Nozzle shape
- Thread starter Storbeck
- Start date
- Location
- New York
So I can comment on this. I ran a 62t vs the 5 degree up 144/148 nozzle. I felt that the bell shape added more low end but negatively impacted handling.
Any chance you know the bore sizes, or if they were both unmodified? I think, but I'm not sure, that the bowl shaped one has a larger bore in stock form.
- Location
- Asheville, NC
Im interested to hear feedback on this also... I imagine its similar to the way an adjustable garden hose works, like when you change the length it changes the spray pattern. Or like how an airbrush works, the needle distance or nozzle changes the spray pattern. Im also curious how does the length of the pump cone change flow.
- Location
- New York
Both were opened up to the Max that they could be in an effort to get play with some pump R&D Torrent was doing. We got about 1 more mm out of the 5 degree.
john zigler
Vendor Account
- Location
- wisconsin
Nozzles with different volumes will change/affect thrust.
Think of it like adding a short Wet Wolf freestyle cone on your pump, allowing the water to collapse sooner out of the stator veins increases volume, and thrust. (Similar to a larger exit ID).
A nozzle with less volume will increase pump pressures.
Think of it like adding a short Wet Wolf freestyle cone on your pump, allowing the water to collapse sooner out of the stator veins increases volume, and thrust. (Similar to a larger exit ID).
A nozzle with less volume will increase pump pressures.
IMO: For 144mm nozzles. The pictures in the paper dont specify transition radius's so it is somewhat difficult to determine exactly.
Green nozzle is a "conical" (Pre 08'+ SJ and Blaster) l=appx 60-65mm
Blue nozzle is a "conical" (62T 701 Raider/Post 08'+ SJ) l=appx 40-45mm (longer transition/shallower angle vs. green and slightly larger blend radius)
Silver nozzle is a "streamline" nozzle (OEM GP760/ All Protec's)
An "exponential" Yamaha nozzle example is not shown. Watercraft nozzles that exhibit that shape: Seadoo R&D nozzles and the Jet Dynamics SJ/Blaster nozzle shape (I will post pic of those) The old Skat SJ nozzle was a very long conical as well as the current Blowsion (I believe is the Skat with Blowsion logo).
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- Location
- Asheville, NC
yesssss
2 “Exponential” nozzles
The JD is a Kawasaki SX(modified) same exponential as my SJ version I can’t find
The R&D That looks like a Seadoo) modified for a Yamaha Pump
The JD is a Kawasaki SX(modified) same exponential as my SJ version I can’t find
The R&D That looks like a Seadoo) modified for a Yamaha Pump
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I think your logic is flawed, it doesn't mean you have lost that pressure, it just indicates that is the pressure at the little hole where the rooster tail comes out.
Still, the overall point is valid, whatever is going through that little hole is not pushing you forward.
How did they work?
I think you missed my point but I should have worded it better.
The 5 psi that you calculated as the pressure at the outlet for the rooster tail, that number of psi is not subtracted from the pressure at the main nozzle.
An intuitive way to think about it, if you had a hole directly in the side of the nozzle, that hole would have the SAME pressure as the main nozzle. Running the water through a short section of hose with some fittings you'll have some pressure loss, but basically the rooster nozzle is going to be at a pretty similar pressure to the main nozzle.
Completely agree though that the water going through the little rooster thing is a loss, was just disagreeing with how you calculated the value of the loss.
The 5 psi that you calculated as the pressure at the outlet for the rooster tail, that number of psi is not subtracted from the pressure at the main nozzle.
An intuitive way to think about it, if you had a hole directly in the side of the nozzle, that hole would have the SAME pressure as the main nozzle. Running the water through a short section of hose with some fittings you'll have some pressure loss, but basically the rooster nozzle is going to be at a pretty similar pressure to the main nozzle.
Completely agree though that the water going through the little rooster thing is a loss, was just disagreeing with how you calculated the value of the loss.
I have not found one shape that pulls any harder than the other for a given diameter. I have noticed that the stream fans out and spirals more on straight bored nozzles with out vanes. Taper bored nozzles with vanes have a more compact stream that does not spiral as much. My superjet didnt go any faster with a 62t nozzle. I did find noticeably better thrust with a straight bored Protec nozzle that was 3mm larger diameter..
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- Location
- Buffalo, NY
This is a great, very informative thread! Has anyone with a FX1 with a 144mm pump swap try a 65v nozzle and/or a 62t nozzle with a Kawasaki X2 adjustable trim/steering nozzle? I'm torn between using a 65V nozzle with the X2 trim or the 62T nozzle with the X2 trim.
john zigler
Vendor Account
- Location
- wisconsin
Set up's will differ, with engine mods/needs, nozzle ID, and impeller type and pitch.
You will need to test/tune to see what works for you, your set up, hull type, elevation, etc.
I did some more Kawasaki 140 nozzle testing after this thread originally posted. Started with 80mm, 82, and 85mm. Larger nozzles pulled harder. There was only a 100rpm variance and top speed was the same. It did take longer to get the last 1-2 mph with the large nozzle. I also installed a stubby cone and it made no difference in feel, RPM, or top speed. My experience has been consistent between brands and pump sizes. If you want best acceleration bore the nozzle!