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5HP DuBrie in 16' boat

Old Marine Engine » One and Two Cylinder Gas Inboards » 5HP DuBrie in 16' boat « Previous Next »

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louq
Member
Username: louq

Post Number: 4
Registered: 09-2010
Posted on Tuesday, December 29, 2015 - 08:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I want to run fresh water cooling and was planning to use a couple of 1/2" copper pipes along the keel.
I have a three gallon holding tank for the cooling.
How many 10' copper pipes do you all think I need to keep this 5HP cool. The ocean around here is from 68-85 degrees.
The boat is a very heavy 16' fiberglass Cuban boat.
Thanks,
Lou
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miro
Senior Member
Username: miro

Post Number: 836
Registered: 11-2001


Posted on Wednesday, December 30, 2015 - 09:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Each run ( 10 ft up and 10 ft back) is about 3.2 sq ft of surface are.
I reckon that 2 runs (40 ft altogether) should be more than adequate to keep that engine cooled.
I would connect the 2 runs in parallel.
Generally, most old marine engines are cooled too much even when they are working flat out full throttle.
But I expect that you will not likely be doing that in a 16 ft boat.
The so-called hull speed of a 16 ft displacement hull is about 5 mph. You CAN get the hull to go faster, but you'll be using a heck of a lot of power for almost no increase in speed.

I did some testing on a 16 ft displacement hull several months ago, and I found that the prop was making about 1/2 HP, driven by a ( supposed) 3 HP engine. I think the 3 HP was mostly made up of marketing hype.

Sounds like you'll have a nice cruising boat.

Miro
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louq
Member
Username: louq

Post Number: 5
Registered: 09-2010
Posted on Wednesday, December 30, 2015 - 10:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Miro,
Thanks for the reply.
I was surprised that inlet on the pump on the engine is only 3/8". The boat is 16' displacement hull also, but very heavy (well over 1000 and closer to two). By parallel do you mean to go thru the bottom and Y into two pipes returning and going to a Y before going back thru the hull?
Lou
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miro
Senior Member
Username: miro

Post Number: 837
Registered: 11-2001


Posted on Thursday, December 31, 2015 - 07:47 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Yes, .
You don't need to make the pipe up to the Y any bigger than the pipes that you will be using for the keel cooler. It doesn't need to flow very fast.

I'd also suggest that you use a solution of water and anti-freeze.
That way you won't have to drain it for the winter, plus you'll get some anti-corrosion protection for the innards of your system.

Miro
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louq
Member
Username: louq

Post Number: 6
Registered: 09-2010
Posted on Thursday, December 31, 2015 - 10:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

We are in Florida so the anti freeze will be for corrosion control.
Lou

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