Defective sand cast aluminum impellers
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Defective sand cast aluminum impellers

  1. #1
    ATM
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    Default Defective sand cast aluminum impellers

    DEFECTIVE SAND CAST ALUMINUM IMPELLERS!... Not American Turbine ours are investment cast aluminum.

    I got a call yesterday asking me about what is the minimum thickness at the wear ring skirt. I told him that for a sand cast impeller it should be at least .150" because the sand casting technique causes porosity and therefore the casting is not as strong as investment (lost wax) casting. When you use sand cast molds the molten metal hits the sand mold and generates a lot of gas and because the impeller has a lot of thin walls the gas cannot escape before the metal freezes.

    The investment casting process creates a much denser metal therefore a stronger casting. The caller also said the wear ring skirt was only 1.0" long I told him the machinist probably didn't have much experience doing jet pump impellers. With only 1" long skirt you lose .060" of sealing surface.
    I told him that the probable reason that the skirt was so short was that if they were machined [U]properly/U] that they would have been thinner maybe even cut through.

    He said the impeller was cheap and that he had a "Joe Six Pack" pocket book I told him yes that I had been "there" and I would try to help him out (sometimes we have impellers that are cosmetic defects) and maybe we could find him a deal on a sturdy impeller. I hope he calls back, he was on a cell phone and the call dropped before I could get his name.
    Ron
    Last edited by ATM; 03-24-2012 at 11:28 PM.

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  3. #2
    ATM
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    Default Thin cast aluminum impellers

    I have received serveral PM's about the advantages to Investment cast impellers over sand cast ones. I can post more information Monday.
    Ron

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    ATM
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    Default Impeller Tooling

    Just to follow up; the thin wear ring skirt is not only a machining issue but a tooling one as well. The tooling (molds, patterns, and core boxes) dictates what the I.D. of the impeller will be, if it is too large you will have a thin wear ring skirt.
    Ron

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    Senior Member PCE680's Avatar
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    Default

    All aircraft cast alum parts are investment castings.

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    Senior Member bp298's Avatar
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    things that make you go hhhmmmmmm...

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    ATM
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    Default Investment casting

    Quote Originally Posted by PCE680 View Post
    All aircraft cast alum parts are investment castings.
    We are looking into investment tooling for our bowl, very expensive.
    Ron

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  9. #7
    ATM
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    Default Sand cast aluminum impeller

    Quote Originally Posted by ATM View Post
    Just to follow up; the thin wear ring skirt is not only a machining issue but a tooling one as well. The tooling (molds, patterns, and core boxes) dictates what the I.D. of the impeller will be, if it is too large you will have a thin wear ring skirt.
    Ron
    Upon further inspection the thin skirt was not a machining issue but a tooling problem. Tomorrow I will follow up.
    Ron

    One less DEALER means more DISCOUNT for you

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    ATM
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    Default Impeller section

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    Quote Originally Posted by ATM View Post

    Upon further inspection the thin skirt was not a machining issue but a tooling problem. Tomorrow I will follow up.
    Ron
    We cut up the impeller today. The photo describes the problem, it was not a machining issue but a tooling problem. The impellers can be identified by measuring the inside diameter on the inlet side if it measures 7.00 inches or more then it will be too thin. If you take the outside diameter of the wear ring skirt which should be 7.225-7.220 inches and subtract the inside diameter of 7.00" then you will have a wall thickness of 0.1125" which is too thin for a sand cast impeller. The one we measured was actually 0.089" thick.
    Ron

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  11. #9
    CAPTAIN KRYLON
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    Is this you version of a public service announcement?

    Why not let your competitor handle their own quality control issues?

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    Senior Member wolfie's Avatar
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    Wasn't there a thread on this a while back???
    http://www.performanceboats.com/jet-...ler-issue.html
    Last edited by wolfie; 03-27-2012 at 04:57 PM.

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    Senior Member wolfie's Avatar
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    Quote Originally Posted by TAYLORSS View Post
    Is this you version of a public service announcement?

    Why not let your competitor handle their own quality control issues?

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    Default Go JBP GO!!!!

    Quote Originally Posted by wolfie View Post
    oh and your favorite parts guy isnt the KING of that on this board?? I'm sure if he sold sand in AZ you'd be the first to buy it! ATM has some great info here and your busting his balls? have a little respect for the jet manufacturers when they post will ya. Still think he needs to finish making his own diverter and put place in their PLACE and put competition where it really needs to be after 30 years of "mercruisin" the market. Just sayin.
    matter of fact, who is this "manufacturer" of these inferior impellers anyone know??

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    Senior Member wolfie's Avatar
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    Quote Originally Posted by Spiritof76Cobra View Post
    oh and your favorite parts guy isnt the KING of that on this board?? I'm sure if he sold sand in AZ you'd be the first to buy it! ATM has some great info here and your busting his balls? have a little respect for the jet manufacturers when they post will ya. Still think he needs to finish making his own diverter and put place in their PLACE and put competition where it really needs to be after 30 years of "mercruisin" the market. Just sayin.
    matter of fact, who is this "manufacturer" of these inferior impellers anyone know??
    Go away you nut swinging troll!!! If you don't like the Place family then don't buy from them. Make your own shit.

    Since you only have 23 posts, why do you care or are you using two screen names because you don't want anyone to know who you really are? Who are you pimping for?
    Last edited by wolfie; 03-27-2012 at 10:51 PM.

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    i dont know what YOUR PROBLEM is but this is a GOOD THREAD about defective impellers
    The ATM is nice enough to enlighten us and is a real manufacturer that deserves a little respect ESPECIALLY from a guy like you. You THINK being a regular "nut swinging" poster here
    with 3500 posts you have the "clout" to ruin a good thread being an ASSHOLE!
    if anyone, i mean ANYONE is a sly, shrewd, stretch the rules kinda SPAMMER it's your favorite
    parts guy. How he gets away with it is beyond me. He has his own deal in another area, why doesnt he go there????????????????????????????????? and be the "stand up" kinda guy he is so highly regarded of by guys like you?
    anyways, sorry for the thread highjack ATM man. good stuff. carry on.
    just sayin.

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