65v nozzle vs 62t nozzle (144)

JetManiac

Stoked
Site Supporter
Vendor Account
Location
orlando
The 65v has a 5deg up sweep in the design. Also much different shape to the reduction in the nozzle. More of a bell curve with more volume inside the nozzle.

The trim ring mounting ears are wider than on a 62t as I relearned recently.
@Little_Franny
 

Crab

thanks darin...noswad!
Location
Seattle
Im hoping #zero will chime in and give us a tech lesson on pro's and cons as it applys to our standups.
 

OCD Solutions

Original, Clean and Dependable Solutions
Location
Rentz, GA
He's posted up a very long explanation of the differences before as well as a table with all the different dimensions and angles. I'm out of town or I would search it out.
 

JetManiac

Stoked
Site Supporter
Vendor Account
Location
orlando
65v will make ski looser and more nose high, depends on your setup if this is better or worse. It will also loosen the pump due to the larger nozzle volume, again depends on your setup. There is no 'better' nozzle, just depends on the rest of your build which is 'better.'
 

Crab

thanks darin...noswad!
Location
Seattle
He's posted up a very long explanation of the differences before as well as a table with all the different dimensions and angles. I'm out of town or I would search it out.
Yea I found this.

The basic reduction nozzle rules are; the larger the nozzle exit diameter, the greater the volume of water you can move. This is great for a freestyle bottom end and hole shots but the problem is that sometimes you do not have the proper exit velocity for top speed. The smaller the nozzle exit diameter, the greater the velocity of the water exiting, the better the top speed. The problem is that sometimes there is not enough volume of water to get the ski to top speed. It takes a blend of the two that gets both hole shot and top speed. If you have two different exit sizes or angles to compare, then one is more than likely better than the other and it takes testing to find out what works best with your setup. All the nozzles have a tapered exit angle and it is NOT recommended to bore them straight because it loses pump efficiency so the angle should be maintained if boring your nozzle. Each reduction nozzle that Yamaha develops is specifically engineered for their skis by the engine power to weight ratio, pump size, impeller type & pitch, hull design, top speed, drag etc. Most of their jet-ski's with smaller displacement engines that weigh less use the steeper 25.5-degree reduction nozzle angles with varying nozzle exit tip angles. While the bigger ski's that weigh more with the larger engine displacements use the 21-degree reduction nozzle angle with different nozzle exit angles and sizes. Some of their nozzles even use a bowl shape design with the nozzle exit angled upwards. Your hull can travel at radically different angles at different speeds depending on your ride plate, venturi angle and even how you're positioned on the ski. The steeper nozzle exit angles of 3.5-degrees or more will lighten the nose of the craft and may add top speed. While the shallower nozzle exit angles of 2.5-degrees or less will deliver improved performance in rough water conditions by producing more nose pressure to drive the hull through the bumps which is perfect for closed coarse and offshore competition race boats. Also a ski traveling at an angle of 2-degrees does not bring in the same amount of water into the intake tunnel as a ski traveling at 5-degrees at real high speeds. The faster the ski travels the greater its tendency to run flatter and use a smaller venturi. If you continue to try to run at 5-degrees, then you're going to run into the pump over stuffing problem and a bigger diameter venturi may be just what you need to process that extra volume of water coming into the intake. All these things need to be taken into consideration when using other reduction nozzles types with different angles and exit diameters.

Here's a chart to see all the different angles and dimensions of the reduction nozzles.


index.php
 

KTM434

Jamie FN Hickey
Location
Palm Coast FL
I personally hated the 65v nozzle with the added static trim in surf. Every time you accelerate the nose lifts and tail drops just as you'd expect while pulling a trim lever slightly. Reentries are harder to keep the nose down because of this also. I wouldn't say it rides more loose though since it's driving the tail into the water, it actually feels more planted. If you ride a heavy ski with no rocker and pearl a lot then it may work for you. If you want to flip with no trim but always come up a little short on rotation this may help. Flatwater guys would probably love it for setup wakes or extra trim flow. It all depends what you have and what you're after
 
Currently swapping from 62T nozzle to 65V, had to trim mounting ears to get trim ring to fit and had to clearence some of the rib that runs around the nozzle at about the mounting ears. Have not got ski back in the water but will report back when I do.
 

JetManiac

Stoked
Site Supporter
Vendor Account
Location
orlando
I personally hated the 65v nozzle with the added static trim in surf. Every time you accelerate the nose lifts and tail drops just as you'd expect while pulling a trim lever slightly. Reentries are harder to keep the nose down because of this also. I wouldn't say it rides more loose though since it's driving the tail into the water, it actually feels more planted. If you ride a heavy ski with no rocker and pearl a lot then it may work for you. If you want to flip with no trim but always come up a little short on rotation this may help. Flatwater guys would probably love it for setup wakes or extra trim flow. It all depends what you have and what you're after

You should add that this was on a super short hull(aquabot).
 

KTM434

Jamie FN Hickey
Location
Palm Coast FL
Actually it was on my -2" Freak.
I also rode the orange Toby T1 hull in Daytona and could instantly tell it had the 65v nozzle on it without asking or ever having tried that hull before. It's just not for me but other people may like it
 

Crab

thanks darin...noswad!
Location
Seattle
Currently swapping from 62T nozzle to 65V, had to trim mounting ears to get trim ring to fit and had to clearence some of the rib that runs around the nozzle at about the mounting ears. Have not got ski back in the water but will report back when I do.
The trim ring for this nozzle is bigger than the raider trim ring.
 
Top Bottom