SD build ? Maybe

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SD build ? Maybe

Postby threedogs » Fri Oct 18, 2013 4:39 pm

I'm thinking of building a surface drive using my HD 88 twin cam motor. I went to an S&S 124" and have this one just sitting in my garage. Any opinions ?
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Re: SD build ? Maybe

Postby Mark F. Cheney » Fri Oct 18, 2013 6:20 pm

I have read your posts since you post often. You seem like a competent and crafty guy. I personally don't understand a surface drive for a duck boat. My preference is for a long tail with a belted reduction to the drive shaft. It gives long tail convenience with the advantage of the surface drives drive shaft reduction. Isn't your HD engine a bit much for weight on a boat transom? I haven't done a conversion like this takes, but I would think that a new conventional industrial motor would be cheaper than a HD conversion. It would be for me. However the joy in a project is often as much in the journey as it is in later having it completed. Good luck and enjoy the journey.

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Re: SD build ? Maybe

Postby CountryRN » Fri Oct 18, 2013 6:35 pm

It should work. It's gonna be loud as hell. Check the youtube link below.
http://youtu.be/4rd2d3PQSiA
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Re: SD build ? Maybe

Postby threedogs » Fri Oct 18, 2013 7:54 pm

Mark F. Cheney wrote:I have read your posts since you post often. You seem like a competent and crafty guy. I personally don't understand a surface drive for a duck boat. My preference is for a long tail with a belted reduction to the drive shaft. It gives long tail convenience with the advantage of the surface drives drive shaft reduction. Isn't your HD engine a bit much for weight on a boat transom? I haven't done a conversion like this takes, but I would think that a new conventional industrial motor would be cheaper than a HD conversion. It would be for me. However the joy in a project is often as much in the journey as it is in later having it completed. Good luck and enjoy the journey.

Mark F. Cheney



Mark, as close as I can figure the HD motor weighs between 120 and 150 lbs. The 50 hp merc that I have on this boat is over 200 lbs. I know that the frame would contribute to the weight but I think it can be done under 180 lbs.
The reason for a SD would be because I haven't heard of one yet! I have to have something to do til I die or I'll make more enemies on these forums than I have already. :yes: It just seems like the thing to try but maybe not. Should be fun but probably a little or lot of frustration.




CountryRN, that video was pretty cool, I wonder what the speeds were? Thx for the link.
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Re: SD build ? Maybe

Postby T Man » Fri Oct 18, 2013 10:50 pm

CountryRN wrote:It should work. It's gonna be loud as hell. Check the youtube link below.
http://youtu.be/4rd2d3PQSiA


Hell



Yes.




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Re: SD build ? Maybe

Postby Mark F. Cheney » Sat Oct 19, 2013 1:59 pm

Three Dogs:

I understand the "itch to do" completely. It has motivated much of what I have done in my life. And I have had a great ride, at that.

Currently I am working on a really light weight mud motor that would have a little push, be reliable, and weigh about 35 lbs. I have got at least 5 years in this and several small motor purchases of various types. I am also getting close to finishing a solid long tail with a drive shaft reduction using a larger engine - say 14 to 25 HP. Good luck with your HD.

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Re: SD build ? Maybe

Postby GMag10 » Tue Oct 22, 2013 11:32 am

Do a search on MMT. A very talented indivdual had taken a similar engine and put it on a GTR frame, keeping the reverse and clutch. If you wanted to just do a simple surface drive with no reverse, it will not take a lot more than building one for a 10 hp. You will have a bit more work adapting a drive pulley to the engine output. The other projects using similar engines have had to add additional cooling.
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Re: SD build ? Maybe

Postby threedogs » Tue Oct 22, 2013 1:42 pm

GMag10 wrote:Do a search on MMT. A very talented indivdual had taken a similar engine and put it on a GTR frame, keeping the reverse and clutch. If you wanted to just do a simple surface drive with no reverse, it will not take a lot more than building one for a 10 hp. You will have a bit more work adapting a drive pulley to the engine output. The other projects using similar engines have had to add additional cooling.



Well, I fell for it. Every time I go to that fkn site I get a virus and I got another one this time. If it's already been done then I don't want to build one anymore.
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