Replace 12JE with a 12JG?
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Replace 12JE with a 12JG?

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    Default Replace 12JE with a 12JG?

    My boat has a 12JE in it and i was going to convert to a split bowl. Well luck would have it i found a entire 12JG drive that is in good shape. Any advantage to installing that entire drive into my boat and forget about converting the 12JE? It would be on a 1989 16ft Tahiti. Thanks for any input, not sure if the intake angle is less or any advantage like that with the 12JG.

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    Large Member edog's Avatar
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    I was going to try it on my 16' Carribean. It looked like a pretty easy job at first. Then I looked at the transom and it had a pocket built in it,and looked like alot more glass work then I wanted to get involved at that point. If it didn't have the pocket I think I could have cut out the intake that is built into the boat and set an intake for the 12jg with little glass work.

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    Alright so it is definatly work ha. I'm not a master with fiberglass so i think i'll end up converting the JE. I have a lot of nice extra parts now atleast!

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    Senior Member DuaneHTP's Avatar
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    If you do a set back at the same time, it's not too much of a fiberglass job.
    This is the part you cut out.


    This is after the new intake is installed.


    This is the finished job.



    You can see that there is not really that much glass work involved.
    Duane HTP

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    Senior Member Luckie Stiff's Avatar
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    That looks great Duane. I'm looking at a 21' cruiser with an E pump in it and I was wondering how hard this swap would be. Looks easier than I had envisioned.
    "Don't you realize that there are already enough people in the world to hate without you putting in so much effort to give me another?"

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    Alright well that looks pretty painless. Is there any noticable performance gain by doing this over the E series pump? I was planning on a E series with a snoot, rideplate, and a loader. Would i be better off going with the JG as far as performance goes? Its no race boat just looking for a little more speed as usual. You all know how that goes

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    Boat Nut sleekcrafter's Avatar
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    There was a Taylor SJ I believe that had a swap out done, and was powered by a SBC to boot, ended up running in the 90's I think. I think Duane knows of the boat.
    Upper Midwest Power Boat Association
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    Senior Member DuaneHTP's Avatar
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    I'd say yes, go with the JG and the Snoot. A "little more speed" ALWAYS turns into a "lot more speed". And it's a lot easier to do with a JG pump than it is an E-Series. The JG with a shoed intake and ride plate will give you a lot more total boat control and attitude adjustment possibilities. If you're never going to go over 55 -60 mph, then it probably isn't worth it. Duane HTP
    Last edited by DuaneHTP; 02-01-2010 at 06:37 PM.

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    Quote Originally Posted by DuaneHTP View Post
    I'd say yes, go with the JG and the Snoot. A "little more speed" ALWAYS turns into a "lot more speed". And it's a lot easier to do with a JG pump than it is an E-Series. The JG with a shoed intake and ride plate will give you a lot more total boat control and attitude adjustment possibilities. If you're never going to go over 55 -60 mph, then it probably isn't worth it. Duane HTP
    I'm already running 62 with it and thats taking in consideration that my current pump as a .071" clearance between the impeller and wear ring, its seen its better day. I just have a mild SBC in it and with pump work and adding a 100 shot of nitrous, i was hoping to get up around 70mph with either pump setup. I'm just kinda gathering info right now because i have no clue what direction is going to the best bet, project wont start until a month or so. Duane i'm sure i will be giving you a call when that time comes!

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    Alright well problem number one, i dont have a intake for the JG. Is that a expensive item or something that can be found used?

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    Senior Member IRRebel's Avatar
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    Plenty around. But there are different castings of Berk Intakes. Any Berk intake will work with it though. I think the difference is in what hull it was intended for.

    The thought has crossed my mind with the JE in Moo as well, but I really want to see how far I can take the JE first. I'm not unimpressed with it!

    Kinda funny everyone calls it a POS, while at the same time setting back their JG's to a similar configuration . But it's essentially the same pump, same impeller, same bowl, different nozzle (Low profile steering and f/r controls), other than that, not a dissimilar animal.

    There may well be something to the intake size differences. I've never taken a tape to mine. (I have boats with a JB, a JC, a JE and now a JG. Maybe I should do that).

    Ray

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    Quote Originally Posted by IRRebel View Post
    Plenty around. But there are different castings of Berk Intakes. Any Berk intake will work with it though. I think the difference is in what hull it was intended for.

    The thought has crossed my mind with the JE in Moo as well, but I really want to see how far I can take the JE first. I'm not unimpressed with it!

    Kinda funny everyone calls it a POS, while at the same time setting back their JG's to a similar configuration . But it's essentially the same pump, same impeller, same bowl, different nozzle (Low profile steering and f/r controls), other than that, not a dissimilar animal.

    There may well be something to the intake size differences. I've never taken a tape to mine. (I have boats with a JB, a JC, a JE and now a JG. Maybe I should do that).

    Ray
    Dam ray

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    Senior Member hotbo's Avatar
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    Quote Originally Posted by IRRebel View Post
    Plenty around. But there are different castings of Berk Intakes. Any Berk intake will work with it though. I think the difference is in what hull it was intended for.

    The thought has crossed my mind with the JE in Moo as well, but I really want to see how far I can take the JE first. I'm not unimpressed with it!

    Kinda funny everyone calls it a POS, while at the same time setting back their JG's to a similar configuration . But it's essentially the same pump, same impeller, same bowl, different nozzle (Low profile steering and f/r controls), other than that, not a dissimilar animal.

    There may well be something to the intake size differences. I've never taken a tape to mine. (I have boats with a JB, a JC, a JE and now a JG. Maybe I should do that).

    Ray
    there is nothing wrong with a E-pump if setup right and you can keep it loaded.

    i had a special loader made for mine by Scotts Marine and it solved 95 percent of my problems.the biggest thing i find is you need to tap the pump ad take pressures to make sure your loading water.

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    Senior Member DuaneHTP's Avatar
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    [QUOTE][There may well be something to the intake size differences. I've never taken a tape to mine. (I have boats with a JB, a JC, a JE and now a JG. Maybe I should do that)./QUOTE]

    Very good thinking. Measure the difference in total water rise and drop through the pump, and measure the difference of degree angle that the water has to turn to get into the impeller, (in a shorter distance). With a little research, you'll find the difference and then know what you are talking about. The faster you go, the more the water trys to bypass the steep entry angle of the hull insert opening. Good pumps. just not normally conducive to very high speed.
    Duane HTP

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