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Old 03-28-2008, 03:18 PM
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Default Outboard motor height???

Here's a question for the motor gurus. I think my motor was mounted too low, and I'm now at a point where I think I'm gonna correct it before she is splashed again for the season.

Question 1...Whats the best way of getting it up another hole or 2 without a rack or a lift etc.... I was thinkin of loosening the lower bolts pulling out the uppers and placing a block of wood under the skeg in the driveway. After that I'll jack up the front of the trailer hopefully raising the motor up on the transom.

Question 2...How the heck do I get some fresh sealant in the bolt holes before wrenching it back in place without actually pulling the entire motor off? I was thinking that while it's still supported on the ground, put in 1 of the bolts in the top and seal the other top hole, put in the bolt and nut it loosely, pull another and repeat, pull another repeat.... won't give much room to work but it's better than nothing because I can't pull the motor off completely.

Question 3... My boat sometimes has a tendency to porpoise on a glass flat day unless it's trimmed down a bit more than I think it should need if set up properly, will raising the motor help with this or make it worse?

Thanks for the input, and here's a transom shot while running at normal cruise, around 29 mph (gps)


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Old 03-28-2008, 03:35 PM
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Default Re: Outboard motor height???

James...

It looks like your outboard is mounted on a transom and not a bracket. If that is the case, the cavitation plate should be inline with the keel plus or minus 1 inch either way....If your motor is on a bracket like mine is, the cavitation plate should be up about 1" for every foot of setback. My bracket has a 30" setback and I am at 3" above the keel....Can you measure the distance and get back with us?
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Old 03-28-2008, 03:43 PM
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Default Re: Outboard motor height???

Already measured it, the cav plate is about 5/8" below the keel
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Old 03-28-2008, 03:47 PM
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Default Re: Outboard motor height???

height vs motor is too inaccurate... see ken from propgods method that works 100% of the time:


http://www.propgods.com/forum/Default.aspx?g=posts&t=98
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Old 03-28-2008, 03:49 PM
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Default Re: Outboard motor height???

does that model steiger have a bracket or does the motor sit on the transom?
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Old 03-28-2008, 03:49 PM
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Default Re: Outboard motor height???

Quote:
JeffS - 3/28/2008 3:35 PM

James...

It looks like your outboard is mounted on a transom and not a bracket. If that is the case, the cavitation plate should be inline with the keel plus or minus 1 inch either way....If your motor is on a bracket like mine is, the cavitation plate should be up about 1" for every foot of setback. My bracket has a 30" setback and I am at 3" above the keel....Can you measure the distance and get back with us?
Sorry bad advice!


Has nothing to do with the keel. Has everything to do with where the cav plate is in relation to the water while at cruise.

Posting the picture is correct.

It looks like you can easily go up one notch for sure.

Cav plate should be sklmming the surface of the water at nuetral trim @ cruise. Not riding under the surface at all (like in the pic).


THAT is how you measure the proper engine height.

Mine was where Jefs said it should be in realition to the bottom of hull and it rode under water, which of course, is too low.
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Old 03-28-2008, 03:53 PM
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Default Re: Outboard motor height???

Yep. Ken is the man when it comes to that and his advice has been confirmed by others as well.
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Old 03-28-2008, 04:05 PM
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Default Re: Outboard motor height???

Looks like what I thought is right then, I just hope I can do it myself as I can't see paying someone to do it just to maybe make a change up (or down) depending on the results. Thanks guys

Oh, the motor is not on a bracket...
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Old 03-28-2008, 04:16 PM
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Default Re: Outboard motor height???

Heres my advice. I would guess that you could go up two holes based on that pic. It also depends on the type of prop you are running. You will get away with a higher engine running a 4 blade prop. Merc Rev4's will run actually piercing the surface a little. Going up two holes will raise the motor 1.5". You are currently 5/8" below so 2 holes will get you in the ballpark. You will likely pick up 100 or so rpm on the top end.
As far as raising it, I would just take it somewhere that has a lift. Its a quick job and worth the couple bucks. The problems with resealing the bolts, balancing the engine, etc etc just arent worth it. Pull the engine, clean off the old sealant, inspect the holes, and re-install. If you dont have any backing plates under the bolt heads, now is a good time to add them.
Boats with 0" setback are much easier to figure out. Boats with brackets are much finickier with engine height because the water is hitting the plate at different angles depending on distance back. The water hitting your is still fairly horizontal.
PS. I hope I just gave you good advice, I just popped two Oxycodone as I am passing my very first kidney stone. Just got home from the hospital. My posts should get more interesting as the night goes by.
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Old 03-28-2008, 04:21 PM
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Default RE: Outboard motor height???

Nope, your advise is clear (for the moment). Good luck with that stone, hope its a small one. I'll check back later to see if your PUI yet....

Used a longer straight edge and got a better measurement.. 7/16" below the keel.

Would raising the motor also help with porpoising? Cavitation isn't a problem as I can cut a very sharp turn with speed and not cav at all.
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Old 03-28-2008, 04:23 PM
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Default Re: Outboard motor height???

Quote:
Mr. Demeanor - 3/28/2008 7:16 PM

PS. I hope I just gave you good advice, I just popped two Oxycodone as I am passing my very first kidney stone. Just got home from the hospital. My posts should get more interesting as the night goes by.
add some captain morgan to that and you'd have one of the all time great outboard fights a few years ago on fl sportsman with a very well known chap there...
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Old 03-28-2008, 04:58 PM
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Default Re: Outboard motor height???

If you can't see the cavitation plate (can't see it in the picture), your motor needs to come up probably 2 holes, especially if the cav plate is below the hull bottom. If you have a trailer (or access to one), it's very easy to use the trailer to raise the motor. First, securely chock the wheels front and back so the trailer can't move (with the boat on it of course). Put wood blocks under the motor skeg. Then crank down on the tongue jack to put some upward force on the motor. Remove the upper mounting bolts on the motor and loosen the lower one with the slots. Now just crank the tongue jack down until the upper bolts holes on the motor line up with the upper hull bolt holes and insert the upper bolts, tighten them and the lower ones as well. I haven't address sealant issues, which you need to take care of when refitting the bolts. When all is tight and done, just reverse field with the tongue jack and you are done. I moved my two motors up last fall, and it took maybe twenty minutes, but I didn't need any sealant at all with my bracket. Water test (check the cav plate is uncovered at speed) and test for excess cavitation in tight turns. You may need to go up further. For me, the net result was 15% less fuel usage and slightly better top speed.
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Old 03-28-2008, 05:09 PM
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Default Re: Outboard motor height???

It may help with porpoising but I wouldnt count on it. It wont hurt it. I have a porpoiser as well. The boat hates slick water. I am moving my water tank from the console to a water bladder up front under the fishbox. Move whatever you can forward. Trim tab indicators are great for boats that porpoise a bit. I know exactly where I need to set mine.

Glen, I am opting for beer as I need to pee as much as possible.....TMI?
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Old 03-28-2008, 05:15 PM
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Default Re: Outboard motor height???

Quote:
Mr. Demeanor - 3/28/2008 8:09 PM


Glen, I am opting for beer as I need to pee as much as possible.....TMI?
no matter what libation you use, I really doubt you could ever get as vicious as that interchange got..good luck with the "passing" and wish you a properly numb lower end when it happens...
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Old 03-28-2008, 05:36 PM
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Default Re: Outboard motor height???

I think this may be some sort of record for a thread derail. We are just a liitle off topic although we both are having problems with our lower units :D
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Old 03-29-2008, 12:51 AM
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Default Re: Outboard motor height???

Quote:
Mr. Demeanor - 3/28/2008 5:36 PM

I think this may be some sort of record for a thread derail. We are just a liitle off topic although we both are having problems with our lower units :D


I'd go up 2 holes
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Old 03-27-2010, 07:21 PM
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Save the stones so the Docs can identify the type, and help you avoid more of em. Curious, are you a Diet Coke drinker? I was a pilot with ATA Airlines, drank a fair amount of Diet Coke (Average 3 cans a day) and experienced stones. Had a young surgeon in Chicago convince me to let him basket them out. They used a dirty tool and pushed pseudomonis sp? bacteria directly into my blood through the kidney. 4 weeks IV antibiotics to kill it.
2 up sounds good.
If you know anyone needing a 12k+ hour pilot 51 years old, flown floats(single and multi engine), skis, commuter Captain in the northeast and then worldwide in Boeing 757s and Lockheed L1011s, please call or email dcfrench@metrocast.net
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Old 03-27-2010, 07:37 PM
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Quote:
Originally Posted by jamesbfishin View Post
Already measured it, the cav plate is about 5/8" below the keel
So you need to raise it two bolt holes, not one.

Yes you can do it in your driveway; it's easy.

To seal the bolt holes once you've got it moved up, raise it where you want it, then remove one bolt at a time, clean and apply sealant, and reinstall.

Ultimately, the best motor mounting height will depend on what boat, what motor, what propeller and how and where you boat along with your performance goals, but I can tell you now that that motor is way too low.

What prop are you running now?
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Old 03-27-2010, 08:43 PM
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Hey guys I hate to break it to you, but this thread is two years old.
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Old 05-29-2014, 03:29 PM
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What you think? 25 p rev 4's
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