Impeller cavitation?

[Trm1765]

I finally put the boat in the water today after installing new impellers. Each motor sounds normal when running individually, but when both engines are started it vibrates and makes bad noise just like when not in the water. (I was in the water)
I am wondering if I got impellers on wrong side? Or maybe wrong impellers? I can't figure out why they wouldn't run good when both running but do run normal individually??

 

[Trm1765]

As it turns out, there are side specific impellers,, and I have two starboard and zero port side,, which apparently causes a bunch of cavitation when running together???? Back to the backorder table I go....

 

[dan144k]

Hi trm
I sent you a private message. I may be able to help you out. I have some spare parts.

 

[Trm1765]

Problem solved with a huge shout out to Gulf Shores Powersports for selling a port side impeller to an out of water boater from Minnesota.. Several other dealers told me they had one but wouldn't sell it to me because they only had one.
I still have a hard time understanding how it could be so drastically bad with just a little different pitch.
All good now, in the water and running well.