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lightspeed 08-02-2009 10:07 PM

That Dont Look Like A 3 Inch Short Drive ,,Are You Sure?????????

Philm 08-03-2009 03:39 AM

I will post some pics of the setup on my boat when i get back home next week unless Lightspeed has some of the setup that i havent seen yet.

I stole that picture by digging way back in time through the years and finding your build thread on this boat.

DonRoc 08-03-2009 06:00 AM


Originally Posted by lightspeed (Post 2923492)
That Dont Look Like A 3 Inch Short Drive ,,Are You Sure?????????


The -3 from Imco is the only one with the size not stamped in the machined mating surface above the bullet. But it is the only one where the cavitation plate of the upper is cast differently for prop clearance with the -3 lower. If you look at the side pictures you can see the cavitation plate is not cast straight from front to back it turns up just in front of the prop for clearance. But just to be sure something was not changed I will take a measurement when I gel to work this morning,
Thank You
Don

DonRoc 08-03-2009 06:04 AM


Originally Posted by DonRoc (Post 2923570)
The -3 from Imco is the only one with the size not stamped in the machined mating surface above the bullet. But it is the only one where the cavitation plate of the upper is cast differently for prop clearance with the -3 lower. If you look at the side pictures you can see the cavitation plate is not cast straight from front to back it turns up just in front of the prop for clearance. But just to be sure something was not changed I will take a measurement when I gel to work this morning,
Thank You
Don

Sorry, I reviewed the pictures and you cant see the cav plate clearly. I will measure anyway, and get a better pic of the cav plate
Don

Philm 08-03-2009 06:39 AM

That is definitely a -3 lower, and the cav plate has been modified to accept this lower and aid in prop clearance. If you put a -3 on my upper, the prop would be way too close for comfort. Let me see if i can dig up a picture.

Philm 08-03-2009 06:40 AM

http://i690.photobucket.com/albums/v...9/100_1111.jpg

See what I mean?

DonRoc 08-03-2009 08:06 AM


Originally Posted by Philm (Post 2923586)

You can see your drive is mounted much higher. I will let you all know how it goes after I call Merc Racing. If I have to reglass, I will move the tabs out farther also. The reglass wil be mostly my labor anyway so its not the end of the world. Just a unforseen hassle.

DonRoc 08-03-2009 09:31 AM

Called Merc Racing, I need to reglass....

Philm 08-03-2009 10:13 AM

well that is too bad, but if it will help make the ride more stable, then this is what you will need to do. Hopefully you can knock that out over the winter without too much trouble.

DonRoc 08-03-2009 12:52 PM

Its a week or less project for us. If we were not so busy I would do it now. I will have the motor out this winter anyway. I am going all the way up then I will be able to fine tune on the way down. I would guess I will be able to start with a the propshaft .5" below. Then space from there for the optimum propshaft setup.
Thanks for all the help. I may post pictures of the project.


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