Height of cavitation plate.

[rolmops]

My 1957 35 horse RDE 19 M seahorse is currently sitting on a 1957 Herter's 16 foot flat bottom boat and the cavitation plate sits about 4 1/2 inches under the bottom. <br />With a 10 3/8 x 13 1/4 prop it runs at 3400 rpm and with a 10 1/2 x 11 3/4 it gets up to 4000 rpm.<br />WOT is supposed to be 4500 with a 10 3/8 x13 1/4.<br />How far can I bring up the engine, if at all, and still be safe from cavitation and will it improve performance?<br />Thanks for any thoughts and advice.

 

[snapperbait]

Re: Height of cavitation plate.

The cavitation plate should be even with the bottom of the boat....Bring it up 41/2"...

 

[snapperbait]

Re: Height of cavitation plate.

And yes it will improve Performance because of reduced drag.. You should then be able to reach WOT...

 

[brother chris]

Re: Height of cavitation plate.

I agree with snapperbait. My 55hp was 4" below my transom, and I raised it up, wow does it make a difference. Although the jury is still out as to where the cavitation plate should be. Some people will tell ya it can be anywhere between 0- 1 1/2" below the transom. I think anywhere within 1" should do it. It worked for me anyways. <br />Happy boating rolmops