Ideas on ny BBC build for My 19' Daytona Eliminator
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Ideas on ny BBC build for My 19' Daytona Eliminator

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    Senior Member Flyin-Bryan's Avatar
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    Default Ideas on ny BBC build for My 19' Daytona Eliminator

    I will be putting something together and was hoping You guy can point Me in the right direction,I am building a 454 for My Daytona it now has an "A" impeller with no snoot or place diverter,and need Ideas on what my hp goals should be,I can install the snoot and diverter as well ,I have a nice set of ported and polished 990's here,a couple big blocks to work with and also a new Weiand 871,any help with cam selection ect. will be appreciated,thanks in advance,My goal is to go as fast as I can with what I have.

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    Senior Member Flyin-Bryan's Avatar
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    111 views and nothing?Is this in the wrong section?

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by Flyin-Bryan View Post
    111 views and nothing?Is this in the wrong section?
    How about some more information from you? Will it be a river racer,, or plan to race it? Do you plan on buying a new rotating assembly, or have a good crankshaft already? What speed and RPM do you want to run? Are you planning on running pump gasoline?

    Camshaft selection will be one of the last things on the list.

    You may need to plan on cutting down or replacing the impeller to get the engine to run in the RPM you want and/or design it to run in.

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    Senior Member Flyin-Bryan's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    How about some more information from you? Will it be a river racer,, or plan to race it? Do you plan on buying a new rotating assembly, or have a good crankshaft already? What speed and RPM do you want to run? Are you planning on running pump gasoline?

    Camshaft selection will be one of the last things on the list.

    You may need to plan on cutting down or replacing the impeller to get the engine to run in the RPM you want and/or design it to run in.

    1: Pleasure Boat
    2:Have steel cranks with forged pistons,Stock GM crank with dimple 7/16 rods
    3:Speed,as fast as I can go with what I have
    4:RPM is not known,I am looking for help with that
    5:Pump Gas

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    Default Limiting factor...

    Quote Originally Posted by Flyin-Bryan View Post
    1: Pleasure Boat
    2:Have steel cranks with forged pistons,Stock GM crank with dimple 7/16 rods
    3:Speed,as fast as I can go with what I have
    4:RPM is not known,I am looking for help with that
    5:Pump Gas
    Your inquiry is pretty wide open... The limiting RPM factor will be which impeller you choose to use, and how "dry" you can get the hull... The "A" is not really a BBC first choice. They work quite well behind a mild BBO 455, but the BBC would likely work better with a blend between a B and a C.... Those 7/16ths factory rods are butt heavy for your application... You might be better off with some 3/8ths rods and ARP bolts, and some aftermarket pistons. Remember, lighter is better in rotating mass, and especially in reciprocating mass... Be prepared to fail, fail miserably.... A jet boat is about the toughest thing you can ask an engine to do. Spend your money wisely on a good 10/12qt pan, the best oil pump, a through balance, and enough compression to make power without getting into the "race gas" category.... AND, please, don't let anyone talk you into a t/ram with dual 750DP carbs... Keep the carb as small as logical based on true MATH requirements, on a quality dual plane intake....Learn how to curve the timing to your application, and if you're using over the top headers be careful with your water flow to prevent reversion... Cam, about .560-.590 net lift, and about 280-290* advertized, with matching valve springs....Keep the valve train simple, those stocker stamped rockers will work just fine....5/16ths pushrods work well with Hyd springs, so don't go nuts with heavier than necessary pushrods...
    Bottom line is to remember what the "Pleasure" in Pleasure boat means....
    Good luck, Ray

    .
    LOUD BOATS SAVE LIVES

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by Flyin-Bryan View Post
    1: Pleasure Boat
    2:Have steel cranks with forged pistons,Stock GM crank with dimple 7/16 rods
    3:Speed,as fast as I can go with what I have
    4:RPM is not known,I am looking for help with that
    5:Pump Gas
    OK,, not sure what pistons you have, and whether you have a block that will finish at the proper bore to go with, here's a pump gas, single carb engine I did awhile back that made 617 HP with 990 heads and a roller cam.

    http://www.performanceboats.com/dyno...dyno-test.html

    But the way I was reading your post, you have an 8-71 blower that you want to bolt on, probably will need some flat top or small dished forged pistons.

    I would definitely run the 7/16" bolt rods if you have them, and I never run 5/16" pushrods in any big block Chevy that I build.

    As I said above, cam selection last,, decide what you are doing first. Blower will want a completely different cam than the NA engine.

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    Senior Member Flyin-Bryan's Avatar
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    Quote Originally Posted by Moneypit View Post
    Your inquiry is pretty wide open... The limiting RPM factor will be which impeller you choose to use, and how "dry" you can get the hull... The "A" is not really a BBC first choice. They work quite well behind a mild BBO 455, but the BBC would likely work better with a blend between a B and a C.... Those 7/16ths factory rods are butt heavy for your application... You might be better off with some 3/8ths rods and ARP bolts, and some aftermarket pistons. Remember, lighter is better in rotating mass, and especially in reciprocating mass... Be prepared to fail, fail miserably.... A jet boat is about the toughest thing you can ask an engine to do. Spend your money wisely on a good 10/12qt pan, the best oil pump, a through balance, and enough compression to make power without getting into the "race gas" category.... AND, please, don't let anyone talk you into a t/ram with dual 750DP carbs... Keep the carb as small as logical based on true MATH requirements, on a quality dual plane intake....Learn how to curve the timing to your application, and if you're using over the top headers be careful with your water flow to prevent reversion... Cam, about .560-.590 net lift, and about 280-290* advertized, with matching valve springs....Keep the valve train simple, those stocker stamped rockers will work just fine....5/16ths pushrods work well with Hyd springs, so don't go nuts with heavier than necessary pushrods...
    Bottom line is to remember what the "Pleasure" in Pleasure boat means....
    Good luck, Ray

    .

    Thank you for your help,I thought the T/ram was standard on these,I also have Twisty headers with this,getting a different impeller is fine with Me,I am just looking for h.p. ideas for this boat with where the fun stops and the pain begins How fast is fast with this hull with what H.p.?I would think 600 isn't out of reach,is it?

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    Senior Member H20MOFO's Avatar
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    A pic or 2 would be a bonus. Does it have a flat keel?
    Another Hot Boat refugee

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    Senior Member Flyin-Bryan's Avatar
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    Quote Originally Posted by H20MOFO View Post
    A pic or 2 would be a bonus. Does it have a flat keel?
    The boat is a '79 so from my research I guess it is?

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    Senior Member Flyin-Bryan's Avatar
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    Quote Originally Posted by H20MOFO View Post
    A pic or 2 would be a bonus. Does it have a flat keel?
    Pics. are in this link;http://www.performanceboats.com/boat...very-nice.html
    Last edited by Flyin-Bryan; 11-25-2011 at 05:00 PM.

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    Senior Member Boat 405's Avatar
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    A well set up 19' in the 500 to 700 lb range will run 100 plus with 700 - 750. If you have a flat keel that will be an issue, if you have a rounded keel you should be able to get it close.

    A good detailed pump, correct hardware set up and limited interior, like a fiberglass bucket or two.
    Boat 405.

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    Default Works fine....

    Quote Originally Posted by obnoxious001 View Post
    I would definitely run the 7/16" bolt rods if you have them, and I never run 5/16" pushrods in any big block Chevy that I build.
    Sure, they'll work, but those rods are way heavy for a NA, hyd cam, pleasure boat engine...If the blower is truly in the future, then the whole thread changes...I've built 5 BBC MK IV engines for "pleasure Jets", all 5 are still running strong, years later... The 5/16ths push rods have never failed to perform well with hyd lifter springs.... Lighter is always better, unless heavier is necessary, and in this NA application, the heavier 7/16ths rods are not necessary if the 3/8ths rods are re sized using ARP bolts...Over building seldom hurts, and for some applications it is necessary, but in other applications hauling around extra weight in the bottom end, or the valvetrain, can lead to failures.. I'll put my 1980 something built 402 against any BBC jet while running dam to dam at Parker, wide open, pedal mashed all the way, to the Bluewater bouys... I've done it several times and watched others scatter their engines less than 1/2 way.... Same at Bullhead, Davis Camp, as far south as you want, wide flat open...... Sure, it maxes out about 5600, but it'll run 5600 all day.... Heavier internal parts will try to find their way out, and usually do... Once you mention blower, or race, it all changes, but he did say "pleasure boat".....
    Ray
    LOUD BOATS SAVE LIVES

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    Senior Member Flyin-Bryan's Avatar
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    My question is also what do I need to run as fast as I can with this hull before the fun is gone,I have been boating for 20+ years and have my share of problems,with that said this is my first jet boat,and want to know what is my best bet with what I have,either blown or n/a,thanks again guys.

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by Flyin-Bryan View Post
    My question is also what do I need to run as fast as I can with this hull before the fun is gone,I have been boating for 20+ years and have my share of problems,with that said this is my first jet boat,and want to know what is my best bet with what I have,either blown or n/a,thanks again guys.
    If it doesn't have a round keel....you may want to start there. I dont know the magic number where the flat stops working/loading well.....I kinda remember a couple of the guys getting em in the upper 80's....but dont quote me on that.
    Another Hot Boat refugee

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