Thread: i have a small nozzle
01-04-2007, 04:07 AM #1
i have a small nozzle
Guys jokes aside i cut my R&D hydro nozzle to stock length after finding it was slowing me down,not the gain they sell it as..
It was only a small loss but any loss is in the wrong direction,
Decided to cut to stock length last night and make myself a bullet proof copy of the plastic stocker
Here is where i ran in a small problem,
when cut to stock length the exit I.D has gone from stock 91mm to the new I.D of 93mm due to taper in R&D one
Will this affect the performance or has the work been already been done by the jet nozzle and the bigger I.D on the steering one be ok
Understand that the uncut one was causing slight back preasure due to its length and slightly smaller I.D which was 90mm thus slowing me a small ammount...
01-04-2007, 04:39 AM #2
- Join Date
- Sep 2006
Try it and let us know. I have not read of anyone else doing it, it might be something we did not know about.
01-04-2007, 05:00 AM #3
Exactly. Plus you have the stock nozzle to compare it to, directly. I can't wait to hear your results.
How much did you cut off?
01-04-2007, 06:25 AM #4
Last edited by Hydrotherapy; 01-05-2007 at 01:23 AM.
01-04-2007, 07:02 AM #5
I chopped off a Pro-Tec nozzle to stock length. I should be able to post on it in a week or two. I don't think the Pro-Tec is tapered though.
01-04-2007, 07:07 AM #6
hi spud nice to see we both have small ones...there all tapered from front to back see what your one now measures and let me know
01-04-2007, 11:51 PM #7
- Join Date
- Jan 2006
- Texas City, Texas
Based on my discussions with scat-trak techs, the optimal difference between the venturi and the swing nozzle is 3-4mm. If you had for instance an 85mm venturi and a 87mm swing nozzle, (2mm difference) then the boat would be difficult turn. on the other hand, if you had an 85mm venturi with a 93mm swing nozzle, (8mm difference) then the turning would be sloppy and not as responsive.
Of course, that may only apply to skat-trak venturis and swing nozzles. Not only that, they are strictly in the race world. Most people may want their steering to be loose so that their turns are not as sharp.
I have found 3-4mm to be just right.
We never talked about changing the swing nozzle diameter to effect top speed.
01-05-2007, 11:14 PM #8
if your I.D is bigger than before, I believe you will notice better take off or maybe you'll spin the heck out of that prop. You will lose top end for sure. Unless you run a larger prop to bring the rpms down. I think you will see increased rpms and loss of speed.
01-06-2007, 12:23 AM #9
I kept mine at full length. I compared the stocker to the R&D and I have a better top end with the R&D in my application. I like the way it turns too.
Either way, you don't want the plastic stocker it can break.
01-06-2007, 12:38 AM #10
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