Why would 1 side burn rich?
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Why would 1 side burn rich?

  1. #1
    Senior Member cave's Avatar
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    Default Why would 1 side burn rich?

    Why would 1 side burn rich and the other side lean? I noticed on my transom a thick black soot on the right side and the left side was clean. I have through transome exhaust so its really visible. I pulled the plugs and all the plugs on the left side were lean and the right side plugs were black. 2 850 Holley DP on a 6/71 driven 8% under. I'm jetted 96 primary and 98 secondaries. Running 32° at the dizzy locked out. Burning Av Gas. I was at 94 primary and 96 secondaries. when I noticed the transom, I re jetted up after I saw the transom but it didn't make a difference.

    Pyro was at 1250° at 3500 to 5000 rpms and stayed pretty constant. That was on the lean side, # 1 piston.

    Anyone ever deal with this kind of situation?
    Takin it home

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    What pv's are in the carbs? Have you tried "square" jetting all the way around?

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    Senior Member cave's Avatar
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    PVs are blocked off. I haven't tried to square them.
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    Senior Member Hass828's Avatar
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    Make sure that your intake is snugged up, might be sucking a tiny bit of oil on that side if she's loosened up on ya a little.

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    if it were my set-up, i would put the carbs back to stock (acc pumps, pv's, jets)...IMO u have way too big of jets, they are bordering on alcohol jets!...i would then see how it ran...then, maybe bump them up a bit or square them...also, as was mentioned..ck the manifold for leaks...u should not be haveing that much trouble getting that motor to run rite! ...superchargering is not rocket science & u dont hear of any1 else haveing the kind of trouble ur haveing!!!! ...u need to re-acess the carb issue! or ur not gonna have any fun this summer!...just my .02 cents

    FastRat

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    Quote Originally Posted by cave View Post
    PVs are blocked off. I haven't tried to square them.
    IMO the jets are not to big if the PV's are blocked off. Square jet (on the rich side) and let us know what happens. I think PV's are needed......

    You could always box them up and send them out to Nickerson or someone who can set them up. That way you just bolt on and set the idle.

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    Senior Member cave's Avatar
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    No biggy to go back to where I was last year Ron. I'll give it a few more runs. But so far I'm not impressed with the blown deal. I was faster before. Trouble free. Gas n go. I'm gunna cut the funds off for this deal soon. A few more items will be done then I'm done.

    I don't really know what others have gone through on there 1st go round with a blower set up. I don't know too many that boat like me. Every weekend, both days and some weekdays.

    Jay said he would work em for me and I'll call him Wednesday. Now that the get together is over I have some time for that.

    My old intake and worked Holley 950 DP is just sitting and waiting to get back on..
    Last edited by cave; 03-02-2009 at 07:04 PM.
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    Cave, don't give up on it. Once you get it right, your gonna love it. My motors are ABSOLUTELY turn key. Hit the key and they fire instantly. All I do during the summer is check the oil. IMHO, it would be worth it to have the carbs set up by a professional, for a blower. Also, I would put some boost to that motor. Let the blower do what it's supposed to.I can't tell you what has been done to my carbs ( Merc racing), but I never have issues, ever. Infact, this boat has been one of the most reliable boats I have ever had. You still have time to dial her in before summer.



    Darrell.
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    Cantard 71hallett's Avatar
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    I would be looking past the carbs....once the fuel hits the rotors in the blower the motor doesnt know where its comming from square or not. My.02
    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
    Why would 1 side burn rich and the other side lean? I noticed on my transom a thick black soot on the right side and the left side was clean. I have through transome exhaust so its really visible. I pulled the plugs and all the plugs on the left side were lean and the right side plugs were black. 2 850 Holley DP on a 6/71 driven 8% under. I'm jetted 96 primary and 98 secondaries. Running 32° at the dizzy locked out. Burning Av Gas. I was at 94 primary and 96 secondaries. when I noticed the transom, I re jetted up after I saw the transom but it didn't make a difference.

    Pyro was at 1250° at 3500 to 5000 rpms and stayed pretty constant. That was on the lean side, # 1 piston.

    Anyone ever deal with this kind of situation?
    HAY CAVE, I'VE GOT A SET OF 1000 CFM DEMON BLOWER CARBS YOU CAN BORROW TO HELP YOU TROUBLE SHOOT IT, IM NOT USING THEM RIGHT NOW, LET ME KNOW,
    I THINK I WILL BE IN GILBERT ON WENSDAY TO SEE THE KIDS
    YEA, WHAT 71 HALLET SAID

  13. #11
    two strokes is enough
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    Quote Originally Posted by FARMER JOHN View Post
    HAY CAVE, I'VE GOT A SET OF 1000 CFM DEMON BLOWER CARBS YOU CAN BORROW TO HELP YOU TROUBLE SHOOT IT, IM NOT USING THEM RIGHT NOW, LET ME KNOW,
    I THINK I WILL BE IN GILBERT ON WENSDAY TO SEE THE KIDS
    YEA, WHAT 71 HALLET SAID

    john got some stories to tell you about the weekend ill have to stop by this week. me and chris will be buffing his boat either tomorrow or wed swing by if your bored. check the pictures

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    CANT RE MEMBER FARMER JOHN's Avatar
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    Quote Originally Posted by dp85tona View Post
    john got some stories to tell you about the weekend ill have to stop by this week. me and chris will be buffing his boat either tomorrow or wed swing by if your bored. check the pictures
    OKIE DOKIE

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    New here Beer:30's Avatar
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    Quote Originally Posted by Hass828 View Post
    Make sure that your intake is snugged up, might be sucking a tiny bit of oil on that side if she's loosened up on ya a little.
    About the only way it could be one side is this or the gasket slipped during install.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Quote Originally Posted by 71hallett View Post
    I would be looking past the carbs....once the fuel hits the rotors in the blower the motor doesnt know where its comming from square or not. My.02

    I can make jet changes on my 1050's/10:71 setup front to back and the plugs will read different on different cylinders. I would square jet because its easy to try it........

    I agree with Dmoore......throw some boost at it.

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