how much hp to turn impeller?

[wenkel]

how much horse power would it take to turn an "a" impeller to around 6000 rpm?
or a "aa" to say about 5500 rpm? just trying to figure out what to do to my engine thanks

[Dog]

675 to 700 Should turn an "A" 6000 RPM or a "AA" 5500 RPM.
[ October 17, 2003, 02:26 PM: Message edited by: Dog ]

[jackpunx]

I turned 5600 with my 618hp 509ci

[Jet City]

According to LV's calculator I get these figures.
A 5600 rpm = 554hp
A 6000 rpm = 681hp
A2 5500 rpm = 633hp

[Dog]

Jet City Rebel:
According to LV's calculator I get these figures.
A 5600 rpm = 554hp
A 6000 rpm = 681hp
A2 5500 rpm = 633hp A2 5500 rpm = 683hp?
[ October 17, 2003, 05:16 PM: Message edited by: Dog ]

[slotracer]

whats it take to turn an a at 5200?
thanks pat(slotracer)

[Dog]

Aggressor "A" 533Hp
American Turbine "A" 446Hp
Berkley "A" 444Hp
Dominator "A" 523Hp
Legend "A" 486Hp

[Jet City]

SLOTRACER:
whats it take to turn an a at 5200?
thanks pat(slotracer) I got 444hp (same as Dog), I have no idea the accuracy of this calculater, but knowing how particular LV Jetboy is, its probably pretty good.

[LVjetboy]

Well, assuming Berkeley published data correct, JPC's accurate for Berkeley.
But mfg's are flakey when it comes to test data. You know, not enough time or money to test. Some just copy Berkeley curves and calibrate (extrapolate?) from a few test points. Then again, how accurate is your typical lake jetter squinting at top speed and reading the tach at 5200? Or he quotes his engine as 618 hp? Is that 618 per dyno measured...or corrected, or just estimated from printed sources? And would that be the same 618 during actual test conditions when he alegedly read his tach (however accurate) at 5200?
Then there's always pump flow work or blueprinting and what does that do to the stock pump curves?
Lots of unknowns. But it's the best we got and certainly better than nothing. Even with all these unknowns, if you account for different test conditions, equipment accuracy and pump mods, I think you can get close.
jer

[slotracer]

my boat turns 5200 tops its a mild 454 with tunnel ram, 049 oval heads, 2 600 holleys gps with another boat that gps at 69 and i was still pulling away. we figure that i am doing right around 70-71. jim brock did the pump its a berk jc with a little bit of work done to it. boat is a 18ft. tahti tiger. not bad for a family cruiser.
pat(slotracer)