What impeller???
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What impeller???

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    Senior Member UNASHAMED's Avatar
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    Default What impeller???

    I have a TX20, very light hull. An honest 550-600 hp bbf, dominator pump. Right now it turns 5500. What impeller should I be running? I have no idea whats in it now. Any info would be great thanks.
    "Don't make me get my penguin"

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    Senior Member GT Jets's Avatar
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    Quote Originally Posted by UNASHAMED View Post
    I have a TX20, very light hull. An honest 550-600 hp bbf, dominator pump. Right now it turns 5500. What impeller should I be running? I have no idea whats in it now. Any info would be great thanks.

    In all honesty, very tuff to answer if you don't know what's in it now, IMHO I would say a stainless A with some work..

    GT
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    Senior Member tx-19's Avatar
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    i would say an a/b cut.

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    Senior Member Need4Speed77's Avatar
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    Quote Originally Posted by UNASHAMED View Post
    I have a TX20, very light hull. An honest 550-600 hp bbf, dominator pump. Right now it turns 5500. What impeller should I be running? I have no idea whats in it now. Any info would be great thanks.
    Start with an A and then go from there. If you turn less rpm then have it cut to an A/B, then to a B and so on. It is a trail and error thing. What works for me may not work for you and what works for Joe may not work for John even though we all have similar set up.

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    Renegade jet tunneljet's Avatar
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    Depends on the power curve of the engine. Where does the motor make peak power? If it makes peak power at 5500 then you are good. If it makes peak power at 6500 you might want to have the impeller cut down.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by UNASHAMED View Post
    I have a TX20, very light hull. An honest 550-600 hp bbf, dominator pump. Right now it turns 5500. What impeller should I be running? I have no idea whats in it now. Any info would be great thanks.
    A lot more info about the motor and where you belive it "makes power" would be helpful Tom

  9. #7
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by tunneljet View Post
    Depends on the power curve of the engine. Where does the motor make peak power? If it makes peak power at 5500 then you are good. If it makes peak power at 6500 you might want to have the impeller cut down.
    Exactly.

    You need the cut that allows your engine to spin to it's maximum HP, not more or less.

    Now, that means you need to know at what rpm your engine makes max. power.
    Last edited by SmokinLowriderSS; 03-01-2009 at 08:17 PM. Reason: what
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    I'm No Expert Shaun's Avatar
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    Depends on a couple things. Your motors power curve is one like what was previously said.. But also what your doing with the boat. If your doing alot of cruising and towing you dont want to go cutting that impeller too much. Your going to raise your cruise/tow rpms and put extra wear on the motor for nothing. Get some numbers of what your running now, pull what you have and get it worked, then get some numbers of how things changed.

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    Senior Member UNASHAMED's Avatar
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    Maybe I shoulda dyno'd the damn thing when I had it out. 80 over 460, 13.5 to 1, decked block, heads have been cut, cobra jet heads, 760 full roller, portmatched tunnel ram, duel 750's, all msd ign. This motor went 91 my very heavy kachina but only 80 in this boat so I was kind like wtf??
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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by UNASHAMED View Post
    Maybe I shoulda dyno'd the damn thing when I had it out. 80 over 460, 13.5 to 1, decked block, heads have been cut, cobra jet heads, 760 full roller, portmatched tunnel ram, duel 750's, all msd ign. This motor went 91 my very heavy kachina but only 80 in this boat so I was kind like wtf??
    If those are the specs and you're looking for mph I'd turn it at least 6,250 maybe even 6,400 on the far end 6,600. But to be able to cruise without killing the thing with rev's I'd go for 6,250 to start with, maybe an A/B cut to start with.

    If that engine is tuned I'd guess it would make 625-650ish hp. Who's cam and what are the spec's ? It would more than likely turn your typical "b" cut impeller 6,200. Start with an A/B it will probably be around 6,000 see what it does and go from there. You can always trim more off, you can't add it back.

    My best guess if you only want to have it a part once it could use a "B" without any problem, but I'd stay on the conservative side and do an A/B first.

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  13. #11
    Spiral out MikeF's Avatar
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    Take the pump out of the Kachina and put it in the TX!

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    Quote Originally Posted by UNASHAMED View Post
    I have a TX20, very light hull. An honest 550-600 hp bbf, dominator pump. Right now it turns 5500. What impeller should I be running? I have no idea whats in it now. Any info would be great thanks.
    Find out who Impeller(Each IMpeller has its own flow rate) What Cut, Large Dia stock is 9.0x7.25 is a "A" cut, 8.75 Lrg. Dia is a "B" and so on.
    Then what Rs are you wanting to turn it at.

    A Full cut = around 400 Rs ("A" cut to a "B") You should know as much about your pump as you do your motor!

    50 answers, as to which one to run, or whos impeller is best, Just remember you get 1 shot at a cut unless you under cut to fit the bill. The above size should help you understand your start point. Then @ what point do you make peak power gives you your second point. Then are you Race only or want a sound everyday. 3-4 MPH Diff.
    Yet you save the motor and fuel. 5500 sounds like a good start point. Then is the pump good on tolerance
    Wear Ring to Impeller. Stock is .0125 per side. Dont go beyound .010. Is the packing good, Bearing and so on.

    Enjoy!

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    Senior Member UNASHAMED's Avatar
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    It has a stainless a/b in it now. My lod boat had a b. Maybe I'll pop in a b and see what happens.
    "Don't make me get my penguin"

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    Quote Originally Posted by UNASHAMED View Post
    It has a stainless a/b in it now. My lod boat had a b. Maybe I'll pop in a b and see what happens.
    General rule say's it should jump 200 Rs... unless one is Aggressor then deduct 400 Rs off the base for the Aggressor. Are you looking for a 5800 number or what... Remember the bigger cut to the Impeller the less frontal draft or launch (Due to the larger exit port size) Pre-Loader in a little less problem. If you got a good bottom you don't need to worry.

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