Impeller Questions
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Impeller Questions

  1. #1
    Led
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    Default Impeller Questions

    What is the benefit of stainless over bronze or aluminum, I have heard about every story, he ran this and that, he broke this and that, etc. Little help with the facts.

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    "BOATLESS" blender over's Avatar
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    Quote Originally Posted by Led View Post
    What is the benefit of stainless over bronze or aluminum, I have heard about every story, he ran this and that, he broke this and that, etc. Little help with the facts.
    All i know is if you have bigger power, 600plus you want a bronze or stainless.
    If you unload-then load you pump on the gas with a aluminum you going to have problems..

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    that what I understood too, but why? what is it about the aluminum and the stainless, I know in the outboard world aluminum flex, but i wouldnt think so with an impeller.

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    I was always told strength, flex and durability. Aluminum is the weakest and can flex and shatter when adding more than modest hp as stated above. Bronze is stronger than aluminum, less expensive than SS, but will wear out quick if your running in sandy, rocky conditions (river). SS is very strong, has very good wear characteristics, will hold the hp, but can be pricey.

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    Ain't Right Racin piston in the wind's Avatar
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    Just lift an alum. up and then the stainless. You will understand why its stronger

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    Quote Originally Posted by Led View Post
    that what I understood too, but why? what is it about the aluminum and the stainless, I know in the outboard world aluminum flex, but i wouldnt think so with an impeller.
    It's really simple if your at 600 or more HP your can shatter an aluminum impeller, same goes for your pump shaft, it's only going to hold up to a certain point and then twist the splines. Do yourself a favor and get the right parts if your in this situation. Depending on how you drive your Boat, I'd say do the shaft first if it's all u can afford.

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    Because they are "cast" LED

    Not made from solid material that can be rolled or density increased in some way.
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    if your going to run a chevy, you'll be fine with aluminum.

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    real funny dave, I have a stainless on the way. Thank you guys!

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    B1 Racing cs19's Avatar
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    Watch the stock shaft too it won't last with any real HP. You can wipeout out the thrust in your engine if you twist it bad.

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    Quote Originally Posted by cs19 View Post
    Watch the stock shaft too it won't last with any real HP. You can wipeout out the thrust in your engine if you twist it bad.
    Chris does a AT pump stock already has the stronger upgraded shaft?

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    have the shaft tested to see if it is one of the better shafts, would be a good idea to have it checked to see if it is straight, will save you a lot of problems in the future, most of the better shafts 17-4 family will be magnetic, the 304 stainless generally is not. i recall that a.t. offered the 17-4 shaft as an option some years back and now the better shaft is standard, ronnie at a.t. should be able to tell from the serial number what it "came" out with. if you are not the original owner he wont know if somebody has changed it.

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    Quote Originally Posted by johnray069 View Post
    have the shaft tested to see if it is one of the better shafts, would be a good idea to have it checked to see if it is straight, will save you a lot of problems in the future, most of the better shafts 17-4 family will be magnetic, the 304 stainless generally is not. i recall that a.t. offered the 17-4 shaft as an option some years back and now the better shaft is standard, ronnie at a.t. should be able to tell from the serial number what it "came" out with. if you are not the original owner he wont know if somebody has changed it.
    I believe that some of the early "standard" AT shafts were 416, which is also magnetic.

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    B1 Racing cs19's Avatar
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    Quote Originally Posted by blender over View Post
    Chris does a AT pump stock already has the stronger upgraded shaft?
    All shafts from AMT are currently 17-4. They did make some other stuff n the past, check for magnetism, also check for rust, there was a small run of magnetic shafts that were a low grade of stainless, most of those are rusty in appearance but magnetic..I dont know what kind of power those can handle.

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