SoCal Jet Boats
Tech Talk => Jet Pumps => Topic started by: ROC on August 22, 2007, 10:47:00 AM
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I'm interested in hearing what opinions, if any, that may be out there for impeller selection.
The boat.........
21 Ultra 21 XS - a relatively heavy boat by design. Add in several batteries, large sound system and you're up to damn near 4,500 lbs
The motor........
523 cu
700 hp at 6500 rpm
670 ft lbs at 5200 rpm
on the DTS Dyno
The pump......
Berk 12 JG
Mag-bronze legend a/b
inducer
set back
Any pump gurus wanna give it a shot?
Thanks in advance
ROC
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Ya i also read somewhere that when you are doing a build, you have to match your cam to your impellor?
Is this true , a sales slogan, a myth? WHAT is it ;D Give up the info.
2sav
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Call Dave at Aggressor and tell him Colby gave you the number, he'll tell you everything you need to know... 310-324-6904.
What limited info I have, I learned from him and his grandson Brandon.
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Ya i also read somewhere that when you are doing a build, you have to match your cam to your impellor?
That statement is a little reversed....I am no pump expert but heres a quote from the link below:
As a rule of thumb, you should always decrease your impeller trim one size, i.e. "A" to "B" when going to a hotter cam. The jet drive needs lots of torque on the top end a very little below 3000 RPM so you must carefully match your new torque curve/HP curve to the impeller SHP absorption curve. If you also add cubic inches then an impeller size change may not be needed.
based on your info given, you might want to change to a $tainle$$ impeller.
also, heres some more good info on imepller to engine matching:
http://www.cpperformance.com/TechTips/impeller.htm
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Ok now how can you tell what impeller you have? Last year i bought the Energizer kit from cpperformance but dont know what impeller i have?
2sav
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That statement is a little reversed....I am no pump expert but heres a quote from the link below:
based on your info given, you might want to change to a $tainle$$ impeller.
also, heres some more good info on imepller to engine matching:
http://www.cpperformance.com/TechTips/impeller.htm
Good link. Thanks. I'm thinking I maight have to play around with some impellers for a bit. A friend offered his AA to try. I'm not much for trial and error so I may just have to suck it up and take to a pro.
Fun stuff none-the-less. ;)
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Ok now how can you tell what impeller you have? Last year i bought the Energizer kit from cpperformance but dont know what impeller i have?
2sav
Well i found out what i have.
I sent cpperformance a email, and they got back to me quick. I got an A impeller and he even hooked me up on a cam and lifter set.
Thanks Rick.
2sav
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I'm interested in hearing what opinions, if any, that may be out there for impeller selection.
The boat.........
21 Ultra 21 XS - a relatively heavy boat by design. Add in several batteries, large sound system and you're up to damn near 4,500 lbs
The motor........
523 cu
700 hp at 6500 rpm
670 ft lbs at 5200 rpm
on the DTS Dyno
The pump......
Berk 12 JG
Mag-bronze legend a/b
inducer
set back
Any pump gurus wanna give it a shot?
Thanks in advance
ROC
first...a mag/bronze impeller is fine in your application. i've put over 1000hp to mag bronze impellers with zero problems. You dont need a stainless impeller. (no offense brad)
your motor makes peak power at a fairly high rpm level. peak hp is what you want to worry about when sizing the impeller to the engine.
how many rpm does the engine turn at wide open throttle when driving through in smooth water?
is this Wes' old boat?
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You dont need a stainless impeller. (no offense brad)
Mike, no offense taken....im no pump expert by any means...pure amature ;D .....thanks for posting some insight. :)
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first...a mag/bronze impeller is fine in your application. i've put over 1000hp to mag bronze impellers with zero problems. You dont need a stainless impeller. (no offense brad)
your motor makes peak power at a fairly high rpm level. peak hp is what you want to worry about when sizing the impeller to the engine.
how many rpm does the engine turn at wide open throttle when driving through in smooth water?
is this Wes' old boat?
Yeah it is Mike. I take it you're fairly familiar with it then. Any guidance would be great.
Thanks
ROC