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Thread: Bronze Impeller ?

  1. #1
    Taylorman
    I just bought this bronze aggressor impeller off ebay. It is a C and the seller said it was race detailed by Tom Papp. It has one spot that has a pit in it. I tried to take a good picture of it but this is the best I could do. Is this normal for impellers to pit like this. My alum impeller I have now has pits but I did not expect a bronze to do the same. Will these pits have any affect on performance? [img]http://free.***boat.net/ubb/Avatars/Reader_Rides/Jet_Boats/DCP_1858.JPG[/img]
    [img]http://free.***boat.net/ubb/Avatars/Reader_Rides/Jet_Boats/DCP_1854.JPG[/img]
    [img]http://free.***boat.net/ubb/Avatars/Reader_Rides/Jet_Boats/DCP_1852.JPG[/img]

  2. #2
    Jungle Boy
    Can't comment on the pits, but just how high are you planning to spin that 455ci engine with a "C".

  3. #3
    Duane HTP
    That's pretty common with bronze impellers regardless of manufacture. Probably will never cause any kind of problem of any kind.

  4. #4
    Taylorman
    Since they tell me an aggressor C is like a Berkeley B, I figure I will get a couple hundred more rpms. I have a Berkeley AB now and Im turning 4800. Im shooting for 5000.

  5. #5
    Taylorman
    Thanks for the reply guys. Duane, this impeller is coming to you soon for one of you wear rings.

  6. #6
    Taylorman
    One more question. When you go to a smaller impeller such as Im doing, do you loose some speed out of the hole? If so, will a impeller pre loader fix this and will the pre loader hurt you on top end?

  7. #7
    MikeF
    T, You won't lose speed as far as going to a smaller trim impeller "if" your engine can turn the new impeller to a higher rpm than you are currently turning the one you have. If your engine can do that, then you have the posibility of moving a little more water through the pump, hence, the higher speed.
    Important! When you cut the impeller smaller, you will lose efficiency. You might end up w/o a higher top speed and a higher rpm. It depends on how many more rpm you can get w/ your engine.
    [ February 09, 2003, 08:03 AM: Message edited by: MikeF ]

  8. #8
    XClutchboy725
    Taylorman:
    Since they tell me an aggressor C is like a Berkeley B, I figure I will get a couple hundred more rpms. I have a Berkeley AB now and Im turning 4800. Im shooting for 5000. Taylorman,
    FYI I have a mag-bronze Agressor A in my boat that has been turned down to a B. I turn it 5700 RPM's with about 600H.P. I'm concerned that you may be going a little too small!

  9. #9
    Taylorman
    I know I MAY be going to small. I just wanted to give it a try. If the B cut is to small, i will switch back. It was to good of a deal to pass up. I only paid $235 for the impeller.

  10. #10
    Wet Dream
    What have you done to the engine to address the higher revving?

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