what size impeller

[cyclone]

500lb tunnel hull
aluminum bbc on nitrous
1100 hp @6,800 rpm
set up for `1/8 mile sprints.
what size impeller would be best?

[Squirtin Thunder]

500lb tunnel hull
aluminum bbc on nitrous
1100 hp @6,800 rpm
set up for `1/8 mile sprints.
what size impeller would be best?
MPD A2 Berk with inducer also by MPD !!!

[steelcomp]

500lb tunnel hull
aluminum bbc on nitrous
1100 hp @6,800 rpm
set up for `1/8 mile sprints.
what size impeller would be best?
My guess would be an AB. Don't think it matters what distance, does it??
edited to be more specific: AB Berk cut w/ good race detail.

[cyclone]

My guess would be an AB. Don't think it matters what distance, does it??
good question. hell i dont know. But hey do you notice that Squirtin Thunder always ends every sentence with!!!!
Jim what's up with that?

[Squirtin Thunder]

good question. hell i dont know. But hey do you notice that Squirtin Thunder always ends every sentence with!!!!
Jim what's up with that?
Well OK then ......................

[steelcomp]

He yells a lot, too!!! :D

[Squirtin Thunder]

He yells a lot, too!!!
These engines are loud or is it the damn "Lawn Mowerman" again ???

[steelcomp]

Cyclone, I would think you'd be one of the go-to guys for a question like that.
You're not stirrin' the pot are ya?? :D

[Squirtin Thunder]

I kow that my MPD Impeller had a super hole shot compared to the stock Berk stuff I have here ........................

[canuck1]

500lb tunnel hull
aluminum bbc on nitrous
1100 hp @6,800 rpm
set up for `1/8 mile sprints.
what size impeller would be best?
Scott 2-stage sprint set up

[cyclone]

Cyclone, I would think you'd be one of the go-to guys for a question like that.
You're not stirrin' the pot are ya?? :D
i know nuthin about nuthin. ask anyone. not stirrin the pot i just like to hear peoples opinions. i'm a naturally curious person just ask my dad. I tore apart all his cars as a kid. never did put them back together.

[*BN*]

500lb tunnel hull
aluminum bbc on nitrous
1100 hp @6,800 rpm
set up for `1/8 mile sprints.
what size impeller would be best?
Is this a trick question?
The size that doesn't spin 6801 rpm.
Sorry in advance for the bad humor. :hammer2:

[LakesOnly]

How about one of them newfangled titanium A/C impellers with pivoting hemispherical vanes and automatic load-adjusted pitch...with the optional spaceage nanoparticulate ceramic impregnated wear ring? Bolt on deal, isn't it?
Oughtta help you break the current tunnel boat jump record.
:D
LO

[cyclone]

yes yes whatever did happen to that tunnel boat jump record attempt?

[Cs19]

Is this a trick question?
The size that doesn't spin 6801 rpm.
Sorry in advance for the bad humor. :hammer2:
exactly!
Gotta start somewhere, throw an A in, see what it turns.

[Bense468]

Menkins

[flat broke]

Mike, if your asking for a friend, you know we need to know the curve of the power for the motor, not just the peak number. If you don't have dyno sheets, at least throw in the CI, CR, and some cam specifics so we can get a feel for the motor. Why you ask? We need to see where the motor makes the power, not just how much it makes. No sense dialing in a setup to spin 6800RPM to get a peak number if the difference in HP between 6200 and 6800 is 50hp or so ;)
I'd venture to guess that a "properly detailed and fully loaded stainless A" would be a good place to start. You might want to call over to MPD/DNE and see what Marty was runnin in the limo before he got the placecraft. The HP is similar to what you are looking at, and since the weight of the boat and engine block is irrelevant to the impeller so long as it is loaded, that should get you close for a starting point.
If the subject of this excercise can't round up a "loaner" A, and has to buy new, have him buy the AA, then start testing, whittle it down until he is happy with peformance. You know the drill on this so I'm assuming this is just another version of the "riddle me this" thread :)
Chris