How Much HP have you run through Alum. A Impeller?

[LakesOnly]

I'm talking about a cast aluminum "A" impeller. How much HP have you run without scattering it? And if so, how much HP scattered it?
I am about finished rebuilding my motor and expect about 550 HP. I refrained from installing a bigger camshaft until my pump is built to take more horsepower. Can my aluminum "A" impeller handle the load of 550 HP?
I'm running a Dominator Pump. The impeller charts seem very conservative to me (as far as rating how much HP a given impeller can handle). Maybe this is for liability reasons?
LO

[Clown]

I have run an "b" aluminum impellor
Ran it for about two years
On a motor with 650 H.P.
And a pump that was not setup correctley
"Had lot's of cavation Problems"
And it never let loose on me
But when I rebuilt the pump
I did notice hair line cracks starting to form
where the vane meets the o.d.
So It life in your own hands
Don't listen to ME! :confused:

[Jungle Boy]

550 hp is alright if you are not coming out of the water too much. It's the loading and unloading that will damage the impeller. :cool:

[HammerDown]

Jungle Boy:
550 hp is alright if you are not coming out of the water too much. It's the loading and unloading that will damage the impeller. :cool: Good point!

[LakesOnly]

Jungle Boy:
550 hp is alright if you are not coming out of the water too much. It's the loading and unloading that will damage the impeller. :cool: Yeah, that is a good point...very true. The blink-of-an-eye onset of load can cause the vanes to give.
Still, how about sheer horsepower? How much have any of you "proofed" your impellers to?
LO

[Jungle Boy]

LakesOnly:
Jungle Boy:
550 hp is alright if you are not coming out of the water too much. It's the loading and unloading that will damage the impeller. :cool: Yeah, that is a good point...very true. The blink-of-an-eye onset of load can cause the vanes to give.
Still, how about sheer horsepower? How much have any of you "proofed" your impellers to?
LO I have ran steel impellers now for several years. We tend to be fairly rough on impellers (gravel bars, sticks and loading pressure). I have had to repair a few steel ones though after a few runs in rough water. I found it was cheaper in the long run to buy a couple of steel ones than to keep buying aluminum impellers after they could not be sharpened anymore. We usually have a good impeller for the better rivers and a beater impeller for the rips up the Upper Red Deer River. It's the fun river, but hard on equipment!! :D
JB
[ March 19, 2003, 06:00 AM: Message edited by: Jungle Boy ]

[Blown 472]

I have a blown 472 inch ford, with 9 psi, hp not sure but I am running a alum imp and was told as long as it doesn't get loaded and unloaded it will be fine.

[LakesOnly]

Blown 472:
I have a blown 472 inch ford, with 9 psi, hp not sure but I am running a alum imp and was told as long as it doesn't get loaded and unloaded it will be fine. Well, that puts my concerns to rest.
Thanks everyone.
LO

[sanger mike]

so does that mean you WILL put the cam in NOW. you KING WINGNUT. :p :p :p