Freestyle Nozzle diameter-148 what’s too big?

[Chase Musetti]

I’m running a Solas 148 pump now with 11/17 prop and an RRP reduction nozzle/trim kit. Not sure what this reduction nozzle diameter is when stock, but mine is at 90mm now, oddly with the steering nozzle only at 86... I just measured it when I upgraded to the 148 pump. I’m going to open that up to at least 91mm.

Anyways, I know most nozzles can’t even be bored close to 90mm. So in my quest to properly pump tune, what negative effects can too large of a exit nozzle have? I’m still dialing in a new et967 motor setup with the 148 pump so I’m still trying to fine tune everything. Any chance it could be unloading the pump too much too quickly and losing thrust?


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[cookn]

sounds about right for nozzle bore but the turn nozzle should be about 2mm bigger and that will help. If anything the larger bores will help the pump slip a bit and build rpms before it loads the engine

 

[Harbor]

k, but mine is at 90mm now, oddly with the steering nozzle only at 86

That is odd and backwards...
For ref Thrust trim nozzel
For 144/148 are 86 reduction and 89 steering...

Having a 90 reduction already seems too big. Steering @ 86 too small.....

I have set back 148 behind a 1200 and 14/19... I bored 1mm each now at 87/90 and it seems big...I have 85.5 reduction too, seems better. Both work...

701 in the ski now, same pump, 7/14 prop either nozzle works.. not tried a 90 on the 1200, seems like it would take the bottom out, boring from 86/89 to 87/90 made less jerk down low, softened it..

Could you try 85 or 86 reduction and 89 ish steering first ? Or try a 92/93 steering... but that seems hella big

Edit: wondering if they used an smaller steering, 86 mm to compensate the big reduction bore...

 

[Chase Musetti]

That is odd and backwards...
For ref Thrust trim nozzel
For 144/148 are 86 reduction and 89 steering...

Having a 90 reduction already seems too big. Steering @ 86 too small.....

I have set back 148 behind a 1200 and 14/19... I bored 1mm each now at 87/90 and it seems big...I have 85.5 reduction too, seems better. Both work...

701 in the ski now, same pump, 7/14 prop either nozzle works.. not tried a 90 on the 1200, seems like it would take the bottom out, boring from 86/89 to 87/90 made less jerk down low, softened it..

Could you try 85 or 86 reduction and 89 ish steering first ? Or try a 92/93 steering... but that seems hella big

Yeah I figured bigger isn’t always better- gotta be a point where it’s working against me. I am looking for all bottom end and don’t care about top speed, but still.

I did have this same nozzle on my 144 Solas with JM760 and 9/15 prop and it was very snappy off the bottom. But it always kinda felt like the prop was spinning, which makes sense now... it unloaded way too quickly.

I don’t have any other nozzles to try, but I have a stubby cone I’m gonna try on and see if it makes it noticeably worse.


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[Christian_83]

Its all about getting putting enough pump load on the engine, for your riding style.
Here are some of the things you can adjust/tune - that ALL affect what exit nozzle diameter you should run.

Impeller pitch.
Impeller spacing to stator.
veins in exit nozzle/or de-veined.
Pump cone length.

I would deff rung larger diameter steering nozzle than exit nozzle. 90mm exit nozzle. 92 or 94mm steering nozzle.

 

[Chase Musetti]

Its all about getting putting enough pump load on the engine, for your riding style.
Here are some of the things you can adjust/tune - that ALL affect what exit nozzle diameter you should run.

Impeller pitch.
Impeller spacing to stator.
veins in exit nozzle/or de-veined.
Pump cone length.

I would deff rung larger diameter steering nozzle than exit nozzle. 90mm exit nozzle. 92 or 94mm steering nozzle.

Since I found it was 90mm, I run the prop as close to the veins as possible and I started with the stock pump cone. And the pitch is 11/17 but close to 12/18 in the gauge. So I’m trying to make it all seem bigger to compensate for the large exit nozzle. I might try another nozzle to compare and see what 86 feels like. And I plan to bore the steering nozzle to 92mm


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[Christian_83]

okay, but are you spinning/burning your prop? or do you like the pump setup "tight" ?
Well its defiantly a jump from 90 to 86mm exit nozzle

 

[Harbor]

For more reference I Realized My buddy has a 4 mil pv dasa 1000 in a carbon rickter, 195 psi, enhancer and ninja pipe or b-pipe mod chamber, uses both at times, black jack 44's, Solas 148 pump, 8/16 Solas swirl prop, 86mm reduction and 89 steering and it rips......

If anything he'd like to try less pitch on the prop... But too me it seems good.

Mag 155 pumps run around a 89/91 ish reduction and 192, 194 ish steering.

Didn't see what brand your prop is, but when measured, it's close to 12/18...... Isn't Skat numbering system higher, not sure that matters now that you've measured it.... Prop seems big...... Guess that's why your trying to dial in nozzel sizes/etc..... Maybe calling Impros would be good here

 

[Chase Musetti]

For more reference I Realized My buddy has a 4 mil pv dasa 1000 in a carbon rickter, 195 psi, enhancer and ninja pipe or b-pipe mod chamber, uses both at times, black jack 44's, Solas 148 pump, 8/16 Solas swirl prop, 86mm reduction and 89 steering and it rips......

If anything he'd like to try less pitch on the prop... But too me it seems good.

Mag 155 pumps run around a 89/91 ish reduction and 192, 194 ish steering.

Didn't see what brand your prop is, but when measured, it's close to 12/18...... Isn't Skat numbering system higher, not sure that matters now that you've measured it.... Prop seems big...... Guess that's why your trying to dial in nozzel sizes/etc..... Maybe calling Impros would be good here

Skat prop and yeah it measured high as expected. On paper I wanted to start with and repitch to10/16, but I through it in there as it was since my nozzle was huge. I can’t imagine going lower now since I imagine it would make it worse. I think I need this 11/17-12/18 to compensate. Guess I’ll just try a stock bored nozzle without my trim and see how it feels. I wonder how much a stubby cone equates to in millimeter of nozzle bore, guess I’ll just pass on putting that in...

Thanks for the input- might just try to ol trial and error and report back


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[Kaylee.S]

I didn't see it in any of the responses....what's the setup doing that you don't like? Is it too loose or too tight? Going to a smaller pump cone will loosen it up.

On my pump gas 964 with TL and a tnt pipe I was running a 14/18, 3mm cutback, no spacers, medium cone, 86.5 exit nozzle, 94 steering.

My 800 Dasa at 215psi, b pipe, enhancer its 10/16, 5mm cutback, same cone and stock bore nozzle.

Now I can't seem to put enough prop in my new 1021! Eeek!

 

[Christian_83]

Well there is ALOT difference when it comes to your riding style and level (not that im in the higher end of that level lol!)
But the "bullet proof" setup, seems to be low pitched impeller, that makes the engien come on the impeller instantly. But you might loose quite som mid and topped.
For instance, Art said my ET1107 @185psi pumpgas with 49FS, MSD TL, PFP dry and 155 setback Skat mag should run 8/16 impeller.
I started with a longblade, thin blade cutback 12/16 and it ran really strong and good. I wanted to try and play with it and pitch it up and see what the ski did.
What i noticed was, after 3 hours riding i could the implosion marks from cavitation on my brand new impeller. So im burning my prop. I repithced it to 13/18 where im at now spaced 1mm from stator, with medium cone, 89mm exit nozzle and 92 or 94mm steering, cant remember. It hits really nice, im sure i could squish a bit more out. This weekend i think to try racegas setup.

My advice is, try and mess a bit with it yourself, you might learn something and found unused potential

 

[TheBuzzard]

if the nozzle is too big for the motor power, it will spin the prop and you'll lose thrust off the bottom. before I bought my red freak, the original owner had the nozzles bored thinking that was going to make anything better. that's all everybody on this site talks about, GET YOUR NOZZLE BORED OUT BIGGER! wrong! I just threw a stock GP800 reduction nozzle on there and gained way more bottom end thrust. the prop didn't spin when I hit the setup wake and the flips got a lot higher. I got a cherry 144-148 62T reduction nozzle bored to 87mm if anybody wants to buy it lol

 

[Chase Musetti]

Thanks guys- as far as how it feels now, it just lacks the bottom end hit out of the hole- not terrible, but not quite as expected. However that can be related to a number of things. I’ve had a lot of changing parts recently so I’m still getting a feel for the setup and how certain changes effect it. Since I can’t do anything about the bore now, I might fabricate a smooth transition insert to close it up a little. I’m also adding TL soon which will help.


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