Newby with jet question
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Newby with jet question

  1. #1
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    Default Newby with jet question

    This is my first jet boat. Just bought a 94 Cheyenne 19 tunnel. Has a 468 solid roller dart pro 1 heads jesel belt drive 13.5 to 1 comp and a 1050 dominator. Supposedly dynoed at 680 hp. It is a berkly jet with droop. Just tore pump apart. Has Alot of play in it. The impeller is bronze cant find any markings on it. Also has an inducer. Took it to river and top speed only 80 and seems slow take off. Turns 6200 and raps to around 7300 on take off. Previous owner claimed 106 mph. Don't know if I believe but figured in the 90s. Am I wrong or is something wrong with boat and what to improve speed. Thanks for any help.
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  3. #2
    Retired Air Force Master Sergeant's Avatar
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    106 mph is possible but the pump set up needs to be right. Pump work, the right shoe and ride plate angle can make a big difference in top speed. Find a good pump guy to help. Ease in to the throttle a little at the start rather than letting rpm slip up so high

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    I would add a place diverter


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  6. #4
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    Don't know much about loader ride plate or shoe but this is what's on the boat.
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  7. #5
    Senior Member hellnback's Avatar
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    I think an impeller and wear ring should give you 10 more .... man that thing is beat ...
    It may be OLD ,it may be Slow ... but at least it's MOBILE !!!

  8. #6
    Blown, OHBA Member Wild Hair's Avatar
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    Nice ride. Your a lucky man. It took me 30 years to get a Cheyene but it was worth the wait.

    I am running 82 with a 496 at 5900 with an A/B impeller, and like you I want it in the tripple didgets. A friend is helping me set up the pump. He had me drill and tap the the pump housing for pressure readings in two places, One at about 7 Oclock and one at about 11 Oclock. The way I'm understanding it is i'm shooting for around 35 to 40 pounds of intake pressure at wide open throttle. If you not showing any pressure at WOT then the pump is starving for water. The pressure readings help you determine if you need to add or remove shoe or loader. If I'm understanding what my friend has told me then the reading from the bottom port is for shoe and the top port is for loader.

    At this time my pump tuning is on hold as I am changing from naturaly asperated to blown for next year and no sense tuning the pump twice. Do a search for the things you have questions on, theres a lot of smart people and good info here. Don't be afraid to ask questions, even dumb questions have saved time and money in the past.

    Oh yes take that impeller to someone that can check it out for you, it might can be saved. A good wear ring and impeller is a must. Picking the right one is the trick.

    Good luck and welcome aboard
    Don

    PS where you located?
    Last edited by Wild Hair; 08-21-2011 at 05:25 AM.
    OHBA GROWTH THROUGH PARTICIPATION
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  9. #7
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    Thanks I will do some more research on these things. May go ahead and send impeller off so will know what it is and if it's still good.

    There are two holes with plugs on the back of the pump. Is that where I need to read pressure from?

    Was thinking about rebuilding pump my self. Have worked in machine shop for a while and doesn't look to bad to rebuild. But I might be mistaking.

    In north Florida just south of Tallahassee

  10. #8
    Senior Member GA Jet's Avatar
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    Quote Originally Posted by tunnel28 View Post
    Thanks I will do some more research on these things. May go ahead and send impeller off so will know what it is and if it's still good.

    There are two holes with plugs on the back of the pump. Is that where I need to read pressure from?

    Was thinking about rebuilding pump my self. Have worked in machine shop for a while and doesn't look to bad to rebuild. But I might be mistaking.

    In north Florida just south of Tallahassee
    I think those holes you are talking about are for oil

  11. #9
    Blown, OHBA Member Wild Hair's Avatar
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    Quote Originally Posted by tunnel28 View Post
    Thanks I will do some more research on these things. May go ahead and send impeller off so will know what it is and if it's still good.

    There are two holes with plugs on the back of the pump. Is that where I need to read pressure from?

    Was thinking about rebuilding pump my self. Have worked in machine shop for a while and doesn't look to bad to rebuild. But I might be mistaking.

    In north Florida just south of Tallahassee
    The plugs on the bowl are for oil as GA Jet stated. the plugs in mine I put there for taking intake pressure readings as I make changes in the shoe and loader. your pump will not have them unless another owner put them there for the same reason.

    Rebuilding your pump is not that hard to do. I would call Tom at Jet Boat Performance he will have everything you need to do the Job right. He is one of the best ones here to talk to when you need help, and he is always willing to help.

    Sent you a PM (private message)
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  12. #10
    Senior Member motomattox's Avatar
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    "This is my first jet boat. Just bought a 94 Cheyenne 19 tunnel."


    Man, you got one helluva boat on your hands! Especially for a first jet boat. Don't know your previous boat experience, but know that you've got a boat that will pucker your a-hole in an instant lol. Be careful getting to know her. That boat is more than capable of the triple digits you seek, and yes, you need to go through the pump. But more than just a rebuild, it needs to be setup properly. Is there a bump, or "bubble" on the keel just ahead of the intake? Didn't look like in the pic. Also curious what (if any) shims are under the shoe. Not to beat a dead horse but be careful running at those speeds until you've got some seat time to recognize when to lift...stay safe. And congrats on the purchase
    "Keep talking...it aint often I get to hear a genius speak"

  13. #11
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    Thanks for keeping the info coming. Seems like y'all try to help out Alot on this forum. Yes I have been pretty fast in some outboard boats all pads but this is the fist tunnel boat. I bought the boat because I'm a major gear head and have been building BBC engines for a while. Who needs a 2.6 merc when u can have well over 600 inches strapped behind you. I was kinda hoping to get in this thing and shut all my local outboard buddies up but not happening right now. Maybe with all of the help from here it want be long.

    There is a little hump that runs down the boat in front of the loader but not sure if that's what your askink about. I'll post a little better pic. I don't think there is any shims either.
    Thanks again guys.
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  14. #12
    Senior Member motomattox's Avatar
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    It would be great if you had any info on the history of this boat, specifically who laid it up and rigged it. Usually Tommy (Tom Papp, maker of the boat) would flip the hull over and put a spoon shaped "bubble" on the keel that tapered into the intake. Yours does not seem to have that. Not a big deal, can be added. It will help keep the pump loaded. Also, doesn't look like there is a pop-off valve. Running those speeds it should have one. Take your time, ask questions, etc. There are a lot of fans of that hull on here, a lot of guys that race them and have set them up. Congrats again. A little time to get her set up and you will be smoking your buddies boats lol
    "Keep talking...it aint often I get to hear a genius speak"

  15. #13
    Blown, OHBA Member Wild Hair's Avatar
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    Quote Originally Posted by motomattox View Post
    It would be great if you had any info on the history of this boat, specifically who laid it up and rigged it. Usually Tommy (Tom Papp, maker of the boat) would flip the hull over and put a spoon shaped "bubble" on the keel that tapered into the intake. Yours does not seem to have that. Not a big deal, can be added. It will help keep the pump loaded. Also, doesn't look like there is a pop-off valve. Running those speeds it should have one. Take your time, ask questions, etc. There are a lot of fans of that hull on here, a lot of guys that race them and have set them up. Congrats again. A little time to get her set up and you will be smoking your buddies boats lol
    I talked to him last night for a while on the phone, a very respectfull young man that deserves all the help we can muster up.

    He said he would post up the hull Id letters so we could ID the builder. From the looks of the pics I don't think this boat has a race keel. Not all were built with them, that I believe was an option you paid more for. Also looks like the shoe is droped down a half inch or more to catch some water, I don''t know but that seems a bit on the low side to me. May be that way to compensate for the lack of a race type keel.

    Didn't think to ask if the boat had a Jet Away, pop off, or a low pro intake for that mater. Mabe he can post a pic of the pump on the inside for us.

    Come on you guys with tunnels, chime in here and help this young man out with his first jet. You know some one here would help you if you needed it.
    OHBA GROWTH THROUGH PARTICIPATION
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    well the block is GM any ways


    GOD BLESS AMERICA AND KEEP HER SAFE

    LOCK N LOAD AMERICA, OUR 2nd AMENDMENT
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  16. #14
    "Need For Speed" Gearhead's Avatar
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    Quote Originally Posted by Wild Hair View Post
    I talked to him last night for a while on the phone, a very respectfull young man that deserves all the help we can muster up.

    He said he would post up the hull Id letters so we could ID the builder. From the looks of the pics I don't think this boat has a race keel. Not all were built with them, that I believe was an option you paid more for. Also looks like the shoe is droped down a half inch or more to catch some water, I don''t know but that seems a bit on the low side to me. May be that way to compensate for the lack of a race type keel.

    Didn't think to ask if the boat had a Jet Away, pop off, or a low pro intake for that mater. Mabe he can post a pic of the pump on the inside for us.

    Come on you guys with tunnels, chime in here and help this young man out with his first jet. You know some one here would help you if you needed it.
    IMO, the first step is to know the first three digits of the S/N so we can verify who constructed the hull There are a couple of variations of the keel from manufacturer. Also if we could determine the layup, being is it a lake or race and what the hull weight may be. I am going to guess it may be a lake layup as it appears to have a radius keel, but not a drop keel. The next area will to determine what intake is in the boat. The intakes generally varied by who constructed the boat. Take a good look at the intake inside the boat and see if it has any identification. Agressor, Alpha? I don't see shims in the shoe, all I am seeing is a 1/2" shoe, which would be a normal starting point.

    Once these items are determined, then a plan of action can be addressed. If you do want to run high speed, a drop keel is probably in your future. Where are you located geographically. We can probably help get you in contact with a knowledgable glass man that can assist with this part of the project.

    Wild hair, you are doing a good job in answering this fellow's initial questions and offering him some good direction.

    Gear
    Last edited by Gearhead; 08-23-2011 at 08:22 AM.

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