Dominators or 4150's????
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Dominators or 4150's????

  1. #1
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    Default Dominators or 4150's????

    572 ci
    Dart Aluminum heads (old school not the pro-1's)
    Big solid roller
    CMI headers
    littlefield tall deck blower intake
    TBS chiller
    littlefield 10:71 blower
    8:2:1 comp
    around 6lbs of boost on my 93 pump gas setup

    I have two Dominators (3 circuit), 4.5 power valves, 100 main jets (all the way around). Boat idles "OK" at about 850-900 rpm, mid range is great (no black transom but plugs look good), WOT is good on the plugs. Motor runs nice but sucks fuel....about .5 mpg if not less at cruise speed.

    TBS recomended I do boost referenced 4150 950's. Thought I would pick up power, idle qualitys, and better fuel milage.

    What do you guys think????

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  3. #2
    Senior Member Jake's Avatar
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    Quote Originally Posted by Big Cliff View Post
    572 ci
    Dart Aluminum heads (old school not the pro-1's)
    Big solid roller
    CMI headers
    littlefield tall deck blower intake
    TBS chiller
    littlefield 10:71 blower
    8:2:1 comp
    around 6lbs of boost on my 93 pump gas setup

    I have two Dominators (3 circuit), 4.5 power valves, 100 main jets (all the way around). Boat idles "OK" at about 850-900 rpm, mid range is great (no black transom but plugs look good), WOT is good on the plugs. Motor runs nice but sucks fuel....about .5 mpg if not less at cruise speed.

    TBS recomended I do boost referenced 4150 950's. Thought I would pick up power, idle qualitys, and better fuel milage.

    What do you guys think????

    Main jets sound a little big to me I have 80's in my 580's with a 10 with 10 to 12 pounds of boost. I had my dominators vacume referenced and don't notice much diffrence in performance but it stopped blowing power valves when the motor would cough back when starting.
    Last edited by Jake; 11-16-2008 at 06:42 PM.

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    I worked my way up from 94 main jets all the way around, reading the plugs as I went. I got up to 100 jets before the plugs looked good. Looked way lean on the 94's and 98's.

    Mine are not boost referenced though. I'm thinking something is not right with my setup.

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  6. #4
    Senior Member Jake's Avatar
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    Quote Originally Posted by Big Cliff View Post
    I worked my way up from 94 main jets all the way around, reading the plugs as I went. I got up to 100 jets before the plugs looked good. Looked way lean on the 94's and 98's.

    Mine are not boost referenced though. I'm thinking something is not right with my setup.
    That sounds awfully rich to me from what I experience in my motors (2 both set up the same way) Mine are even rich with 80's. Timing? I think mine is set at 30 full advance (a little conservitive). Maybe the vacume reference has something to do with it. Tom at pro marine in Havasu did my carbs maybe he could help you. Also it's how you are reading your plugs, if you want an accurate reading turn off the motor in mid range-read and after full throttle-read, otherwise your reading the plugs at idle.
    Last edited by Jake; 11-16-2008 at 08:41 PM.

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    Senior Member VDRIVERACING's Avatar
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    Blown 572 with dominators and 100 jets eating up a lot of gas. Hmmm, what could be the problem here...
    Last edited by VDRIVERACING; 11-16-2008 at 07:20 PM.

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    Cantard 71hallett's Avatar
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    I have a kinda feelin that with 100 jets you have a fuel supply problem? Whats the rest of the fuel system?
    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 Jake's Avatar
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    Quote Originally Posted by 71hallett View Post
    I have a kinda feelin that with 100 jets you have a fuel supply problem? Whats the rest of the fuel system?
    Good point, these motors will need a fuel pump able to pump 120 gals an hour minimum and at leased 3/8 feed lines.

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    Quote Originally Posted by VDRIVERACING View Post
    Blown 572 with dominators and 100 jets eating up a lot of gas. Hmmm, what could be the problem here...

    Thanks that was a helpfull answer......lol......dumbass......

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    Quote Originally Posted by Jake View Post
    Good point, these motors will need a fuel pump able to pump 120 gals an hour minimum and at leased 3/8 feed lines.

    Mallory Model 140 fuel pump. 120+gph at 6psi (have it at 8psi at idle). I'm running -10 to the regulator and -8 to the carbs (i think, will check tonight).

    I have two identical fuel pumps on each tank and can switch from tank to tank.

    I'm thinking the carbs need to be boost referenced........This is my first carb'd motor so its all new to me.

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    This pic shows the main line coming into the regulator and the 4 lines coming out going to the carbs. Maybe all the 90 degree fittings on the carbs are hurting me???
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    Cantard 71hallett's Avatar
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    Quote Originally Posted by Big Cliff View Post
    This pic shows the main line coming into the regulator and the 4 lines coming out going to the carbs. Maybe all the 90 degree fittings on the carbs are hurting me???
    Is that a 3/8 npt fitting going into the reg?
    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 71hallett View Post
    Is that a 3/8 npt fitting going into the reg?

    Can you point out what your are seeing in the pic with ms paint?

    Everything is AN fittings on the regulator except the line for the fuel pressure gauge.

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    Senior Member Jake's Avatar
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    Another very important thing to check is if your tanks feed lines have check valve ass'blys, U-know if the boat is upside down closes fuel line. Too restrictive! I have a Holley 120GPH black pump on each motor and they won't keep up to WOT demands, Idle at 8lbs, WOT 5lbs this is border line, will have to improve pumps but most bigger pumps require return lines to the tank. Additionally, with 80 jets I still black the transom it is so rich but I would rather be rich than lean. Another option is a call to Ralph Gore fuel systems for help, that might be my next call. Here's a pic of my set-up.
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  16. #14
    Cantard 71hallett's Avatar
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    Quote Originally Posted by Big Cliff View Post
    Can you point out what your are seeing in the pic with ms paint?

    Everything is AN fittings on the regulator except the line for the fuel pressure gauge.
    I was looking at the fitting that is on the feed line that goes into the reg. (looks like -8 oring to -10 an?) I have also seen regs that will not flow what the pump should.....just ideas..
    Last edited by 71hallett; 11-17-2008 at 10:56 AM.
    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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