jetaway or pop off for a lake boat
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jetaway or pop off for a lake boat

  1. #1
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    Default jetaway or pop off for a lake boat

    Working on trying to get my motor finished and have to start working on the pump. ITS A 19' LIBERATOR DAYTONA WITH A TWIN TURBO 468. Hp will be between 1000-1200 depending on boost. I will be a lake/river boat. I would like to run both, but dont have the money. If it matters on impellor size, either running a AA high helix, or a AAA

    Dan

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    Quote Originally Posted by 79centurion View Post
    Working on trying to get my motor finished and have to start working on the pump. ITS A 19' LIBERATOR DAYTONA WITH A TWIN TURBO 468. Hp will be between 1000-1200 depending on boost. I will be a lake/river boat. I would like to run both, but dont have the money. If it matters on impellor size, either running a AA high helix, or a AAA

    Dan
    if i could only have one it would be a pop-off...about all a jetaway does is let you start your motor on the trailer easier...for saftey, pop-off all the way

  4. #3
    Senior Member Ken F's Avatar
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    Quote Originally Posted by blue wonder View Post
    if i could only have one it would be a pop-off...about all a jetaway does is let you start your motor on the trailer easier...for saftey, pop-off all the way
    BlueWonder...

    I'm sorry but you are very wrong. Starting the boat on the trailer is just one side-benefit of a jet-a-way. (though a very useful one!)

    The jetaway allows your pump to rachett and for water to continue to exijt the pump if the engine quits or seizes at speed. In this senerio the boat is moving down the water at speed...your loader and bottom are still loading water into the pump.
    IF...all of a sudden your engine quits turning- water is still being forced into the pump. If the impellor all of a sudden quits turning this causes the water being forced into the intake to build and has no where to go ... thus raising the rear of the boat....usually causing you to loose control and stick a sponson. This is exactly why all racing assn's require you to have one before you may race.

    Were it me...I'd choose the jet away if I could only run one of the two due to the fact that it DOES provide the ability to put the pump into "neutral" and run the boat on the trailer.
    I can't tell you the number of times this has proven invaluable to me.

    With the HP the original poster is planning to run in his boat he definatly needs one to be safe.

    Hope this helps...

    Ken
    Last edited by Ken F; 12-16-2011 at 05:36 AM.
    The liberals are asking us to give Obama time. We agree and think 25 to life would be appropriate.

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    Quote Originally Posted by Ken F View Post
    BlueWonder...

    I'm sorry but you are very wrong. Starting the boat on the trailer is just one side-benefit of a jet-a-way. (though a very useful one!)

    The jetaway allows your pump to rachett and for water to continue to exijt the pump if the engine quits or seizes at speed. In this senerio the boat is moving down the water at speed...your loader and bottom are still loading water into the pump.
    IF...all of a sudden your engine quits turning- water is still being forced into the pump. If the impellor all of a sudden quits turning this causes the water being forced into the intake to build and has no where to go ... thus raising the rear of the boat....usually causing you to loose control and stick a sponson. This is exactly why all racing assn's require you to have one before you may race.

    Were it me...I'd choose the jet away if I could only run one of the two due to the fact that it DOES provide the ability to put the pump into "neutral" and run the boat on the trailer.
    I can't tell you the number of times this has proven invaluable to me.

    With the HP the original poster is planning to run in his boat he definatly needs one to be safe.

    Hope this helps...

    Ken
    I totally agree. I had one on my 800hp daytona and loved it. One more benefit is that you still have a little steering with the jet away if the engine dies, more so on a v-hull (I managed to avoid running over a fisherman in a tube after my Daytona died when I let out of the throttle, and it was still scary for both of us) Being able to tune or even run the engine without the pump turning is WAY under appreciated until you have had a boat with a Jet-away. I used to sit in the party cove and stuff towels in the headers and fire the boat when a freinds jet ski came up behind the boat, pretty damned funny if your not expecting it.

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    Senior Member Widetrack's Avatar
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    Jet a way first then a pop off when you can afford one! If you are not planning on racing full time jet a way is the way to go!

    On some boats a pop off will require boat modifaction to fit if the pump isn't set back far enough! Good luck!


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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    Senior Member Boat 405's Avatar
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    It's kinds like guys who build huge hp for their car to go fast and have stock brakes..... Spend the money for the parts to slow it down properly. A pop-off is IMO a must for a daytona with 1000-1200 hp.

    With that kind of power speeds up and above 120 are likely. Ever try to slow a daytona down from 120 + without a pop off.... Talk to few guys who have and they will all say the same thing. "I won't drive it again without a pop off."

    If you don't agree that's fine. It would not make sense to spend $20K on a motor and not spend the $1000 - 2000 on a safety device
    Boat 405.

  9. #7
    B1 Racing cs19's Avatar
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    If it had to be one or the other it would be a pop off no question about it..

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    Senior Member bp298's Avatar
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    Quote Originally Posted by Ken F View Post

    The jetaway allows your pump to rachett and for water to continue to exijt the pump if the engine quits or seizes at speed. In this senerio the boat is moving down the water at speed...your loader and bottom are still loading water into the pump.
    IF...all of a sudden your engine quits turning- water is still being forced into the pump. If the impellor all of a sudden quits turning this causes the water being forced into the intake to build and has no where to go ... thus raising the rear of the boat....usually causing you to loose control and stick a sponson. This is exactly why all racing assn's require you to have one before you may race.

    Ken
    not true. te and pe boats, or boats running in excess of 100mph are required to have a jetaway OR popoff. if you're going to run 7.99 or quicker, most rules require a popoff. you CAN race in rr, se, or me, or if max speed is less than 100.

    still, for a lake/river deal i'd go with a jetaway. they function instantaneously. popoff doesn't. if you plan on putting 1400-1500hp to it and running 120-130, you should also consider a popoff for shutdown purposes. neither one comes with a guarantee you'll never get wet.

  11. #9
    Senior Member Woods 017's Avatar
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    I have raced and worked on boats both with and with out pop off valves and in my opinion they really are the only way to go when it comes to safety in a high speed jet. A jet-a-way may help some but at the end of the of day its the valve that has the most affect on a boat shutting down safely.

  12. #10
    Ralls Precision Machine Ballztech's Avatar
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    Default Pop off

    They look cool too. But I think both have there place.
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  13. #11
    Ain't Right Racin piston in the wind's Avatar
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    The keel and hardware have a lot 2 do with it. We have been runnin a Ervin Capps keel kicked a blower belt at 138 it just sat down no problem, 40 psi suction it's not a center steer 290# ish driver with just a jetaway. However we changed the hardware and was loading 80# it got a lil upset while landing it but not too bad but blew the beefed up clean out cover that was glued in 50' in the air at Ft. Worth.We are changin keel's over the winter wouldn't even concider not using a pop off. If u have the $$ run both !! This shit ain't as safe as most think it is (false sence of security from makin a bunch of passes and all was good. It just takes one bad one) We all put a bunch of time, $$ and heart into these rigs!! Do it right the first time and enjoy it for years or u can just hope for the best. I would run both on this "river boat" if the pop off will clear the transom if not make it fit.
    Last edited by piston in the wind; 12-16-2011 at 03:27 PM.

  14. #12
    Senior Member Fonz69's Avatar
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    I would go with the Jetaway everytime for sure

    My next boat will have one for sure, I liked it so much on my last Daytona I would never run a jet without one!

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    Senior Member hotbo's Avatar
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    i dont chime in much on these deals.

    but i have a river/lake boat

    i love my Jet away

    for the simple reason i can start my shit anytime i want and not damage the pump

    i had a engine blow last july (3rd time out in the new built winger)

    i wasnt going 100 plus but i could hear the ratchet working every step of the way

    im sold on them!!!

    if i was going extreme speeds i would want both and my new set-up(motor) i may have both?

    if i had to choose?money wise i would go Jet away first

    just me


    Travis
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    built by Scott Seastrom.

  16. #14
    Senior Member Woods 017's Avatar
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    Just out of curiosity how many people siding with a jet-a-way have used a pop off valve?

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