Friggin new guy...
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Friggin new guy...

  1. #1
    Member Romper Stomper's Avatar
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    Default Friggin new guy...

    Hey guys, I just bought my first boat and I have a million questions that I hope some of you seasoned gearheads can help me with. It's a '76 Glastron Carlson CVX-20 with a locked up 460 and Berkley pump with a Place diverter. I have another 460 I was building anyway so that's why I bought the boat. The motor I'm building should come in at right around 550hp. So, on with my questions--

    The I.D. plate on the jet says 12JE-A. Is that good? How much power can they handle?

    I have "regular" through- hull manifolds on it. Is there a way to run headers in a closed engine compartment without melting everything?

    It has a "regular" hand throttle on it. It it hard to convert to a foot feed?

    What kind of speed can I expect from this hull?

    Are there any low cost tweaks I can do to increase performance?

    Does anybody know of any good boneyards in the central Texas area?

    Im pretty handy with some wrenches and I've built many, many fast cars, but this my first foray into boats. Any feedback would be greatly appreciated. Budget is obviously a big factor, but I wont rule anything out. Also, I apprentice at a machine shop, so I've got the motor handled. Thanks in advance. I look forward to chatting with yous guys.
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  3. #2
    Hoodys and swim trunks Elkidminoltu's Avatar
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    I'm surprised more guys haven't jumped into this thread yet so I'll try to get the ball rolling. First off, congrats on the purchase of your first jet. I see you have a a nice lookin car in the garage so assuming you did the work yourself, you'll be able to attack and handle all the work needed on the boat. Before we get into your questions you should make sure you check the entire floor and stringers first to make sure it's all solid. No telling if the boat sat outside and something is rotting underneath. If you're putting 500+hp in a boat, it's good insurance to make sure the hull is solid. You can check all the wood with a hammer by tapping on the floor and stringers. If you come across a point that makes a dull thud, it's rotted and needs to be replaced.

    The I.D. plate on the jet says 12JE-A. Is that good? How much power can they handle? Yes, it's a standard Berkley pump and impeller. The addition of the place diverter is nice because it'll allow you to trim up and air out the hull for more speed. The pump can handle what you're going to throw at it, but you should REALLY have a professional go through it and bless it first.

    I have "regular" through- hull manifolds on it. Is there a way to run headers in a closed engine compartment without melting everything? You won't be able to do over-the-transom headers without cutting out big sections of glass (and you're ruining the resale of that particular hull by doing so). Lightening and others have high-rise headers that can be run at through-hull setups. This may get you where you're going. You can also grab the cast aluminum high-rise manifolds from an offshore boat which will flow more than your standard logs and snails.

    It has a "regular" hand throttle on it. It it hard to convert to a foot feed? Nope, they are two seperate cables. Buy the foot pedal, run the throttle cable to it. If you look behind the throttle mechanism you'll see how the two different cables work.

    What kind of speed can I expect from this hull? No idea, shoot high and expect low. 50's? My pig in my signature does 45 if I'm lucky, but it's a worn out small block with maybe 180hp.

    Are there any low cost tweaks I can do to increase performance? Everyone has their preferred techniques, but making sure the underside of the hull is straight and true with no hooks is a good start. Many will say the addition of a loader instead of the standard grate and/or a ride plate helps.


    Ask alot of questions, and use the search function. There is a ton of info on this forum as well as some pretty smart members who can lead you in a good direction.

    -Dave

  4. #3
    Senior Member Widetrack's Avatar
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    The hull you have is a good hull just heavy! They make good lake boats and 60 MPH is doable! There is a guy on Texas Hot Boats that has one and is doing his best to get the speed up on his! Elkid's reply is on the money for your questions! Good luck and welcome to the fun of jet boating!


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
    WT

    WFL Crew!!!

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    Senior Member jetboatperformance's Avatar
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    Congratualtions on your CVX purchase and Welcome to the boards ! Tom

  7. #5
    Resident Ford Nut Sleeper CP's Avatar
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    Someday I'm going to get one of those.........

    Congrats on the boat......I love those things.


    S CP

    "Dark Sarcasm"
    Going fast is only half the fun ... what you make go
    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

  8. #6
    Senior Member bp298's Avatar
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    there's nothing really wrong with a JE pump. they can work just fine in cruisers like the glastron. the caveat is that the suction piece of the pump is part of the hull - you can't just remove the entire pump for service. In order to completely service the pump, the engine has to be removed. fortunately, if it's rebuilt/serviced correctly, it'll last for years.
    if the engine has to be removed, that's the perfect time to have the pump rebuilt by someone that knows what they're doing. i'd suggest adding an inducer at that time.
    i'd also keep the hand throttle/shifter if it works as designed. even if it doesn't, i'd fix it and keep it.

  9. #7
    AKA OhOneWS6 Last Mohican's Avatar
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    Welcome to the board. That hull is very popular. You have a great start. Looks like that may be TX numbers and tags. What part of the country are you in?

    One of the guys over at THB (TexasHotBoats.com) has a Glastron he has done quite a bit of work to. He went from the stock 460, Then added a 150 shot, then to an aluminum headed 460 to and is now making the move to an LSx GM platform. If you are in the Dallas area there is a great group of guys around here that will help you out.

    I think James had a best of 67 and that was with the stock motor and the 150 shot.

    Here is a link to one of his threads. He has done a lot of the things you are asking about.
    http://www.texashotboats.com/forums/...?topic=11838.0

  10. #8
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    Someday I'm going to get one of those.........

    Congrats on the boat......I love those things.


    S CP
    We can fix that John , we own two and one for sale

  11. #9
    Member blazeracer's Avatar
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    I remember seeing that boat for sale on the Dallas Craigslist. I emailed the guy about it because that ones an oddity. That particular CVX hull was available from 77-79 in a jet. 76 had a different back end on it. But hey, just roll with what the title says. I'm the guy on THB with 78 CVX that was totally restored and is now getting converted to LS power.

    I'll expand a little more on a couple of question.

    I have "regular" through- hull manifolds on it. Is there a way to run headers in a closed engine compartment without melting everything? The bolt thru headers flow great and stay cool. You will have to ruin or remove the cover to run OT headers or spend A LOT of $$$$$ to get fully jacketed headers to run under the engine cover. I did a best of 67mph with a 150 shot of NOS on the stock motor with those manifolds, and 63 NA with an aluminum headed 466.

    It has a "regular" hand throttle on it. It it hard to convert to a foot feed? In theory you can because it is two separate cables, in reality there is a bulkhead in the way on a CVX and the gas tank sits right in front of it requiring a major modification to make it work, but it can be done. You will have to cut a notch in the bulkhead for the pedal. I didn't do it on my resoration, but I'll be doing the same on mine now bacause my LS motor has a drive by wire throttle body.

    Hope that helps. If your in the Dallas area look us up. We're at Lavon twice a week in the summertime.
    Last edited by blazeracer; 12-12-2011 at 01:30 PM.

  12. #10
    Member Romper Stomper's Avatar
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    Thanks for the feedback, guys. I was kind of nervous when I bought it, but I'm getting more and more pumped as I'm learning more about it! I think its pretty slick looking myself and it seems you can get adequate performance out of 'em. I've lived about a 1/4 mile away from a lake for 3 years and I just couldn't take it anymore! I had to get something. Had to. I've worked it over with a hammer and it seems pretty solid. Just a couple of weak pieces of plywood in the engine compartment. Since I'm pulling the motor anyway, they shouldn't be too hard to replace (famous last words, right? Lol). I've got 500 bones invested like it sits plus an extra running motor, so I think I'm starting off on the right foot. Thanks again, guys. Keep it coming!

  13. #11
    Member Romper Stomper's Avatar
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    Quote Originally Posted by blazeracer View Post
    I remember seeing that boat for sale on the Dallas Craigslist. I emailed the guy about it because that ones an oddity. That particular CVX hull was available from 77-79 in a jet. 76 had a different back end on it. But hey, just roll with what the title says. I'm the guy on THB with 78 CVX that was totally restored and is now getting converted to LS power.

    I'll expand a little more on a couple of question.

    I have "regular" through- hull manifolds on it. Is there a way to run headers in a closed engine compartment without melting everything? The bolt thru headers flow great and stay cool. You will have to ruin or remove the cover to run OT headers or spend A LOT of $$$$$ to get fully jacketed headers to run under the engine cover. I did a best of 67mph with a 150 shot of NOS on the stock motor with those manifolds, and 63 NA with an aluminum headed 466.

    It has a "regular" hand throttle on it. It it hard to convert to a foot feed? In theory you can because it is two separate cables, in reality there is a bulkhead in the way on a CVX and the gas tank sits right in front of it requiring a major modification to make it work, but it can be done. You will have to cut a notch in the bulkhead for the pedal. I didn't do it on my resoration, but I'll be doing the same on mine now bacause my LS motor has a drive by wire throttle body.

    Hope that helps. If your in the Dallas area look us up. We're at Lavon twice a week in the summertime.

    I live about an hour N/W of Austin, so I'll probably hit you guys up in the future. I didn't look on craigslist or anything, I was just cruising through town last Saturday and saw it for sale. The guy I got it from was a kind of shady looking Hispanic guy that didn't know anything about it except: "Its fast." "The paint is berry good. I just barely put it on there." and "The motor don't work no more.". So, that being said, the title says '76 and the data plate on the trailer says '76. Maybe its a late production '76/early '77? I don't know. Also, I looked a little more about the foot pedal and I'm thinking probably not. I'm 6'2" and all legs, so its probably more work than its worth. We shall see...

  14. #12
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    Hand throttles are great for waterskiing and are safe for up to 60-65; Watch for water under the floor- there are plugs in the engine compartment so take them out and tilt the hull up so any water runs out....Also, around the floor cut-outs for the engine mount thru bolts you can have gaps that allow leaks under the floor....I have experience in all this plus....replacing the floor! Here's mine....a '77 with 400hp 460 @ 62.....

    PS; when I replaced the floor, I moved the kick panel forward 8"- I actually built some brackets and bolt it in.....
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    Last edited by cvxjet; 12-12-2011 at 07:33 PM.

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