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Ragged Edge
Joined: 20 Jan 2008
Posts: 30
Location: Vancouver Iland BC
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 Posted: Sat Mar 21, 2009 12:19 pm Post subject: Impeller pitting |
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Can anyone tell me why my impeller is pitting like this. SJ high skew. Every blade is pitted in the exact same spot. My stock 3blade has stains or burn marks in the same spots.
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MISSBHAVEN
Joined: 20 Jun 2005
Posts: 310
Location: Grande Prairie, Alberta
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| Posted: Sat Mar 21, 2009 12:45 pm Post subject: |
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It's caused by cavitation which is when i"supersonic" shock waves are created when air is seperated from the water. You need to find out what is causing the cavitation. Give Dale a call at Outlaw Eagle and he should be able to help you.
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It's always the Navigators fault!
Last edited by MISSBHAVEN on Sat Mar 21, 2009 1:46 pm; edited 1 time in total |
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Ragged Edge
Joined: 20 Jan 2008
Posts: 30
Location: Vancouver Iland BC
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| Posted: Sat Mar 21, 2009 1:14 pm Post subject: |
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| Thanks, I thought I had read that on here somewhere, just making sure. Does this look like it is cavitating badly?
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MISSBHAVEN
Joined: 20 Jun 2005
Posts: 310
Location: Grande Prairie, Alberta
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| Posted: Sat Mar 21, 2009 1:45 pm Post subject: |
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| Ragged Edge wrote: | | Thanks, I thought I had read that on here somewhere, just making sure. Does this look like it is cavitating badly? |
It looks bad enough that something needs to be done but it also depends on how many hours it took for the impeller to look that way.
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It's always the Navigators fault! |
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Ragged Edge
Joined: 20 Jan 2008
Posts: 30
Location: Vancouver Iland BC
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| Posted: Sat Mar 21, 2009 2:05 pm Post subject: |
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| Thanks again, aprox 150 hours
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bowintow
Joined: 08 Feb 2009
Posts: 4
Location: MONTANA
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| Posted: Sat Mar 21, 2009 10:59 pm Post subject: |
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YEP, THAT'S CAVITION! 90% OR MORE CAVITATION PROBLEMS ARE CAUSED BECAUSE OF LACK OF WATER TO THE IMPELLER. TOO SMALL OF GRATE, MESSED UP GRATE, ROUGH BOTTOM OF BOAT CAUSING TURBULENCE IN THE SMOOTH FLOW OF WATER TO THE IMPELLER.COULD BE A FEW OTHER THINGS BUT LOOK TO THE SUCTION SIDE OF YOUR PUMP. GOOD LUCK.
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WHAT DID YOU SAY YOUR NAME WAS MISTER? I DIDN'T! |
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Ragged Edge
Joined: 20 Jan 2008
Posts: 30
Location: Vancouver Iland BC
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| Posted: Sun Mar 22, 2009 9:44 am Post subject: |
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| thanks for the input. the bottom of the boat is a little chewed up and the transition from hull to the intake was not designed very well.
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RPM
Joined: 17 Dec 2006
Posts: 189
Location: Nechako
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| Posted: Sun Mar 22, 2009 3:01 pm Post subject: |
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another place for air to get in is at the back of the easy clean between the plate and the bottom of the boat , sometimes need a little bead of sealant to stop it .
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Rick's Precision Machine
Prince George B.C.
Machining - Welding - Repairs |
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