I want to change the Inboard for Sterndrives

Juan Diego Eastman

Juan Diego Eastman

New Member
Jun 12, 2020
12
Boat Info
2006 Sea Ray 38 Sundancer
Engines
MerCruiser TT-VD-8.1 S Horizon V-Drives
I have a 2006 sundancer 38 with internal transmission and I want to install the Sterndrives transmission; my hull has two channels to guide the water to the propellers
I ask? To install Sterndrives, do I have to fill these channels?
 
What he said, +1. It’s not just fiberglass and a stern drives. You may need to swap the engines as well because vee drive engines are installed “backwards” ( fly wheel going forward). A 380 may also be a bit too heavy for sterndrives.

Better to buy a different boat. You might consider another similar sized Sea Ray with pods instead.
 
thanks thanks very mun
Bt Doctur said:
Better off selling it and buying another boat.
Just the cost is prohibitive
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Thank you very much for opinions
the fact is that I own two Yanmar 370 HP diesel with their respective tails and I want to change the current gasoline engines
 
Thank you very much for opinions
the fact is that I own two Yanmar 370 HP diesel with their respective sterndrivers I want to change the current gasoline engines
 
I have no idea on the load you will put on the stern of your boat. You may require some sort of engineering design for strength and boat load balance. Call your insurance provider and ask if they will insure your boat if you make the modifications.
 
northern said:
I have no idea on the load you will put on the stern of your boat. You may require some sort of engineering design for strength and boat load balance. Call your insurance provider and ask if they will insure your boat if you make the modifications.
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Thank you
my Boat is model 2006 sundancer 38´
the 39 Sea Ray sundancer is supplied in the standard model with sterndrive bravo III; I just don't have the keel detail
 

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That will be some fast boat with twin 370HP diesels. If you do it please post your top speed.
 
Thank you
my pot is model 2006 sundancer 38
the 39 Sea Ray sundancer is supplied in the standard model with sterndrive bravo III; I just don't have the keel detail
 
Juan Diego Eastman said:
Thank you
my pot is model 2006 sundancer 38
the 39 Sea Ray sundancer is supplied in the standard model with sterndrive bravo III; I just don't have the keel detail
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Converting a V-drive to stern-drive; Your hull has prop pockets which raises the bilge floor from just behind the V-drive gear all the way back to the transom. Additionally, the rudders go through the center of the prop pockets. Because of the prop pockets you will probably not be able to move the engines back far enough and maintain the correct height for a stern drive arrangement without the engines interfering with bilge floor at the pockets. Additionally, you would have to get the FRP layup drawings but I think you will find that hulls with prop pockets do not have transoms engineered to support the loads from a stern drive arrangement. Just my thoughts.....
 
ttmott said:
Converting a V-drive to stern-drive; Your hull has prop pockets which raises the bilge floor from just behind the V-drive gear all the way back to the transom. Additionally, the rudders go through the center of the prop pockets. Because of the prop pockets you will probably not be able to move the engines back far enough and maintain the correct height for a stern drive arrangement without the engines interfering with bilge floor at the pockets. Additionally, you would have to get the FRP layup drawings but I think you will find that hulls with prop pockets do not have transoms engineered to support the loads from a stern drive arrangement. Just my thoughts.....
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proper this is the discussion!!
very successful Your thanks very munch for your thoughts
how could we get information from Sea Ray
 
sdarc said:
Possible to just install the Yanmars in place of the gas motors? still using the V-Drive layout?
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hello
I initially thought about it
I realized that the ratio in the ZF 63 transmission is 2.5 for the revolutions of the gas engine 4500 to 5000
The Yanmar has fewer revolutions, it would need a transmission with a lower ratio.
I'm thinking this may be a way out
 
I agree with an earlier post... get another boat.

Your boat and hull is designed for V-drives, period.
 
Thank you
that is the objective of the Club
receive all the technical information and knowledge of Sea Ray boat owners so as not to make mistakes
 
Not to be rude but literally have no idea on earth why you would want to go backwards to stern drives. Handling would be poor around the dock(good luck without thrusters) and you can't leave it in the water full time without massive maintenance cost incurred. There is a reason why big boats don't use stren drives.

I sold a 300da to go to inboards and never want to go back unless its some go fast hot rod boat. That is a totally different ball game than what you have.

If you want diesel which i recommend for that size boat convert its current configuration to diesel. That's what the previous owner did with my Tiara. I have Cummins and love them!
 
kevin27 said:
Not to be rude but literally have no idea on earth why you would want to go backwards to stern drives. Handling would be poor around the dock(good luck without thrusters) and you can't leave it in the water full time without massive maintenance cost incurred. There is a reason why big boats don't use stren drives.

I sold a 300da to go to inboards and never want to go back unless its some go fast hot rod boat. That is a totally different ball game than what you have.

If you want diesel which i recommend for that size boat convert its current configuration to diesel. That's what the previous owner did with my Tiara. I have Cummins and love them!
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Thank you for your opinion
all the other colleagues of the Club, who have given their opinion coincide with Your message.
I'm going to abort the idea, think about looking for the right transmissions for the Yanmar using the current system
Thank you
 
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