cavitation problems

i just bought a 1996 26' billfisher i have the 200hp volvo diesel and 290 dp out drive with a-4 props ive have a bad cavitation problem, the power trim motor was bleeding out thought that might be the problem so i replaced it and i had my props rebalanced they said they wrere ok even that they are pretty old i have the big kd transducer thats mounted center of the keel but i think its up far enough that it wouldnt matter im thinking mabe the prop hubs are spun , the boat dont cavitate until i run for about 20 minutes , anybody have any input on this problem id appreciate it

Sound like you spun a prop to me. Try pulling your props and painting a line from the hub to the prop, then run the boat again. If the line on the hub doesn't match the line on the prop, your hub is spinning.

Mike

thanks mike is your boat set up pretty much the same do you run a-4 props or a-5

I have an older 23' with a 40 engine. Most of the 26s with the 41 are running A4 or A5 props.

A3s or A4s for the 41; depending on the Outdrive ratio either 1.92 or 1.78

If you're not running with the outdrive trimmed all the way down (-2 to-5), you're going to get cavitation at speeds less than 16-18 kts.

thanks for that

Hi Poco Loco saw your boat on K dock Looks like we are getting a nice crowd of Blackmans on J & K dock
Welcomae aboard.
Jeff
"Patron"