Spark Plug reading 101
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Spark Plug reading 101

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    Senior Member cave's Avatar
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    Default Spark Plug reading 101

    This is a photo of my number 2 plug. I was told to take the readings from the front of the engine since the front gets the cooler water and the back gets the hotter water
    What do you all think? Too rich? Just right? The base of the center electro is a bit darker than what is shown.
    Takin it home

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    First of all Put the right spark plug in your engine for your application.
    Looks like your running a Platinum plug or something for an electronic fuel injected car. does not work with a carb in a boat. Put a proper plug in, and it will quit fowling it.Then you can tune your motor.

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    Quote Originally Posted by blownjet13 View Post
    First of all Put the right spark plug in your engine for your application.
    Looks like your running a Platinum plug or something for an electronic fuel injected car. does not work with a carb in a boat. Put a proper plug in, and it will quit fowling it.Then you can tune your motor.
    x2- unless its honda powered.
    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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    Senior Member cave's Avatar
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    The Plug is a AC Delco #4 Marine Plug. I guess that it being SS is what makes it marine.
    NGK's B8ES??? Dam I run those in the Banshee. lol. I'll give em a try this weekend. If I can find the R I'll get those. I cant remember the code but I know they had them in resistor.
    family matters, I haven't addressed that sputter yet. Not sure if I want to just ditch the power jet. Old guy says to get rid of it and I just might.

    These plugs were in the Liberator when I brought her home. But I'll go ahead and change them. AS for WOT thats gunna be tough. No wake zones are all over the place and then changing them on the spot? shit them headers are freaking H.O.T. and darn thick. I better get a spark plug puller.

    Thanks for all the help. I kinda know which way I need to go now.

    Fiat48 Thats a good site but seams to argue with everything else I have read. Some say read the porcelain others say not to. This is what kicks me in the balls.

    Family Matters Whats this EGT you speak of.
    Takin it home

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    The key to that is.....that is reading an NGK plug...not other brands. And that is racing.

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by cave View Post
    This is a photo of my number 2 plug. I was told to take the readings from the front of the engine since the front gets the cooler water and the back gets the hotter water
    What do you all think? Too rich? Just right? The base of the center electro is a bit darker than what is shown.
    IMOP from the looks of that plug you have alot of idle time and no wot time. The white and heat shown on the electrod tells me that the motor is way lean on the top and idleing fat. I don't fnow the set up and how the boat was ran prior to plug pull but I would say thats an o sh$t situation. Cave, I do remember the the site name but not the situation, call back. M

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    Cave What are you running for an engine. do you have almn. heads,what compression, pump gas? looks like a gasket 3/4 reach NGK # would be R-5671A-7 That plug # may or may not be right heat range. Give me more info on engine and I can give you the right #

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    Senior Member cave's Avatar
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    BB Chevy GEN VI 502 bored 30 over. GM Aluminum Performance heads here is a pics.





    I don't have all the specs as I picked up the boat in mid February. I was told that the engine was built low compression for a blower. The pistons are SRP 139482
    Lifters GM171200061. The heads have had a radius blend valve job. Engine was balance with the flywheel. All this from the build sheet from Chucks speed center in Phoenix.

    Ol Guy Yes I do have a lot of idling time on it. The no wakes here are long especially to the back beach. I do get on it between the 2 no wake zones. It turns 5K but I keep it at 43 to 47 k with a 5K rev Limiter chip. It had a 7K chip but I switched it out.

    The boat runs a solid 70 on the lie detector, GPS. 73 tops. I run 50 50 Av Gas / 91. I have run 100% av gas but didn't notice much gains.
    Electrical is all new except the actual MSD Marine distributor. MSD 6AL Box and Blaster coil II. I have the III to as a back up. MSD 8mm Plug wires. AC Delco 4 Spark plugs, yea yea I know get some real ones.

    I don't know what the cam specs are.

    396 (Mike) prolly knows more about it than I do.lol.

    I do know that this Liberator runs great. Its just the sputter at idle that drives me nuts. I'll work on it this week end.

    I appreciate all the info you fellas are throwing my way.
    Takin it home

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    Get rid of those Plugs . Put in a NGK R5671A-7 and run it I can read those plugs even if you idle doesnt matter as long as you make a Wide open pass or two. then bring plug by the shop and I'll look at it. Bet your Idle miss goes away also. Good luck.

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    Senior Member cave's Avatar
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    Good Info. I know 2 strokes and jet mine on the breaking edge but don't want to do that on the boat. I can always get a tow on the Banshee or push it home but I cant push the boat.

    blownjet13 you gunna be at Bartlett on the 17th?

    Family Matters, I don't have all the info on the cam. I just know the boat runs great when I punch it. I just thought that my sputter was either the plugs loading up or the carb dripping. The carb is a Holly DP 4150 850. I haven't pull the bowls yet to check the power valve or the jets.

    Lots of good info here. I'm gunna copy this stuff on my PC. I don't want to loose info like I did at Hot Boat.
    Takin it home

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    Quote Originally Posted by cave View Post
    Good Info. I know 2 strokes and jet mine on the breaking edge but don't want to do that on the boat. I can always get a tow on the Banshee or push it home but I cant push the boat.

    blownjet13 you gunna be at Bartlett on the 17th?

    Family Matters, I don't have all the info on the cam. I just know the boat runs great when I punch it. I just thought that my sputter was either the plugs loading up or the carb dripping. The carb is a Holly DP 4150 850. I haven't pull the bowls yet to check the power valve or the jets.

    Lots of good info here. I'm gunna copy this stuff on my PC. I don't want to loose info like I did at Hot Boat.
    Yes Myself and Flatnutz110 will be there on Sunday telling a few other people about it also. Trying to find time to get my Engine done.

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    Quote Originally Posted by blownjet13 View Post
    Get rid of those Plugs . Put in a NGK R5671A-7 and run it I can read those plugs even if you idle doesnt matter as long as you make a Wide open pass or two. then bring plug by the shop and I'll look at it. Bet your Idle miss goes away also. Good luck.
    I was going to go to the garage this morning and get that #, soon as I saw it I remembered. Jez I hope I am not getting old.
    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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    Quote Originally Posted by cave View Post
    I can always get a tow on the Banshee or push it home but I cant push the boat.
    Did I ever tell you about the time I swam the boat in from the back of Saguaro? Yes, it can be done!

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