- Location
- New Jersey
was wondering exactly what cavitation was and how to prevent it and detect it. All I really know is it's when air an air pocket is formed behind the impeller or something.
650/X-2 Cavitation
- Thread starter dbattersby20
- Start date
FlightPlanDan
Don'tTrustAfartAfter50
- Location
- Crescent Beach, FL
In a nutshell: it is when the impellor is moving at a speed beyond the efficiency of it's volute. (pump housing).
Bubbles form (seemingly out of nowhere) and decrease efficiency.
Cavitation means that cavities or bubbles are forming in the liquid that we're pumping. These cavities form at the low pressure or suction side of the pump, causing several things to happen all at once:
Bubbles form (seemingly out of nowhere) and decrease efficiency.
Cavitation means that cavities or bubbles are forming in the liquid that we're pumping. These cavities form at the low pressure or suction side of the pump, causing several things to happen all at once:
- The cavities or bubbles will collapse when they pass into the higher regions of pressure, causing noise, vibration, and damage to many of the components.
- We experience a loss in capacity.
- The pump can no longer build the same head (pressure)
- The pump's efficiency drops.
- Location
- Fort Worth
great explination.i nned to address this area of my ski too.
- Location
- New Jersey
So a change in the pitch would solve the problem. What kind of wear marks do you look for on an impeller to tell?
FlightPlanDan
Don'tTrustAfartAfter50
- Location
- Crescent Beach, FL
I don't think you can ever "truly" conquer the cavitation issue...although I could be wrong. Wear will be undetectable unless it is really bad for a really long time. Maybe a pro (impros) could tell.
Mag Pumps deliver greater perfomance mostly because they reduce cavitation. It's a hard thing to wrap your mind around...12 vanes...more stuff in the way of the water....but it works.
Cavitation will always be there. "Excessive" cavitation is something you can feel. Like seaweed stuck in the pump. (the motor goes like hell...but no thrust)
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I don't know what just happened with that post! !!!
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FlightPlanDan
Don'tTrustAfartAfter50
- Location
- Crescent Beach, FL
BTW: to answer your question about prop pitch: maybe.
There are quite a few things that can cause cavitation other than the prop.
An out of place or non-concentric pump shoe, an intake grate that is not so perfect, a bad pump seal....
Hard to diagnose.
There are quite a few things that can cause cavitation other than the prop.
An out of place or non-concentric pump shoe, an intake grate that is not so perfect, a bad pump seal....
Hard to diagnose.
FlightPlanDan
Don'tTrustAfartAfter50
- Location
- Crescent Beach, FL
Another thing, since we're in the older ski section, is the wear ring. I'd check this first. Older kawi's had a stainless sleeve pressed into an aluminum housing. Over time, especially in salt, galvanic action would occur.
The wear ring could be out of round, or even have holes in it.
The wear ring could be out of round, or even have holes in it.
- Location
- New Jersey
Thanks. I'm assuming the "wear ring" is same as the liner... That's what brought about this issue for me. My liner is warped and my prop wont turn at all (should be fun getting out). So im just going to buy another used pump and was trying to figure out what impeller to use. Just wanted to make sure I put the right setup back in and everything is installed correctly.
- Location
- Austin, Tx
I've got an x2 pump with a solas 13/18 if your interested. Ill sell it as a whole or in pieces, not pickey. PM me if interested.