Offshoreonly.com - -3 modification who can do this

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- Drives and Lower Units (https://www.offshoreonly.com/forums/drives-lower-units-217/)

- - -3 modification who can do this (https://www.offshoreonly.com/forums/drives-lower-units/345798-3-modification-who-can-do.html)

endeavour32

03-31-2017 08:09 PM

2 Attachment(s)

The standard SC is the same, then you can also buy the -3 which is notched.
[ATTACH=CONFIG]566003[/ATTACH]
[ATTACH=CONFIG]566004[/ATTACH]

Tinkerer

03-31-2017 08:19 PM

You could just cut flat to the top of the cavitation plate then cut a little higher in the shape of a V ( another words cut a wedge out of the back of the drive just above the cav plate then cut from the bottom or just bend it up and weld around the top and repaint. looking at how thick it is you will have to at least surface cut the bottom where you want to bend it up. You will want to grind off the raised portion underneath.

endeavour32

03-31-2017 08:33 PM

I have a large Delta Unisaw that I think I can use to do some of the cutting, so I get nice clean cuts. Tomorrow I'm going to investigate and see if that will work with the correct blade. D-Day has arrived.

Tinkerer

03-31-2017 08:37 PM

Easy mod with the right tools.
I need to buy a welder that will do aluminum.

bigblockbill

04-01-2017 10:17 AM

Quote:

Originally Posted by Tinkerer (Post 4542593)

The above fits a Maximus prop
I just bolted on the SS cavitation plate and cut off what hung below, removed the plate and then used a orbital sander to clean it up.
After you cut it off you lose the ridge that holds up the back of the cav plate so make sure you have at least 1/2 inch clearance to any prop.
The prop getting on plane causes a LOT of suction and will pull the cav plate down into the prop if it is not high enough. Ask me how I know.

Thanks for the pictures that looks to be easy enough. Question: If your worried about the cav plate getting sucked into the prop can you add a bolt on angle (or block) on top of it right in the middle of the cav saddle and bolt it to the drive?

endeavour32

04-01-2017 03:33 PM

2 Attachment(s)

Step one is done. I just ordered the bits so I can mill this flat with my mill/drill and then I'll start building a new cavitation plate. I was going to just reuse the one I cut off, but I have an idea for a bolt on plate so I don't have to have anything welded.

dereknkathy

04-02-2017 08:06 AM

I guess the angled-up cav plate doesn't act like an upside-down trim tab and try to pull stern lower?

01scarab29

04-24-2017 08:23 PM

-3 Imco lower can bolt to bravo1 upper. cutting clearance for prop is easy with a portable band saw. measure, mark, measure, mark recheck 3 times. I've done 2

Quote:

Originally Posted by bigblockbill (Post 4542454)

I will be curious how this comes out. I am fixing to do the same thing but have not ordered my -3 shorty yet. The research I have found makes it look that a stock B1 upper can be modified pretty easy to fit the -3. I have not yet found any good pictures or write-ups to confirm that though.

bigblockbill

04-25-2017 09:59 AM

Quote:

Originally Posted by endeavour32 (Post 4542848)

Any updates on how this is coming along?

bigblockbill

04-25-2017 10:02 AM

Quote:

Originally Posted by 01scarab29 (Post 4549170)

-3 Imco lower can bolt to bravo1 upper. cutting clearance for prop is easy with a portable band saw. measure, mark, measure, mark recheck 3 times. I've done 2

Cutting sounds easy enough. What did you do for a cav plate solution?

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