Thread: Cavitation on RXP-X
02-18-2009, 06:43 AM #1
Cavitation on RXP-X
Still cannot figure this one out.
My 08 RXP-X has a Riva Stage 1 + the following
Riva Pump Extension
83 Nozzle ring
Out the hole hits the limiter and then pulls hard to top end
I have checked pump clearance and my pump extension install and cannot find anything wrong.
Is it possible that the ski has to much power for the 15/22? I just installed the X-charger upgrade last night and want to use all this for a crazy hole shot!!
02-18-2009, 07:23 AM #2
02-18-2009, 10:00 AM #3
- Join Date
- Jan 2006
- Rydal, Georgia U S A
Pull the collar back and put a 1/3 piece of circlip in the space and run 1 wrap of ele. tape to hold it in. The Stainless collar is probably oscilating. Look with a light while it's idleing, you should be able to see a shake in it.
02-18-2009, 11:05 AM #4
I installed a brand new carbon seal and floating ring with the pump extension. After about 5 runs I removed the driveshaft and reinstalled to ensure everything was correct. (And it was)
I ran a stage 1 RXT-X and came out of the hole side by side spinning 8650 until it hooked up around 30mph and pulled away.
02-18-2009, 12:26 PM #5
The problem with cavitation is a bit of a tricky issue. First, it is important to recognize the problem is not just a problem with significantly modded RXPXs, but also the RXPs. For me, I have just accepted the problem given I need to run the R&D grate to prevent bucking when running in the 80+ range. However, since you have the pump extension, you should be able to run the worx grate (that some report having helped with the cavitation) without the fear of bucking (to about 83mph).
As for RPM's that is a bit more tricky. Since you live in the heat, the 15/22r with 82mm should be ok. Here in Miami, with water temps in high 60s/low 70s, I had to tweak my prop to run the 83mm ring (when running in fresh water I had to drop to the 81mm ring in these cooler temps).
If you post a bit more info, I should be able to have a better understanding of where you're at. Also, are you running a 3" Riva front intake with your Riva X-charger upgrade? If so and if you're running in the ocean, you should try the 4" kanaflex with the air filter and prefilter from Riva's Ultra 250X kit (its a matching 4" filter that is made of a wire mesh as opposed to the cotton fiber you'd buy elsewhere).
I hope this helps you
02-18-2009, 01:28 PM #6
Sounds like cavitation is a common problem at this level of mods.
Going to check the floating ring for wobble like JAWZ recomended.
I am running the 3" Riva front intake. If I can get my hands on some Kanaflex I will try the Kawi filter ( I have one on my work shelf )
02-18-2009, 04:47 PM #7
I have had a similar problem in rough and i hear a strange sound like a 'tung' in the pump and then a change of handling.
It coul be the jawz idea? Could you explain clear for a newbbie and not well english?
02-18-2009, 04:49 PM #8
Explain me the floatin ring option please?! Which ring? What and where to check? How to solve?
02-19-2009, 03:34 AM #9
02-19-2009, 03:45 AM #10
- Join Date
- Mar 2008
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