X4 big bore VE impeller ? turnning 8k
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Re: X4 big bore VE impeller ? turnning 8k
Originally posted by jetskijockey View PostFamily ski?
Seriously though Dave I think you are beyond what I can advise at this point. My SS HX800 turned over 7800 but that's the most I've seen. I like your vid with the GPS. That dial runs up quick when you squeeze it! Awesome
Wait a minute it is a "family ski" actually. It was his son's ski.Last edited by Matt Braley; 06-25-2020, 07:23 AM.
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Re: X4 big bore VE impeller ? turnning 8k
Thanks Matt
Took a while to get this engine dialed in now I need to get a impeller matched to the HP, I talked with Glen at Impros and he thought switching from a 16/23 to 16/25 would do the trick, clearly not.
Skat has no taller pitch options for the 140mm D75 pump so its a guess and go from here.
May have to find a 148mm pump, not sure what size impeller options that would give me, for sure another 2,000 out of the wallet.
Going to test an 80mm exit nozzle this weekend but I don't expect to see more then a 100 rpm drop, maybe 1-2 mph gain but still turning 7900
She is a trip to ride, the power comes on from the crack of the throttle.
I wish Justin was around to see this run, It was his dream child, Still kicking myself for selling his Big Red Farthing hull. This engine in that hull would have been insane.
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Re: X4 big bore VE impeller ? turnning 8k
Not all Skat D75 pumps were 148mm, I have 3 older Skat Mag pumps, 1 is C75 six vane 140mm 1 D75 6 vane 140mm and 1 D75 12 vane 140mm
I was running the D75 six vane 16/23 & 83mm nozzle in my x4 920 ski with a top speed of 70.1 and rpm at 7750, last fall I swapped the D75 for the C75 mag and ran a Solas SC SD XII 17.5/ 26.5 82mm
nozzle and ran 71.5 at the same 7750 rpm
Before I had the 12 vane pump I used the D75 six vane from the 920 on the 970 and oddly enough it ran slower but turned 7950, This spring was the first run with the 12 vane 16/25 and top speed
was about the same as the 16/23 and yet the rpm went up not down as you would guess going from a 23 pitch to a 25 pitch
Friday I tried the 80mm nozzle on the 970 and rpm came down 200 but no gain in speed, 80mm is not the way to go
As of now I'm going to repitch the 16/25 to 16/26 or 16.5x26.5
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Re: X4 big bore VE impeller ? turnning 8k
Update
Glen at Impros said re-pitching to a 26 may not work because the blade tips are getting close to the stator vanes, He's right, less then a 1/4" there now with a 25 pitch.
Working on locating a 148mm pump,lots more options for impellers
This 140mm 12 vane D pump will be up for sale if anyone is looking for one.
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