How to go faster???
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How to go faster???

  1. #1
    jetboataholic HawaiianJet's Avatar
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    Question How to go faster???

    Ok for those that don't know I finally got my engine running like it should, but I am not satisfied with my top speed, 51.4 with my foot to the floor, it did this consistently all day long. Is there anything that I could do to the pump to pick up more speed? Or is it all just down to getting more horsepower out of the engine? For the very few who don't know my setup by now, I have a 19' Hawaiian hull w/ a 427 tall deck Chevy bored 0.060", flat top pistons, big oval port truck heads, Edelbrock dual plane intake, Holley DP 800 cfm w/ mechanical secondaries, 10 qt. oil pan w/ windage tray and baffles. All this turning a Berkeley 12JC with an AB impeller (possibly a Berk, no one has ever been able to give me a straight answer on the impeller make), bowl stuffer, stock rock grate, and I do have a new place diverter, hopefully I'll have an rpm for you guys by next week (thanks Sleek), damn tach don't work. I know I need a shoe and ride plate to get it up out of the water, and pick up some speed, I'm thinking about pulling the intake this winter and having it machined. I've been looking at split bowls a lot lately, does anyone know if a droop would help this boat any. And, is there anything else I should also do to pick up some speed, I'd like to at least get into the mid 60's, on a budget, if possible. If there's anything else you need to know, let me know and I should be able to tell you.

    Thanks.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

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  3. #2
    Senior Member Need4Speed77's Avatar
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    Quote Originally Posted by HawaiianJet View Post
    Ok for those that don't know I finally got my engine running like it should, but I am not satisfied with my top speed, 51.4 with my foot to the floor, it did this consistently all day long. Is there anything that I could do to the pump to pick up more speed? Or is it all just down to getting more horsepower out of the engine? For the very few who don't know my setup by now, I have a 19' Hawaiian hull w/ a 427 tall deck Chevy bored 0.060", flat top pistons, big oval port truck heads, Edelbrock dual plane intake, Holley DP 800 cfm w/ mechanical secondaries, 10 qt. oil pan w/ windage tray and baffles. All this turning a Berkeley 12JC with an AB impeller (possibly a Berk, no one has ever been able to give me a straight answer on the impeller make), bowl stuffer, stock rock grate, and I do have a new place diverter, hopefully I'll have an rpm for you guys by next week (thanks Sleek), damn tach don't work. I know I need a shoe and ride plate to get it up out of the water, and pick up some speed, I'm thinking about pulling the intake this winter and having it machined. I've been looking at split bowls a lot lately, does anyone know if a droop would help this boat any. And, is there anything else I should also do to pick up some speed, I'd like to at least get into the mid 60's, on a budget, if possible. If there's anything else you need to know, let me know and I should be able to tell you.

    Thanks.
    Put a snoot on it whether it be straight or snoot will depend on your hull. Go to a single plane intake and a 950 carb possibly with a spacer and you could pick up 5-10 mph. Have the bottom done. blueprint the pump. Port/polish the intake and heads. New cam, lifters and pushrods. There are an endless number of ways but there are just a few. Oh yeah and break out the wallet because it's not going to be cheap!!!

  4. #3
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    you sure the secondaries are opening?
    How about the timing, what's the total advance and where is it all in?
    a stock 454 will push that boat to 60+ pretty easily.

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    Senior Member koyota93's Avatar
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    Quote Originally Posted by guest View Post
    you sure the secondaries are opening?
    How about the timing, what's the total advance and where is it all in?
    a stock 454 will push that boat to 60+ pretty easily.
    I was thinking the same. I get mid 60s on mine with a fairly stock motor. Something seems wrong, I would think it would go faster for sure.

  7. #5
    jetboataholic HawaiianJet's Avatar
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    Quote Originally Posted by guest View Post
    you sure the secondaries are opening?
    How about the timing, what's the total advance and where is it all in?
    a stock 454 will push that boat to 60+ pretty easily.
    Yes, secondaries are opening, I watched em' move while somebody else was driving.

    That might be the problem, I need to get a good timing light and check that stuff. Then I'll get back to y'all.

    Thanks.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  8. #6
    Senior Member koyota93's Avatar
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    Less time typing, more time wrenching.

  9. #7
    Purple headed member Quickjet's Avatar
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    I would change the heads, install a real cam, and go with the single plane intake or tunnell ram setup. Don't throw the heads away though because they would make great boat anchors.
    I don't care what anyone says, oval port truck heads should be nowhere near an engine that is seeking horsepower or in a boat trying to reach the mid 60's.
    Look in the spam section, I think a couple sets of 990's are for sale.
    Quote Originally Posted by thatguy View Post
    I used to believe QJ was a gay black man..

    Quote Originally Posted by Havasu Secret View Post
    Keith...
    Real Fast Big Blocks are always V-Drives

  10. #8
    Senior Member Marcsrollin's Avatar
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    The only sure way to make any boat faster is to THROW MONEY AT IT!!!!
    No matter how good she looks , someone is tired of her shit!

  11. #9
    Senior Member LuckyDaze's Avatar
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    Sell it and buy a v-drive. Everybody knows they are the shiznit.


    Otherwise your gonna need some $$$.
    Last edited by LuckyDaze; 09-22-2008 at 11:55 PM.

  12. #10
    Sit N' Spin Jetaholic's Avatar
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    Quote Originally Posted by HawaiianJet View Post
    Ok for those that don't know I finally got my engine running like it should, but I am not satisfied with my top speed, 51.4 with my foot to the floor, it did this consistently all day long. Is there anything that I could do to the pump to pick up more speed? Or is it all just down to getting more horsepower out of the engine? For the very few who don't know my setup by now, I have a 19' Hawaiian hull w/ a 427 tall deck Chevy bored 0.060", flat top pistons, big oval port truck heads, Edelbrock dual plane intake, Holley DP 800 cfm w/ mechanical secondaries, 10 qt. oil pan w/ windage tray and baffles. All this turning a Berkeley 12JC with an AB impeller (possibly a Berk, no one has ever been able to give me a straight answer on the impeller make), bowl stuffer, stock rock grate, and I do have a new place diverter, hopefully I'll have an rpm for you guys by next week (thanks Sleek), damn tach don't work. I know I need a shoe and ride plate to get it up out of the water, and pick up some speed, I'm thinking about pulling the intake this winter and having it machined. I've been looking at split bowls a lot lately, does anyone know if a droop would help this boat any. And, is there anything else I should also do to pick up some speed, I'd like to at least get into the mid 60's, on a budget, if possible. If there's anything else you need to know, let me know and I should be able to tell you.

    Thanks.
    What is the casting number on those heads? If they are the peanut ports (small oval port, found on most trucks) they are not suited for anything above 4,000RPM or so. Down at low RPM they offer great air velocity for building bottom end torque, but start to run out of breath right around 4000-4500ish. Plus jet boat engines don't really need bottom end since the pump isn't really loading the motor right up until the peanut ports start to fall on their face. Get a set of large oval port, 353049 heads or something of that nature. '049's are very common on jet boats and perform really well. I had bigger valves installed in mine (2.19 intake/1.88 exhaust) so I'm not sure how well they perform with the stock valves, but it's very common to put larger valves in the '049's.

    Now I'm running a 454 (only difference between a 454 and 427 is the crank and pistons...454 is a 427 factory stroker) and with a White Lightning loader, stuffer and bronze shouldered wear ring I spin an AB impeller to 5400RPM with a pair of '049's and I'm very close to breaking 80mph. That's with an Aggressor droop w/2* down wedge and no shoe/ride plate.

    Better yet, drop a 454 crank and pistons in it.
    Last edited by Jetaholic; 09-23-2008 at 12:08 AM.



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  13. #11
    Senior Member CK7684's Avatar
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    RPM would be helpful...also, how did you record the speed? GPS?

  14. #12
    SLOW MEMBER slowboy's Avatar
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    It takes lots of time and effort to make a jet run fast. The guys that are running 100 plus, have spent lots of money and time to get the boats running like that.

    You dont need a split bowl, ride plate, or a droop to run fast. Just ask carlsonauto (jake). Its all about matching your parts, to work good together.

    I have all that crap on my boat, but dont know if it makes it run any better. Actually it runs smoother with out the shoe and ride plate on it.

    Does your set up have a pump loader? I know that I took mine out one day, and it ran terriable. Also, what kind of RPMs are you turning that AB?

    I just picked up a different pump loader, but have not had a chance to try it, as the weather has not been good.

    Ryan
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

  15. #13
    Senior Member Widetrack's Avatar
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    HJ don't you have a good pic. of your impeller post it so we can see the cut down! An A impeller will push more water(means faster speed) for that stock motor! Most of factory pumps came with A cuts with mild motors! If your motor is running good don't F with it! RPM is a must know to see what the pump is doing!(And also know what the motor has got!) Take some time and work all the bugs out first and enjoy! You will be glad you did! Then more speed will follow! WT


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

    WFL Crew!!!

  16. #14
    ....like warm apple pie RaceFace's Avatar
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    Once again, a pretty important thing with regards to speed.....FIX THAT HOOK IN THE BOTTOM!

    We've all seen your pics a million times and I can tell just by your bottom pics and the way that thing sits on the trailer, your bottom is a mess. Your trailer bunks dont extend past the transom so your hull does not have the correct support while sitting on the trailer....especially with the weight of a jet pump and a BBC sitting on it. Yes specific manufacturers build their boats with some degree of hook or rocker to make their design work, but not that much.

    Good luck!
    Race

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