A vs. AA in a stock application?
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A vs. AA in a stock application?

  1. #1
    Large Member edog's Avatar
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    Default A vs. AA in a stock application?

    I need to rebuild my pump this winter. I have a stock Chevy 454 in a Spectra 19. I was at the delta this week and put around a 150 mi on the boat. It got me thinking, should I put an A or AA in the pump? What are the pros and cons. Will my stock motor have enough torque and Hp to turn the AA past let say 3500 rpm? how much fuel will i save or not save. Will the AA help pull a skier out of the water? I am using the boat as a ski boat, and never plan on putting any more Hp then the stock motor.

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  3. #2
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    Just my .02. I do not know if one is available but a good start would to find what would be the equivalent of a dyno sheet for your engine. That way you could match the impellor curve to your engine. Do you know what impellor is in you pump now? What is the condition of your pump? What Rpm will you engine turn the setup you have now? If at WOT you are turning the exsiting setup 4,500 Rpm going to "AA" may not be good idea. I can say going to "AA" in my pump improved fuel consumption and dropped engine speed about 3-400 Rpm at same hull speed.
    Last edited by fastmarlene; 07-09-2012 at 01:18 PM.

  4. #3
    Large Member edog's Avatar
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    I have an A in it now. My pump is tired, hence the rebuild this winter. Totally stock Chevy 454, i'm sure i have the small heads. I was turning around 3,000 rpm cruising at 30 mph on the gps. I know my current impeller is beat up, takes a while to plane the boat off. A pump rebuild will be a huge improvement from what I have now. Im not sure what the trade off would be moving to a AA, and if it would be worth it. If going to a AA brings the rpm's down for cruising and plains the boats off faster i see it as an improvement, but if my motor can't turn it past lets say 3200 rpm's it might not be a good idea.

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    Senior Member Widetrack's Avatar
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    Just looking on a HP and TQ to RPM chart. Your 454 should make around 275-325 HP estimated by me, and should turn an A impeller 4300-4500 RPM at wide open! So with the same power with a AA in a tight pump wide open 4100-4300 RPM! All this is estimated!!!!!! but should give you some idea! Your cruise RPM will drop some! Lets say you cruise at 3000 RPM now just to keep the boat on plane, that may drop up to 300 RPM and still keep it on plane! Not all boats will do this just remember a AA can be cut down and an A can't be made bigger! FWIW!


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

  7. #5
    Boat Nut sleekcrafter's Avatar
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    IMO An "A" impeller in addition to an inducer, this will reduce any caviatation to none at all. A tighter pump makes all the difference in the world.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


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