Cavitation HELP

[andrew_ireland]

I was wondering if anyone could shed light on how high the cavitation plate of an outboard could be positioned above the bottom of the transom before it starts cavitating or starts causing problems with the water intake for cooling.
The closest end of the plate is 9 inches from the the transom horizontal wise.

Please help !

Thanks

[Pikey Dave]

Originally Posted by andrew_ireland

I was wondering if anyone could shed light on how high the cavitation plate of an outboard could be positioned above the bottom of the transom before it starts cavitating or starts causing problems with the water intake for cooling.
The closest end of the plate is 9 inches from the the transom horizontal wise.

Please help !

Thanks

The general rule of thumb is to start with the AV plate around 50mm above the keel & work from there. Place a straight edge along the keel & trim the engine so that the AV plate is parallel to the keel & measure the height of the AV plate.

[andrew_ireland]

Originally Posted by Pikey Dave

The general rule of thumb is to start with the AV plate around 50mm above the keel & work from there. Place a straight edge along the keel & trim the engine so that the AV plate is parallel to the keel & measure the height of the AV plate.

Thanks I appreciate the help

[jeffstevens763@g]

this might help

when you say 9 inches how many holes out is the trim pin? assuming manual tilt

[andrew_ireland]

Originally Posted by jeffstevens763@g

this might help

when you say 9 inches how many holes out is the trim pin? assuming manual tilt

The pin is in perfect position so that prop thrust is parallel to the surface of the water, when I said 9inches I'm referring to the distance it will be when I fit a jack plate I recently bought

[Pikey Dave]

Originally Posted by andrew_ireland

The pin is in perfect position so that prop thrust is parallel to the surface of the water, when I said 9inches I'm referring to the distance it will be when I fit a jack plate I recently bought

Why are you fitting a Jack plate? Is your engine too long for the transom?

[andrew_ireland]

Originally Posted by Pikey Dave

Why are you fitting a Jack plate? Is your engine too long for the transom?

Yes engine is too long and i want more speed and better performance putt of it

[jeffstevens763@g]

makes sense now you are about 5 inches too low then?

[andrew_ireland]

Originally Posted by jeffstevens763@g

makes sense now you are about 5 inches too low then?

About 4inches yes