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hi


You are replying to:
Landry
Posted 9/3/2009 8:39 PM (#397884)
Subject: cavitation plate height at full speed




Posts: 1023


In the spring I got some advice on this site from VMS on how to raise my 70 hp Johnson 4 stroke (thanks). It is mounted too low on my 1650 Fish hawk. The cavitation plate (the one immediately above the prop) is running 3" under water at full speed. I am planning on raising the motor 2 holes. This will put it one hole from the highest setting on my transom. Should the cav plate be at the surface or slapping the top? I think so from what I have seen on the web, but that would put the prop barely below the surface at full speed - which I am having a hard time wrapping my head around.

My boat does 32 mph with 5200 rpm max. This top end speed seems a little low for this set-up. It has a great hole shot though. The minimum recommended wide open throttle is 5200 and the max is 5800.

Feedback/opinions would be appreciated! Thanks!

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