Fuel Efficiency
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Fuel Efficiency

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    Senior Member Brendellajet's Avatar
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    Default Fuel Efficiency

    Curious to get some input on what you all think a set of dual carbs would do to my fuel spending. Id make more power so I expect to use more gas. Question is how much more gas & power? Motor is a 548 with a HP950, wilson ported Victor jr. Currently making 800 @ 6200 rpm in a jetboat.

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    Boat 502 76Miller's Avatar
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    Quote Originally Posted by Brendellajet View Post
    Curious to get some input on what you all think a set of dual carbs would do to my fuel spending. Id make more power so I expect to use more gas. Question is how much more gas & power? Motor is a 548 with a HP950, wilson ported Victor jr. Currently making 800 @ 6200 rpm in a jetboat.
    If I remember right, Futs had a dual carb/tunnel deal and changed over to a single carb, on that Southwind cruiser he is selling. Maybe pm him. Also, Sleeper CP might have some experience w/ this ????

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    Steady Rollin
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    This is a pretty solid topic at these times.

    I'm currently debating which way to go on the repower of my v-drive cruiser. I'm currently going between single carb N/A, and dual carb turbo.

    I'd love to hear some real world stories

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    cfm
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    Quote Originally Posted by Brendellajet View Post
    Curious to get some input on what you all think a set of dual carbs would do to my fuel spending. Id make more power so I expect to use more gas. Question is how much more gas & power? Motor is a 548 with a HP950, wilson ported Victor jr. Currently making 800 @ 6200 rpm in a jetboat.
    If you are really making 800hp with a 815cfm carb on a worked over Vic JR I would say you would make 60-80hp or so more with something like a Dart Tunnel Ram and guru worked carbs. At the same time, I'd say 35-40hp more with a Victor 454R or Super Vic with a 1050.


    Remember, a Holley 950 is really just a 750 main body on top of an 850 base plate.

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    cfm
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    Ooops. Just noticed you said 548", which must be a Ford. I assumed Chevy. So schit can the Dart Tunnel Ram, but use the info I said above with a Ford equivalent to the Dart Tunnel Ram.

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    Boat 502 76Miller's Avatar
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    I say you put a nice fogger on it and keep your current bad a$$ set up. A tunnel ram, another carb, and a possible cam swap...to really see a hp increase sounds like alot of coin. Then you get it at the pump everytime too, w/ those thirsty carbs. imo

    Ps- thanks alot for the wiring tips, it turned out killer !

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    I'm in the same boat debating switching to dual carbs. I would like to hear from someone with some real world experience as well.

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    Quote Originally Posted by cfm View Post
    If you are really making 800hp with a 815cfm carb on a worked over Vic JR I would say you would make 60-80hp or so more with something like a Dart Tunnel Ram and guru worked carbs. At the same time, I'd say 35-40hp more with a Victor 454R or Super Vic with a 1050.


    Remember, a Holley 950 is really just a 750 main body on top of an 850 base plate.
    It's interesting, do you have some Data to go along with your (estimation) of power,or
    torque. and at what RPM. I personally have never seen 60 or 80 or anything close
    with tunnel ram vs. a single 1x4,,, runner length as well as available CFM are both to be considered

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    TEN THIRTY ONE RCB19's Avatar
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    Quote Originally Posted by Steve Brule' View Post
    It's interesting, do you have some Data to go along with your (estimation) of power,or
    torque. and at what RPM. I personally have never seen 60 or 80 or anything close
    with tunnel ram vs. a single 1x4,,, runner length as well as available CFM are both to be considered
    What's going on Steve? I see you found us.
    RCB

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    B1 Racing cs19's Avatar
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    Good to see you posting over here Steve!
    B1Racing.net

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    Senior Member hotbo's Avatar
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    single carb it dominator set-up right just imo they are great and get good fuel consumption



    i by no means am a t-ram fan all about looks imo.but then again chris runs a single carb and his boat seems to run like a bat outta hell form what i here and see.so go figure


    good luck and whatever you choose i hope yu might a good choice and it works for ya,travis

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    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by Steve Brule' View Post
    It's interesting, do you have some Data to go along with your (estimation) of power,or
    torque. and at what RPM. I personally have never seen 60 or 80 or anything close
    with tunnel ram vs. a single 1x4,,, runner length as well as available CFM are both to be considered
    Hi Steve,

    I think you might have some data on it, you dynoed the motor. It was a DNE motor, made 800 @ 6200 rpm, made 825 @ 6800. Dynoed in January of 2007(I think)

    Intake is a victor Jr that we sent to Wilson to have hogged out. Spent 2k on porting. Considering the amount of money I have in the singel four Im wondering what the advantage would be of going to the tunnel ram. Im sure I might see a bit more in the upper RPM range.

    Im turning a Heritage A impeller to 5800 which according to Jack takes about 775hp, which is right inline with my dyno #'s.

    Im wondering if a bigger carb might get me some more R's...? Or maybe the tunnel ram is the way to go-but only if I could re-coup some of my investment in the V-jr.

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    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by 76Miller View Post
    I say you put a nice fogger on it and keep your current bad a$$ set up. A tunnel ram, another carb, and a possible cam swap...to really see a hp increase sounds like alot of coin. Then you get it at the pump everytime too, w/ those thirsty carbs. imo

    Ps- thanks alot for the wiring tips, it turned out killer !
    Glad I could help on the wiring. Getting ready to do my dads boat. One of those often overlooked things.

    I may go with the NOS. Motor is ready for it, just wanted to up the power a little more if it wouldn't be too pricey. I've got a lot into the single four sleeper setup so I figured if I found a buyer I could finance the tunnel ram that way.

    Sounds like NOS is best way to go. Im probably going to wait until I come across a dominator suction housing though.

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    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by cfm View Post
    Ooops. Just noticed you said 548", which must be a Ford. I assumed Chevy. So schit can the Dart Tunnel Ram, but use the info I said above with a Ford equivalent to the Dart Tunnel Ram.
    Its a Chevrolet 548.

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