Boring the Stock SJ Nozzle

[bit]

What diameter are most of you running? I want as much low end as I can get. I enjoy the occasional WOT run, but I don't really care if I kill off a few mph. The ski has a Solas Concord 13/16 cutback by Impros, if that matters. I am not sure what effect that impeller has on pump dynamics and internal pressure.

Thanks for any help.

 

[ChrisGooch]

I think most people have it bored to around 85mm.

 

[MADMAT]

x2.



85mm.

 

[keegan]

where do you get them bored? (dumb question)

 

[MADMAT]

Paul at LPW did mine.

 

[bit]

where do you get them bored? (dumb question)

Any machine shop can do it for you. I plan to strap mine to a vertical mill.


What diameter is stock? 80mm?

 

[CarFanatic]

this is the stock plastic nozel that your boring? how much does it cost if you send ti to lpw?

 

[bit]

this is the stock plastic nozel that your boring? how much does it cost if you send ti to lpw?

No you are not boring the plastic steering nozzle. The nozzle you want to bore is the aluminum pump reducer nozzle.

 

[CarFanatic]

so the nozel behind the plastic one.

 

[#ZERO]

Paul at LPW did mine.

How much do they charge to do this and does it harm the stock siphon fitting?

What diameter is stock? 80mm?

The stock reduction nozzle is about 83mm and the steering nozzle is about 88mm.

 

[bit]

My stock nozzle measures exactly 82mm with 4 mm wall thickness.

does it harm the stock siphon fitting?

Boring it out will cut off the stock siphon boss. I will replace it with a small copper tube that I will press/epoxy in the hole.

Another question I have, are there suppose to shims under the bolts that hold the pump to the ski? I was thinking maybe these shims were added to put the nozzle slightly downward. This ski was raced in region 6 and at the world finals before I got it. I am trying to make it into more of a freeride/freestyle ski.

 

[DaUpJetSkier]

is it necessary to fix up the stock syphon or will it work after boring that big chunk off the inside?

 

[bit]

is it necessary to fix up the stock syphon or will it work after boring that big chunk off the inside?

It won't work as well or at all without putting another piece on it. The siphon works by having water flow over it and creating a vacuum. With the boss removed the hole is at 90* to the stream flow instead of pointing in the direction of the flow.

 

[Mile9c1]

Would anybody on here take a stock nozzle in exchange for the boring service??

 

[Crab]

It won't work as well or at all without putting another piece on it. The siphon works by having water flow over it and creating a vacuum. With the boss removed the hole is at 90* to the stream flow instead of pointing in the direction of the flow.

I am not so sure anymore, the stock SXR nozzle is mostly flat right there and has no real raised portion.

 

[bit]

Another question I have, are there suppose to shims under the bolts that hold the pump to the ski? I was thinking maybe these shims were added to put the nozzle slightly downward. This ski was raced in region 6 and at the world finals before I got it. I am trying to make it into more of a freeride/freestyle ski.

Anyone know anything about these shims?

 

[bit]

As it turns out you don't need to cut off the siphon boss. The nozzle tapers out to 87mm before you get there. No need to mess with the copper tubing.

Here is what mine looks like now.

 

[Boris]

Holly hell, that's thin.

How much material is left on those sides ?

 

[bit]

Holly hell, that's thin.

How much material is left on those sides ?

The very tip is 1.65mm and that tapers out to 3.20mm at the bottom of the cut. Plenty thick enough.

 

[Boris]

I have a spare nozzle from a Raider that I wanted to try this on.

I guess it's time to smile at someone with a big drill bit. :biggthumpup: