berkley help please
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berkley help please

  1. #1
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    Default berkley help please

    long story short, changed out a 350 to 400 sbc. went from a to a3 impeller and am not seeing any difference in performance, turned the a at 4000 turning the a3 at 4100. Problem is at the same time i put in a different grate, inducer, changed from a jc bowl to dominator bowl and a best nozzle.
    so far i have taken out the grate and ran it no difference , removed the inducer that got rid of some of the slip at take off but no change anywhere else.
    someone has to know if the dominator bowls just dont flow as good as the jc or if its the nozzle that sucks... any help would be appreciated. thanks

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    Boat Nut sleekcrafter's Avatar
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    If you have slip with "A" or better impeller.... you have clearance issues in the pump.
    The AAA is way to big of an impeller for the small block, don't expect any more Rpm's because the small block is out side of it's capable torque/hp power range for the impeller.
    Upper Midwest Power Boat Association
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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by julio View Post
    long story short, changed out a 350 to 400 sbc. went from a to a3 impeller and am not seeing any difference in performance, turned the a at 4000 turning the a3 at 4100. Problem is at the same time i put in a different grate, inducer, changed from a jc bowl to dominator bowl and a best nozzle.
    so far i have taken out the grate and ran it no difference , removed the inducer that got rid of some of the slip at take off but no change anywhere else.
    someone has to know if the dominator bowls just dont flow as good as the jc or if its the nozzle that sucks... any help would be appreciated. thanks
    Just curious what and where the previous 350 and the new 400 had and made power and what prompted you to use an a3 and add an inducer? also you didn't say what hull (typew weight size) and what the useage was more info maybe would help ? Tom

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    Senior Member DuaneHTP's Avatar
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    I agree with Sleek. You've got something bad wrong. Your numbers don't add up, and like Tom said. Tell us more about your boat, your set up and what your available HP is at what RPM. Tell us a about your 400 motor, cam specs, heads, carbutetion , exhaust, etc. Not trying to be a smart a, but is there any chance that the inducer was in backwards or that the spacer was in front of the inducer instead of beind it?? Just trying to help.
    Duane HTP
    Last edited by DuaneHTP; 06-04-2011 at 11:18 AM.

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    Default info

    I didnt say what kinda boat because it is an alluminum river boat. not really what this site is known for but there is tons of info on here and to be honest the best place for info on berk style pumps
    so the boat is 21' and weighs around 4000 full o gas and gear. The inducer was to help load the pump in white water, it was installed correct with the spacer behind it
    I did the 400 to get some more go without more weight, engine is 9.7 comp. 202/160 heads 190cc intake runners, edlebrock performer intake and carb, comp cam in. 480 ex. 489, duration 226 and 236, lobe seperation 112. headers are center dump wet manifolds. i didnt have it dynoed so true out put of the motor is not available.
    the aaa is to keep it cruisable around the lake and I had it so it seemed a good place to start not knowing what i would need for the motor, its not a racer by any means.

    mostly was wondering if i was better off with my old jc bowl and nozzle even though its beat up over the dominator bowl and best nozzle. i also have a berk split bowl I could run. thanks for any help

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by julio View Post
    I didnt say what kinda boat because it is an alluminum river boat. not really what this site is known for but there is tons of info on here and to be honest the best place for info on berk style pumps
    so the boat is 21' and weighs around 4000 full o gas and gear. The inducer was to help load the pump in white water, it was installed correct with the spacer behind it
    I did the 400 to get some more go without more weight, engine is 9.7 comp. 202/160 heads 190cc intake runners, edlebrock performer intake and carb, comp cam in. 480 ex. 489, duration 226 and 236, lobe seperation 112. headers are center dump wet manifolds. i didnt have it dynoed so true out put of the motor is not available.
    the aaa is to keep it cruisable around the lake and I had it so it seemed a good place to start not knowing what i would need for the motor, its not a racer by any means.

    mostly was wondering if i was better off with my old jc bowl and nozzle even though its beat up over the dominator bowl and best nozzle. i also have a berk split bowl I could run. thanks for any help
    Got a hunch that your not going to see much of a difference with any of those bowl choices , but just reading down the middle of your build suspect a much smaller impeller (AB or B) will give you a better overall performance just my 02 Tom

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    Senior Member GA Jet's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Got a hunch that your not going to see much of a difference with any of those bowl choices , but just reading down the middle of your build suspect a much smaller impeller (AB or B) will give you a better overall performance just my 02 Tom
    Im with Tom here, you'll notice way more change from changing impellers or adding horsepower. The bowl changing I feel would be such a miniscule change in performance that you probably wouldnt be able to notice it any. I may have missed it in your description, but have you tried adding a loader?

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    Quote Originally Posted by GA Jet View Post
    Im with Tom here, you'll notice way more change from changing impellers or adding horsepower. The bowl changing I feel would be such a miniscule change in performance that you probably wouldnt be able to notice it any. I may have missed it in your description, but have you tried adding a loader?
    Loaders are not an option, anything below the bottom of the boat will likely get removed by a rock. I know dropping impeller size would get me more rpms and speed, maybe i am not understanding how the pumps work exactly but it seemed if I could turn the 3 the same rpm as the 1 my cruise rpm would go down and top speed should go up?

    -this whole mess is because i added horsepower, according to the impeller selection guide I added 100 hp.
    Last edited by julio; 06-05-2011 at 10:46 PM. Reason: more info

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    so I just had an epifany (sp?) the impellers all move the same amount of water per turn a larger impeller gets you more presure at a given rpm. The presure change is not enuff to effect a change for cruise or top speed, I need more volume to push my chubby boat.?

    does that sound rite

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    Senior Member GA Jet's Avatar
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    With a larger impeller your RPMs should drop, the impeller size vs horsepower is what controls your max RPM in a jet boat. So with this larger impeller you should be getting more speed at a lower RPM but to spin the A3 faster youll need more power. I know that is obvious but im just typing through what im thinking

    I think one of the big limiters on your boat will be the hull design, some hulls will only got so fast and it will take TONS of horsepower to effect that hull's top speed. So for example if you are at the hull's top speed so then you could add 200hp and maybe not even gain another 5mph because of the hull design.

    What about a place diveter? Can you air your boat out a little more?

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    could do a place diverter but you dont see many on river boats. dont know why? lost me with the air the boat out a bit? would be less to mess with to put a wedge in but would probably not work near a well... thanks again for the input.

  14. #12
    Senior Member GA Jet's Avatar
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    Quote Originally Posted by julio View Post
    could do a place diverter but you dont see many on river boats. dont know why? lost me with the air the boat out a bit? would be less to mess with to put a wedge in but would probably not work near a well... thanks again for the input.

    wedges would do the trick.

    the boat in the link below is a perfect example of being "aired out" The goal is to have less hull in the water. With that said I am not sure if that would work well for a river boat. You might want to try contacting a river racing team and see if they would be will to chat some.

    http://www.performanceboats.com/jet-...ml#post1426468

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    will try that, actually on an alluminum boat you can bend the last inch or so of the bottom of the boat where it hangs past the transom and affect that as well. I take it I would be wedging the pump up not down.. thanks again.

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    "Mad" Member Jet Mad's Avatar
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    Julio,

    My friend replaced his 455 Olds with a 383 Stroker SBC. We are spinning a Berk "A" 4500 RPM in a Kona 12JC pump.

    Just a couple of questions.

    1. Are the 2 fins on the intake (Bottom) still there.
    2. The impeller "AAA" is it SS.
    3. Do you have a rock/weed screen on at the moment.
    4. Are you using the boat in sand bottom or rock bottom river.

    Wikus


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