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Author Topic:   Engine Mounting Height
jokor3 posted 11-21-2003 02:02 PM ET (US)   Profile for jokor3   Send Email to jokor3  
On a 15-foot Boston Whaler boat when is it appropriate to raise engine height? When weight increases aft? When prop pitch is changed? [Was "heighth"]
Bigshot posted 11-21-2003 02:21 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Whenever you want. Engine should be about 2-inches above the top of the transom for the most part. If you are laying on top, raise it two holes and you will notice some improvement.
Peter posted 11-21-2003 02:54 PM ET (US)     Profile for Peter  Send Email to Peter     
If your motor is mounted all the way down, like mine, so that the bracket is laying on the transom top, then you are most likely using the lower blind holes on the motor. The motor well on the classic 15 hull is too shallow to allow use of the the lower bracket non-blind holes when the motor is mounted "all the way down" as stated.

If you wish to raise the motor up off the transom, then I believe you will have to drill some new lower holes in the transom. Alternatively, and probably a better solution, you could remount the motor on a set-back bracket and leave the original transom holes alone. The set-back bracket would allow adjustment of the motor height to find the optimal height setting.

JayR posted 11-21-2003 04:41 PM ET (US)     Profile for JayR  Send Email to JayR     
Sorry joker3 but you spelled out my pet peeve :-)

[i]Heighth[/i] is not a word. Length, width, depth but not "heigth"... It's height. No "h".

Thanks I'm "OCD" and that is one I just can't let go.....
Ya, I know... I gotta work on that...

jokor3 posted 11-21-2003 05:18 PM ET (US)     Profile for jokor3  Send Email to jokor3     
My engine is now mounted in the second hole from the top and I am going to have to loosen it to install new cable because of lack of clearance over the transom for new steering rod to mount. I did not know if when mounted at this "height" if new bottom holes would have to be drilled or not if I moved up one hole. Thanks for previous info.
Peter posted 11-22-2003 12:45 PM ET (US)     Profile for Peter  Send Email to Peter     
If you move up one hole you will need to drill new holes either directly above the existing lower holes or to the side of the lower holes as the blind holes appear to be spaced further apart than the non-blind lower holes.
Bigshot posted 11-24-2003 02:00 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Depends if you are in the blind holes or not. If you can see the lower bolt heads on the lower part of the engine, then raise it up a hole. If you can ONLY see the upper bolts from the rear, then you are in the blind holes and basically screwed.
jokor3 posted 11-24-2003 10:38 PM ET (US)     Profile for jokor3  Send Email to jokor3     
Thanks for the info. I must be in the blind holes as there is nothing showing from the rear except the upper bolts. Don't want to drill more. I will just remove 3 bolts and pivot engine in order to replace the steering cable.
jimh posted 11-29-2003 08:42 AM ET (US)     Profile for jimh  Send Email to jimh     
In the Reference Section of the website you will find an article on the 15-foot hull which shows the mounting situation wherein the lower mounting bolts are located in the fixed (non-slotted) hole so that they clear the splash well bottom. See:

jimh posted 11-29-2003 08:45 AM ET (US)     Profile for jimh  Send Email to jimh     
[Changed "heighth" to "height" --I discovered I was saying this, too, in casual speech! It is now on my list of words to more carefully pronounce. Also on this list is "Illinois". As a child I heard it pronounced with an "s" at the end, and now I must consciously think about how to pronounce it whenever I say it.--jimh]

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