Etec 200 HO engine height
 

Took a good look today - cav plate is UNDER the water on plane with the exception of fully trimmed out max / WOT - then it's above water.

Genie Ayre - how does that compare to your set up ?

I'm planning to raise TWO holes - that's about 1.5" -2" and re test speed and overall performance.

I don't know anything about the build of your engine, but I wonder where the water intake(s) are on it. Will raising it up that high put you at risk of no water intake at high speed? Just something to think about.:head:

Mine was lined up with the bottom of the boat-- I raised it--look at picture. No issues with turning or ocean conditions creating cavitation. Mine was underwater too--no longer. sorry about the pictures

Doesn't look much higher than mine - thought I'd see it way up on a jack plate LOL.

Difference is we have different transoms, yours is going to be deeper in the water than mine to start with--mine got moved up to holes from where it was mounted--cavitation plate is now where it should be in the water. You trim enough up and you can make any engine cavatate.

With your engine down all the way, how much higher is your cav plate from the bottom of the hull ?

Bennett, I have always read/heard the cav plate should be 1/4 to 1/2" ABOVE the water's surface when on plane and properly trimmed...which will most likely mean trimming down in turns, which is a normal expectation anyway on a properly mounted OB...

Reel - I'm beating this topic till there's nothing left to discuss !

But I can report I've learned some things by doing so........

Since my cav plate is under water unless at max angle trim, I believe reasonably safe to
say I can go up 1.....maybe the 2nd hole too.

Plan is to do so on Tuesday - and re test all aspects of performance including turns, and WOT speed.

While I talk " top speed " for fun........as I've posted, I consider it a matter of maximum efficiency too. If a boat runs 46mph, and a few adjustments yield 50 mph, then it's likely more efficient across the board.

From the pictures you posted, I would start with two holes up, three if you could. Normal recommendations is you want to set the anti-ventilation plate up one inch above the boat bottom for every two to three inches back. The built in setback on the V21 should allow you to put the anti-ventilation plate at least an inch above the bottom of the boat. you shouldn't have to worry about any water pressure issues unless you put a jack plate on the boat and really set it high. Go ahead and set it higher than you think you need it, if its too high, you answered your question, if it runs good there, then you will always want to know what one more hole up where it needs to be.

Beat on!!..I don't think peeps in general pay close enough attention to this setting and are too afraid of not gettin water to the engine...I agree w/you...EFFICIENCY is the goal, not only for speed consideration, but fuel economy and others as well...Spare is right...w/the 21's setback, you'd have to jack it outta sight to get it too high...