FX-1 tweaked SXR impeller any good for FX-1 with kawi 140mm pump?

J

john_650sx

Location
uk
hi guys,

i have been doing a lot of research on impellers and to be honest seem to be getting more confused...

i have seen a re-pitched SXR impeller (10/18) with a bit of a cut back and wondering if this will be good for hitting hard at the bottom with my fx-1 kawi pump??

i have read on here someone is running the SXR impeller with the big hub pump cone and if i can afford it i want to add one of those too....

just in case it makes any difference, spec will be as follows (ski still being re-built):

61x/61x (cylinders port matched but not full on port-job)
b-pipe
head
48mm ATP carb
wetjet manifold
carbon reeds
ATP lightweight 62t charging wheel (with EPIC if it works)


am i right in thinking that the higher the pitch numbers means its more geared to top end speed? think i read somewhere that the second angle is referring to how many inches the ski should move per revolution or something? is there a basic rule i should be following when looking at impeller pitch? i know you cant compare different makes of impeller but there must be a general rule?

cheers

john
 
swapmeet

swapmeet

Brotastic
Location
Arlington TX
The two numbers refer to the pitch at the begining and end of the prop.
Higher numbers = more top end.

Low numbers are great, but your motor needs to be able to push it.


I have no idea about the Kawi parts.
 
jetskijockey

jetskijockey

Location
Eau Claire, WI
I talked to dave @ impros and he recommended a 11/16 hooker with the pump cone, but that impeller may be more than what you are looking to spend. My setup is similar to yours.
 
J

john_650sx

Location
uk
thanks a lot for the info guys, i want a good set up but would like to try and avoid spending an un-neccessary fortune as i am sinking deep in this re-build! think i will try an sxr impeller of some sort, hopefully my local machine shop will be able to mod it to fit the 650 pump for me......
 
special fx

special fx

X
Location
Brigantine, NJ
A stock SXR prop is absolutely the best for the $$. It would work great with your motor setup. The 10/18 would work good if you had the afterburner pump cone or a 750/800 exit nozzle.
 
J

john_650sx

Location
uk
well I decided to go ahead and buy something, a solas 11/17 swirl (bearing in mind the post above regarding advice from impros). Hopefully this should be ok for me, I have both 650 & 750 nozzle set ups to play with. It just comes down to cash deciding if I install the afterburner cone. Do they make much difference? I have heard good things.....
 
jetskijockey

jetskijockey

Location
Eau Claire, WI
I do a lot of river riding and wanted a impeller for just that. Which is the 11/16. I for now have a solas 14/19 650 impeller I will be installing. From what I heard the pump cone makes a pretty good difference. You just need to run a big hub impeller for it.
 
J

john_650sx

Location
uk
as it goes i managed to get hold of a mint skat big hub impeller too so i think i will be selling the solas swirl and using the skat along with a TBM cone. once the ski is re-built i will post up my findings....
 
J

john_650sx

Location
uk
just an update on this, i am currently running a Hydrospace HSR S4 impeller 11/17 and seems to be working very well with the R&D pump stuffer/cone (impeller is big hub to match)

i just wondered if swapping out the kawi 650 exit nozzle for a bigger 750 nozzle would give any further bottom end?
 
J

john_650sx

Location
uk
i am using a 650sx nozzle with some spacers behind the reduction nozzle, as i was struggling to get the steering cable to miss the water fitting when using the X2 nozzle.

questions is, do you get the reduction nozzle bored or is it the exit/steering nozzle?

i think i have a 750 couch aluminium reduction nozzle (might even be A/M as there are no fins) and its a lot bigger than the 650sx plastic reduction nozzle - would this offer any benefit or just undo what the pump stuffer is doing?

got so much stuff here i can try, i don't really know where to start!

my gut feeling is that i would be better with the larger aluminium reduction nozzle and then the X2 exit nozzle?
 
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special fx

special fx

X
Location
Brigantine, NJ
The reduction nozzle diameter is what matters, not the steering nozzle. If you use a steering nozzlw other than 650sx or X2, the steering pivot will be much further from center and will greatly reduce your steering throw.

Did you relocate your cooling line fitting to the other side of the pump? If not, maybe thats whats interfering with your steering cable with the X2 nozzle??
 
J

john_650sx

Location
uk
ahh i see, i might try the larger 750 reduction nozzle then. i have currently got a full 650sx set up so steering is ok. the line was relocated to the other side of the pump, but i think my plug still slightly got in the way, i think my pump may be set slightly too far back, (or forward), but it goes together and seems to work good now, just wanted to see if the bigger reduction nozzle would help?

its bigger in all aspects, not just a bigger bore, seems to have more volume......

ideally i would like another FX hull to have another go at the pump and add the pipework to use the X2 trim this time......
 
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