SABER28

i know this is cavitation caused, but why and how to fix it? these props are new with only 30 or so hours.

Tinkerer

I forget is your boat a single or twin.
If twin you might be crabbing the drives.
It looks to me like you have cavitation on the back side of the drive in front of the prop but only on one side.

SABER28

twins. both props have the same pitting. have not checked the drives for toe but the only thing different from years past is im now going 30 plus mph faster. i also get a slight vibration over 90 mph.

Tinkerer

If you are spinning the props out than the front of the drives should be 1/8 to 1/4 inches farther apart than the center of the prop shafts.
The opposite if you are spinning them in.
If you are crabbing the drives that could cause that burn and the vibration.
On my Scarab I noticed a big difference when I got it right.
You will have to play with the distance - IF you go too far you will feel it.
I should say that I could feel it.

Tinkerer

Is the pitting on the other prop on the other side of the drive.???

Tinkerer

How deep are your props?

SABER28

i appreciate the response. boat is in storage til this weekend . i'll check those things out.

i am spinning them out. drive height is whatever saber set them at new. i dont think they are high especially be todays standards.

SABER28

drives are toe in about a fat 1/16 inch. looks ok to me.

Tinkerer

Adjust the drives so the nose of the drives are 1/4 inch farther apart than the prop shafts.
You are toed in - You should be toed out.
Props spinning out force the back of the drive to the outside.
You have to toe the front of the drives out to counteract this outward force.
You will have to find the sweat spot.
But when You get it right I bet you will gain at least 1 MPH and the cavitation will mostly go away.
I could feel the change in handling on my SCARAB when I got it right.
You are crabbing your drives through the water.

Tinkerer

If you want me to meet you somewhere I will help you dial it in.
Steve.