how-to-get-the-most-from-berkeley-12jg-A
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how-to-get-the-most-from-berkeley-12jg-A

  1. #1
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    Default how-to-get-the-most-from-berkeley-12jg-A

    how-to-get-the-most-from-berkeley-12jg-AI have 557 ford all scat forage crank rod pistons, 429 heads with Cobra jet valves 2.25 ported and polished victor Junior 460 manifold all gasket match 950 cfm ultra Holley
    Holley blue fuel pump msd electronic with 6al box I think I'm going to push 700 to 750 hp I need help with the jet...
    how-to-get-the-most-from-berkeley-12jg-A
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    senior member turbo wog's Avatar
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    Quote Originally Posted by Mothyu812 View Post
    how-to-get-the-most-from-berkeley-12jg-AI have 557 ford all scat forage crank rod pistons, 429 heads with Cobra jet valves 2.25 ported and polished victor Junior 460 manifold all gasket match 950 cfm ultra Holley
    Holley blue fuel pump msd electronic with 6al box I think I'm going to push 700 to 750 hp I need help with the jet...
    how-to-get-the-most-from-berkeley-12jg-A
    i dont believe that the fuel pump will keep up with that kind of power. been there done that. if you lean out you can melt pistons & tullip your valves.
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  4. #3
    AKA OhOneWS6 Last Mohican's Avatar
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    Might help to know what hull you are working with.
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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Mothyu812 View Post
    how-to-get-the-most-from-berkeley-12jg-AI have 557 ford all scat forage crank rod pistons, 429 heads with Cobra jet valves 2.25 ported and polished victor Junior 460 manifold all gasket match 950 cfm ultra Holley
    Holley blue fuel pump msd electronic with 6al box I think I'm going to push 700 to 750 hp I need help with the jet...
    how-to-get-the-most-from-berkeley-12jg-A
    More info is key regarding where the motor your building makes power , the hull design and type , assuming your 12jg jet is stock with stock shaft and aluminum impeller at minimum you'll want to consider a stronger pump shaft and Stainless or Bronze Impeller, bowl work or upgrade, trim/diverter , shoe, rideplate, loader etc Tom
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    More information needed to give good answer as already shared by others. Someplace I read that Hp at WOT divided by 10 is rough approximation of fuel required in gallons per hour. Holley blue is rated as something like 88 gph at 9psi. I am guessing that rating is under ideal conditions so you may be a little skinny on the fuel pump like turbo wog stated.
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  8. #6
    Senior Member rpm0414's Avatar
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    Fuel pump so called charts are the biggest joke. Gph requirements on those charts is so out touch with reality. If that little of volume was needed you would never see 400-500 gph pumps ever designed. And yes that Holley blue is only good for a 350-400 hp motor. And that pump is not reliable IMO
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  9. #7
    Senior Member rpm0414's Avatar
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    But very interested in your pump question, I have a berk JC and looking to make better this winter
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  10. #8
    Senior Member DuaneHTP's Avatar
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    Default Pump up grades

    A question like yours will bring out all kind of answers. Some good; some bad. Each and every boat is a different application and has to be dealt with individually. General answer to your question is build a good tight pump, you will need things like a FTN diverter, top loader and several other items will greatly inprove the performance of your boat. For a pump builder to give you the biggest bang for your buck, you need a dyno sheet from your motor. Without it, there will be a lot of waisted time and money to get where you want to be. Not only will it help the builder to set you up correctly, you will probably pick up an extra 50 of so HP from dynoing your engine. Guessing at or estimating HP does not work to determine the proper cut of impeller. If you are interested in some personal help, give me a cll. That's all I've done for over 40 years. Thanks for your time.
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    Last edited by DuaneHTP; 12-29-2012 at 06:30 PM.
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    Senior Member $uperJoe's Avatar
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    duane does the HP off a dyno help tune more than the appropriate imp selection? as in specific loaders and nozzles or is those things hull specific?
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    Quote Originally Posted by rpm0414 View Post
    Fuel pump so called charts are the biggest joke. Gph requirements on those charts is so out touch with reality. If that little of volume was needed you would never see 400-500 gph pumps ever designed. And yes that Holley blue is only good for a 350-400 hp motor. And that pump is not reliable IMO
    well damn. i guess i should return the holley blue that was in my boat for 10 years, 11 championships and over 50 race wins. with just a little over 700hp...
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  13. #11
    Senior Member DuaneHTP's Avatar
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    Quote Originally Posted by $uperJoe View Post
    duane does the HP off a dyno help tune more than the appropriate imp selection? as in specific loaders and nozzles or is those things hull specific?
    The dyno chart with the HP and Tq curves help to get much closer to the appropriate Imp Selection the first time. Putting the engine on the dyno usually results in picking up a few extra HP. The loaders and nozzles are more application specific.

    Duane HTP
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    Default 76 Nordic bubble deck v- bottom

    76 Nordic bubble deck v- bottom 19 feet 1"
    460 ford punched out to 557
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  15. #13
    Senior Member rpm0414's Avatar
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    You shouldn't return that Holley blue you should bronze it. Lol. You sir have the only one in existence. Here's a thought replace it with a bigger fuel volume pump and watch your boat go quicker. Lets see I'm walking down the pit of pro mod or comp or pro stock car race and do I see an 80 gph pump?? Lol
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  16. #14
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    Of course the Holly Blue will work, but my opinion will effect top end. The fuel pump is rated as free flow. What effects the free flow are the size of the lines from tank, lines from pump to carb and then you add filters in between. Fords like a lot of fuel flow for best performance. I would upgrade from the Blue.
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