CONTINUOUSWAVE

A 25-inch-shaft Honda 225 on my [GUARDIAN 22] boat throws a lot of spray. I think [its mounting height is] a little low. The [anti-ventilaton plate] seems to match with the bottom of the of the [keel] on the [hull at the transom].

[To readers who have a HONDA 225 on a GUARDIAN 22:] which mount holes do you use?

Go up 3 holes.

Sorry, mount on third hole? Or three up mount on 4th.
Thanks a bunch

bolts in the 4th hole counting down from the top.

When done, there will be 3 empty holes above the bolt.

Please learn how to describe engine mounting height by reading the article about ENGINE MOUNTING HEIGHT at the top of this forum.

viewtopic.php?f=7&t=739

If a person says "raise the engine three holes" he means to increase the mounting height by three holes or 2.25-inches. The standard engine mounting hole spacing is 3/4-inch, and "three holes" is three time 3/4-inch or 2-1/4-inches. Many engines only have four sets of holes so the highest possible mounting is three-holes-up. If an engine has five sets of mounting holes, then the highest mounting is four-holes-up. I don't know why I am repeating this. It is all explained in the ENGINE MOUNTING HEIGHT article. Please go read it.

Do not describe mounting height by counting holes in some direction and describing where a bolt is positioned. It can be very confusing.

What [position relative to lowest possible position and counting the distance using the "hole" unit of 3/4-inch and measuring up] was [the HONDA 225] mounted in originally?

My HONDA 130 engine is mounted two-holes-up; mounting three-holes-up was too high. I know--I am telling you about a different engine and different hull.

The GUARDIAN 22 hull is similar to the more common OUTRAGE 22 hull, but the GUARDIAN 22 will be heavier.

Many find that mounting an engine at one-hole-up or two-holes-up will work very well with modern propellers that can tolerate higher engine mounting heights.

Without having a clear description of the present engine mounting height on your GUARDIAN 22, recommendations for a relative change of engine mounting height do not make much sense.

If the engine is now mounted in the lowest position, the engine mounting height can be raised to at least one-hole-up and possibly two-holes-up as an initial starting point for evaluation of the change in engine mounting height and how it will affect the handling of the boat

The relationship of the engine anti-ventilation plate to the deepest point of the keel at the transom really is not a particularly important distance, and attempts to define engine mounting height with those dimensions are generally useless.

A better metric for engine mounting height is to observe of the flow of water over the gear case when the boat is operating a upper speed and is on plane and the engine trim has been set, with the general goal that the anti-ventilation plate should be visible, and parallel to and running at the top of the water or even in some cases just out of water.

The ability for higher engine mounting heights to be useful is related to many factors, including

• the propeller design and how well it can run in airy water or with blade tips out of the water
• the water conditions normally encountered, that is calm water or rough water
• the desire to sacrifice other handling characteristics in order to obtain maximum possible top speed operation in calm water
• the shape of the bullet on the gear case
• the hull design and weight distribution on the hull which will affect the stability of the hull on plane and eliminate oscillating of the bow on plane (called porpoising).

I’m currently 3 holes up with my Honda 225 on my 1979 Outrage 22.

I’d actually consider going up to the last hole, but am also thinking about putting a bracket on the boat so I’ll restart the “where to mount the engine” conversation at that time.