Plug reading & recommendations
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Plug reading & recommendations

  1. #1
    Strap on the JATO konajet74's Avatar
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    Default Plug reading & recommendations

    I'm having trouble reading my plugs & wanted to ask you guys
    a couple questions. My Engine's freshly re-built & the 800dp
    Holley 9022 carb re-built w/ a holley kit. I have no problems
    what so ever, no hesitation & the throttle response is perfect.
    My holley has stock jetting, squirters, cam's etc. But I cannot
    get any color on the plugs? I have a Victor Jr. Intake & I put
    Splitfire plugs in it(SF2E), I think that's the #? I know these are
    not setup for a Marine app. Is there another plug that works
    better for reading? How about a NGK BR6FS? I did some searching,
    but couldn't find anything for my setup. Here's my build;

    Chevy 454 .030 9.5/1comp
    990 heads
    Crane Hyd roller 226/236 ZHR-288
    Rewarder OT headers
    Petronix HEI

    Since this is a high rise/ air gap style single plain intake does that
    necesitate more jetting? I thought Holley's were a little rich in stock
    form?

    Thanks Guys in advance!

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    Senior Member ol guy's Avatar
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    Question everyone will ask! OR SHOULD. How much idle time and how much WOT time before checking plugs? (WOT) wide open throttle.

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    Cantard 71hallett's Avatar
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    You need the short reach taper seat plug? Of the top of my head ngk r5673-7
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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  6. #4
    Strap on the JATO konajet74's Avatar
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    Quote Originally Posted by ol guy View Post
    Question everyone will ask! OR SHOULD. How much idle time and how much WOT time before checking plugs? (WOT) wide open throttle.
    There's a long wide open shoot before entering the marina w/ a
    short idle in before docking. I pulled the plugs after & the porcelain
    was white w/ a small spot(1/8")wide or so that was tan at the
    very top. I'm getting no color changing on the threads also, so
    i'm sure I need a hotter plug?

  7. #5
    steelcomp was here
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    First thing to do is learn to read a plug. The NGK's are a good place to start. They're about the easiest plug to read, IMO. Next would be Autolite. I've never tried to read a splitfire, but I'm guessing you can't very well.
    Idling isn't going to help you read plugs. You really need to shut the engine off at WOT with no idling, and you need new plugs to get a true reading. You don't read porcelain color either. Ground strap, electrode, and carbon ring (way down inside the plug) are the three places to read a plug correctly. You need a good lighted inspection scope to do this correctly, and not just a $40.00 cheapo. You also need to know where your timing is.
    HTH
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    gn7
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    Quote Originally Posted by steelcomp View Post
    First thing to do is learn to read a plug. The NGK's are a good place to start. They're about the easiest plug to read, IMO. Next would be Autolite. I've never tried to read a splitfire, but I'm guessing you can't very well.
    Idling isn't going to help you read plugs. You really need to shut the engine off at WOT with no idling, and you need new plugs to get a true reading. You don't read porcelain color either. Ground strap, electrode, and carbon ring (way down inside the plug) are the three places to read a plug correctly. You need a good lighted inspection scope to do this correctly, and not just a $40.00 cheapo. You also need to know where your timing is.
    HTH

    Steelcomp is 100% spot on here. Not only is it totally impossible to teach someone how to read a plug verbally, it is even more impossible to read a plug for jetting, timing, or heat range by having them describe the plug to you. Also, unleaded fuel and more so, gas/ethanol don't leave a very obvious carbon ring compared to leaded fuel, and seem to take longer to color. These sites have some very usefull info and I highly recommend that you read them. http://members.uia.net/pkelley2/sparkplugreading.html
    http://www.4secondsflat.com/Spark_plug_reading.html



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  9. #7
    Strap on the JATO konajet74's Avatar
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    Thanks Guys! I appreciate the help. I think I might go
    buy a wide band O2 setup after I figure this out &
    learn both ways. I'm just making sure I don't hurt the
    motor this early. I'm thinking the jetting is close because
    I have no driveability issues, but the no color on the plugs
    has me a little nervous. I've been going 2jets up at a time to get some color. Does a Victor Jr usually lean the A/F out from a stock
    jetted carb?

  10. #8
    Senior Member Factory1's Avatar
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    FYI, going up two jets at a time may not always be going up at all. Holley does lots of neat things including overlapping jet sizes. Not all, but quite a few. For example, jet #'s 80, 81 and 82 are all .093. 88, 89 and 90 are all .104. There are several more sizes that do this as well. This information can be found in the back pages of most Holley carb books.

  11. #9
    Bouncing off rocks TryMe's Avatar
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    holley sizes jets on flow, not on hole diameter. go by jet number, not hole size when using holley jets

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    Senior Member wagspe208's Avatar
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    Quote Originally Posted by steelcomp View Post
    You really need to shut the engine off at WOT with no idling, and you need new plugs to get a true reading. You don't read porcelain color either. Ground strap, electrode, and carbon ring (way down inside the plug) are the three places to read a plug correctly. You need a good lighted inspection scope to do this correctly, and not just a $40.00 cheapo. You also need to know where your timing is.
    HTH
    He has a jet boat...cannot shut it off at WOT without getting wet.
    (just kidding...had to get a shot in)
    I am with Comp...tellling someone how to read plugs is like telling someone how to screw. Not very easy. Pictures will help, better yet, find someone to spend 10 minutes with you, explain why and how, look at plugs, and go for it.
    Wags

  13. #11
    Senior Member Factory1's Avatar
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    You know what I like about these boards? Damn near everytime I post something, I learn something in return. It's a great place to further ones education.

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    steelcomp was here
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    Quote Originally Posted by TryMe View Post
    holley sizes jets on flow, not on hole diameter. go by jet number, not hole size when using holley jets
    +1
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  15. #13
    B1 Racing cs19's Avatar
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    what does a yellow tint on the porcelain mean? I read somewhere that it can be lead deposits.
    B1Racing.net

  16. #14
    steelcomp was here
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    Quote Originally Posted by cs19 View Post
    what does a yellow tint on the porcelain mean? I read somewhere that it can be lead deposits.
    Or one of your Gold Cup buddies has been pissing in your tank again.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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