Lower unit

Fear morgan

Cadet
Joined
Jun 28, 2016
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10
I have a 1995 Chris craft concept 19 with a 5.0 fl Volvo penta with a sx cobra drive, 1.66 ratio can any help me on what lower units will work as I have taken mine off. Thanks F8A64A75-8212-4E2B-8B7D-6BF38C5CDB8F.jpegEF6BD548-5F43-4FC1-A5D0-FFB414745DBB.jpeg
 

Fear morgan

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Jun 28, 2016
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10
I see I probably should’ve put this in Volvo penta part of the forum if someone could move it there
 

Horigan

Senior Chief Petty Officer
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Jun 12, 2016
Messages
689
Any Volvo SX-M or OMC Cobra SX lower unit with that ratio will work. I believe a '95 or '96 DP-SM duo prop would also work if you can find it, but I don't know what ratio you would need to change to for a duo prop. Someone here would know that.
 

Fear morgan

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Jun 28, 2016
Messages
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a guy is telling me there are 2 different ones, does anyone know what style mine would be? A copper tube goes there. Really wish I had pulled it apart before going into storage
 

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Horigan

Senior Chief Petty Officer
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Jun 12, 2016
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689
I think you need 1.66. The other is a ~20% different ratio. That's a lot to try to compensate with a prop change.
 

Fear morgan

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Jun 28, 2016
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Right, but some are telling me that gearing is in my upper so the lowers are the same, need a merc, I can’t find any 1.66 with the same I’m guessing the pipe is a water pick up. They all bolt on and mine just seals up tight.( the copper pipe)
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
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Jul 23, 2011
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50,360
if its an SX, the gearing in the top transmission is all the same across the board and the gear ratio change from 4-6-small 8-large 8 is all done in the lower gear set.
 

Fear morgan

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Jun 28, 2016
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10

ok so then how can this be for either or? If the other 1.97 I sent won’t work why would this one?
 
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