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28-12-2011, 05:04
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#1
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Building a Bateau TW28
Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau TW28 Long Cabin
Posts: 3,585
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Raw water to keel cooler
I'm considering buying a keel cooler for our boat project. It seems like the right time to do it while we're building the boat. We have a Yammy 4JH-TE that's about 20 yrs old with only 300 hrs on it. I really like the idea of a closed cooling loop but want to retain the water cooled exhaust. The cost for the cooler is just about a grand.
Anybody done anything similar?
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
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28-12-2011, 05:25
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#2
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Marine Service Provider
Join Date: Aug 2008
Location: North Carolina
Posts: 290
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Re: Raw water to keel cooler
The big advantage of having a keel cooled engine is that you dont have to maintain a water pump">raw water pump with a flexible impeller. Your engine already has a closed fresh water cooling system which is cooled via the heat exchanger and the raw water which cools the heat exchanger is never actually in contact with the engine components. As you want to keep the raw water pump, I dont see anything useful with what you propose.
Like everyone else, I have had some bright ideas for projects on my boat. Occasionally I have seen these same ideas in practice on another boat and have been very thankful that I didn't actually go through with the project as I didn't like the results.
Stanley
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28-12-2011, 05:40
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#3
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Registered User
Join Date: Dec 2009
Posts: 2,959
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Re: Raw water to keel cooler
I'd guess that the two systems would fail twice as often. Having both sounds like a disadvantage. Keel cooling is popular in fouled water on slow boats. Like canal craft. Raw water cooling works well enough. Ya just have to learn to love that raw water pump.
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28-12-2011, 05:40
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#4
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Registered User
Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 8,462
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Re: Raw water to keel cooler
Unless you go with dry exhaust I really can't see the advantages Rick.
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28-12-2011, 06:22
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#5
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Building a Bateau TW28
Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau TW28 Long Cabin
Posts: 3,585
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Re: Raw water to keel cooler
We'll be spending the bulk of our time in the canals and coastal waterways so a keel cooler is a definite advantage. Anyone who was on the Hudson river this year would attest to that.
Been reading the service manual for this particular engine and it doesn't look like it'd be a very good candidate for a conversion. I'll keep researching.
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
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28-12-2011, 07:05
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#6
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Registered User
Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 8,462
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Re: Raw water to keel cooler
Rick, what problems did the keel cooler/wet exhaust systems eliminate? You still need to pump raw water into the exhaust system so you need a through hull and strainer and pump.
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28-12-2011, 07:17
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#7
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Registered User
Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,131
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Re: Raw water to keel cooler
Quote:
Originally Posted by DeepFrz
Unless you go with dry exhaust I really can't see the advantages Rick.
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+1 Jacketed dry exhaust would solve your heating need while cruising.
__________________
so many projects--so little time !!
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28-12-2011, 07:30
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#8
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Building a Bateau TW28
Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau TW28 Long Cabin
Posts: 3,585
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Re: Raw water to keel cooler
Quote:
Originally Posted by DeepFrz
Rick, what problems did the keel cooler/wet exhaust systems eliminate? You still need to pump raw water into the exhaust system so you need a through hull and strainer and pump.
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Well a few really. A heat exchanger failure wouldn't be an issue, both cooling loops would be glycol and at over $2K to replace a heat exchanger (if you can even find one) $1K keel cooler is a bargain.
We cruise rivers and canals and hope someday to do the ICW. If you've ever been in the Erie Canal or Hudson river you'll appreciate a keel cooler but with a wet exhaust I'd still need the through hull. A dry exhaust would be better, I understand that but I don't want to have to purchase new materials to build it. I also don't really want a an exhaust stack on the boat either.
We already have our boat heating needs taken care of, thanks Blue Stocking.
Lots to consider I guess.
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
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28-12-2011, 07:54
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#9
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Registered User
Join Date: May 2010
Location: on my boat
Boat: searching...
Posts: 172
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Re: Raw water to keel cooler
Hi,
if proper done I love the keel cooled stuff, much less to worry about. But proper means you get ride of the raw water circuit which calls for a hot exhaust...
If you so concerned about the rivers you may consider another option: Double the raw water filters, either two side by side with a change over switch or even two separate trough hulls/filters in case of a plastic bag over one inlet. Adding a water flow alarm and you have a prober system which is more built to standard. I guess an additional trough hull/filter plus a water flow alarm should be less than 500.
cheers Marco
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28-12-2011, 18:25
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#10
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Registered User
Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 8,462
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Re: Raw water to keel cooler
I like the keel cooler method too, especially if the engine also uses a dry exhaust. But that takes up a lot of space. Oh, the decisions. Good luck, have you been able to do any more work on your ship lately?
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28-12-2011, 18:34
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#11
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Registered User
Join Date: Mar 2003
Location: Philippines in the winters
Boat: It’s in French Polynesia now
Posts: 11,368
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Re: Raw water to keel cooler
Just a note: You will need to inset into the keel or put a protection cover over it to keep it from getting damaged. You will never know if it's damaged until you pull the reservoir cap.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the midst of a storm!
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28-12-2011, 20:31
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#12
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Eternal Member
Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
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Re: Raw water to keel cooler
Most Keel Coolers I have seen are recessed into the hull.
I had a 26foot MWB with a Fernstrum cooler. Used raw water for the exhaust circuit.....worked great....but it has to be zinced well
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29-12-2011, 07:34
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#13
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Building a Bateau TW28
Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau TW28 Long Cabin
Posts: 3,585
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Re: Raw water to keel cooler
Quote:
Originally Posted by DeepFrz
Good luck, have you been able to do any more work on your ship lately?
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Nope. Sitting tight to see what the work/life situation will be in the next few months. I've got enough material to get the hull laminated in the spring and flipped. I have to control my impulse buying now that I may be headed to a fixed income soon.
Thnx everybody for the info on the keel cooler question. I'm still not sure but it looks like it'll be raw water cooled as original just for the sake of cost.
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
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