Nozzle Boring ''How To ''

Pablo

sqeez bth levrs & lean bk
Site Supporter
Location
georgia
anybody using bored nozzle with hooker prop? I read some on the pump/prop database thread.
 

SuperJETT

So long and thanks for all the fish
Location
none
is 86mm the break-even point? at what diameter does an average pump setup (a/m prop w/ wet wolf cone) start to loose thrust. Will a TBM cone allow someone to take the nozzle diameter larger vs. a ww cone?

These are the type of questions that you have to do testing to get the answer, **on your setup**. What works for me may not work for you due to factors like water makeup, altitude, engine torque, etc etc.
 

tom21

havin fun
Location
clearwater FL
I have two different diameter coffee cans as nozzle and steering nozzle and my ski roasts everyone elses.:dunce: it could also be the flavor crystal in the premix.
 

#ZERO

Beach Bum
Location
Florida - U.S.A.
Tom, I think you should switch to decaf. :jester:

I could not feel any differences for a given diameter. The radar guys may find some gains.
The radar guns won't find any gains on the top end because boring the nozzle is for bottom end acceleration only and you'll lose some top speed.
 

Foximus

CFL Cheapass.
Location
Oviedo, Fl
On a side note... any expertise with x2 nozzles? From what I understand they are larger than the 750 nozzles... however I'm afriad to bore mine out as its just a brittle ABS plastic of sorts. Would it be benificiary to eliminate the laminar flow fins inside the nozzle?
 

Waternut

Customizing addict
Location
Macon, GA
On a side note... any expertise with x2 nozzles? From what I understand they are larger than the 750 nozzles... however I'm afriad to bore mine out as its just a brittle ABS plastic of sorts. Would it be benificiary to eliminate the laminar flow fins inside the nozzle?

Pretty sure the max you can bore the stock metal nozzle is 82mm. The X2 nozzle is 83mm. I've run both and never could tell the difference between the two. Handling is a bit different though due to the X2 steering nozzle being further back. I asked about the vanes in the X2 nozzle as well and got limited responses saying they may help but clearly no 'seat of the pants' difference. Maybe 82mm is the max for a 750.
 

Foximus

CFL Cheapass.
Location
Oviedo, Fl
What about a SXR stock nozzle?

just looking to see how I can get a bigger nozzle to accomodate the TBM tail cone taking up more room in the 650/x2 reduction nozzle.
 

Waternut

Customizing addict
Location
Macon, GA
Keep in mind Kawi's run a smaller pump than a SJ so naturally an 84-85mm bore is most likely going to hurt performance more than help it. The SXR nozzle is actually smaller at 76mm stock than the old SX nozzles at 80mm stock. They can both be bored out to 82mm though.

I always thought the whole point of the TBM pump cone/mag pump was the keep the pump loaded up at higher pressures. If you jack up the nozzle bore, you're basically just countering that expensive effort and unloading the pump and reducing the pressure back to normal.
 
Location
PA
The stock nozzle has a 1.5-degree taper and needs to be machined on a lathe.

Boring the nozzle straight through will make the pump less efficient.

If you would like to have your reduction nozzle bored out the right way, send me a PM.

Zero do you still have the ability to taper bore nozzles? I have a couple I am looking to get taper bored. Probably 2 or 3 nozzles. Please let me know. I’m a new member so it doesn’t seem to let me PM you.
 

SuperJETT

So long and thanks for all the fish
Location
none
Zero do you still have the ability to taper bore nozzles? I have a couple I am looking to get taper bored. Probably 2 or 3 nozzles. Please let me know. I’m a new member so it doesn’t seem to let me PM you.

This thread is over 9 years old.
 
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