 84-secondaries.
    The plug did have a full-turn of color on the base ring but my thumb accidentally took it off handling it.


    To be safe, at jump I started with 81 primary & 86 Secondaries with 6.5 PV front/rear proved the right choice.
    Thinking I may sneak back down to out of the box jetting, fresh plugs and a few 1/4 wot passes.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member ol guy's Avatar
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    Without knowing the hole set up on that engine, good luck! I really like the silver specks on the plugs. M

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by ol guy View Post
    Without knowing the hole set up on that engine, good luck! I really like the silver specks on the plugs. M
    Yes, and that ground strap looks like it been plenty hot to me. jmo.
    "if we keep doing it the same way we always do..we will always get the same results"
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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by ol guy View Post
    Without knowing the hole set up on that engine, good luck! I really like the silver specks on the plugs. M
    Trust me, those are not silver/aluminum specks, as that's the FIRST think I look for.
    Nothing more then debris from the towel that handled it or something else.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  12. #10
    Senior Member ol guy's Avatar
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    Quote Originally Posted by HammerDown View Post
    Trust me, those are not silver/aluminum specks, as that's the FIRST think I look for.
    Nothing more then debris from the towel that handled it or something else.
    Glad to hear it!!!

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    Senior Member SBS933's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    Need to see deeper down plug. I like mine a little darker. How long has that plug been running?
    Agreed, and Happy Birthday
    Believe Nothing you hear and 1/2 of what you see.

  14. #12
    Senior Member ol guy's Avatar
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    Quote Originally Posted by Hass828 View Post
    Yes, and that ground strap looks like it been plenty hot to me. jmo.
    I well agree! Without knowing inches on the engine! It's a hard call . That engine looks real lean to me! M

  15. #13
    gn7
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    Quote Originally Posted by Hass828 View Post
    Yes, and that ground strap looks like it been plenty hot to me. jmo.
    That's because you weenies like to run cold ass plugs that happy with it they'll idle thru the no wake without fouling.
    AC and Autolites, IMO are a bitch to determine the heat range from the ground strap. Its not cad plated like a NGK, and the plug has too much time on it to use the ground electrode for heat. I had NGKs that came out looking like they were 3 heat ranges to hot, but looked nothing like that on a 2-3 laps of testing, Given enough time at full throttle, and most of the cad is fried off unless the plug is dead ass cold.
    I don't run my plugs that cold. If it doesn't self destruct or glow hot enough to light of the cylinder early, its perfect.

    I will say that if it was me, I would probably toss a couple jet sizes in the secondaries. When you have your foot in it up to your knee cap, its no time to be thinking about fuel milage.



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  16. #14
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by ol guy View Post
    I well agree! Without knowing inches on the engine! It's a hard call . That engine looks real lean to me! M
    Ok, nothing too special but, it's mine
    468 mark-4 mains arp studded
    OE rods reworked with arp studs
    OE cast crank cut .020
    Speed Pro/TRW-L2465F-60 > If I recall with 118cc 049's = 10:1 ???
    049 118cc heads nicely worked over, Crower roller rockers, Jomar stud girdle, larger Ferrea valves, bowl blend, bla,bla,bla and set-up for...
    Lunati Voodoo 60212 roller
    Advertised Duration IN/EX: 282/290
    Duration @ .050 IN/EX: 231/239
    Gross Valve Lift IN/EX: .600"/.600"
    LSA / ICL: 110/106
    Valve Lash IN/EX: Hyd/Hyd

    MSD RTR dizy set @ 32 degrees all in at 2800 > 35 didn't make any more RPM so why go higher, right?

    Weiand Stealth intake now with a Holley 850-VS list-80531 > > > I will say, immediately I noticed the engine has a nicer exhaust note/bite with this 850vs vs the 850 DP list-9380(annular) that just came off.
    HOWEVER, I noticed the 'VS' wants 2-turns out on the idle screws for clean idle/high 13" vacuum reading where as the 850 DB only wanted 1.50 > of course the DP had larger primary jets in it.

    Spinning a 'full' Aggressor-A imp (equal to a berk 2-A) @ 5400 rpm/with baffles in = HP, I don't have the chart (maybe 575?)

    Think that's about it.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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