FWC kit for Atomic 4, a good idea? - SailNet Community
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post #1 of 21 Old 01-18-2015 Thread Starter
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FWC kit for Atomic 4, a good idea?

Hoping for some more good advice: My '79 A-4 runs well but the temp is quite variable. Reading about the Indigo FWC kit and their new t-stat sounds like cat's meow - but is it foolish to go at fixing things that are not real broken (yet). Last summer was my first with this boat/engine, so I don't have much history at all.
Thanks for your ideas.
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post #2 of 21 Old 01-18-2015
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Re: FWC kit for Atomic 4, a good idea?

Yes it is worth it to convert to fwc

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Re: FWC kit for Atomic 4, a good idea?

thanks Newhaul. Short and to the point. Do you have opinion on which version? Moyer mechanical, Indigo mechanical or electric? Thanks for you thoughts.
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Re: FWC kit for Atomic 4, a good idea?

How old is the A 4, find someone who can tell you how much of the engine block is still left salt water carrodes from the inside out. An A 4 will run almost forever (good engine), FWC is a life saver for the A 4. Runs better and lasts longer. Check out the engine. If it is still good, go for it.
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Re: FWC kit for Atomic 4, a good idea?

Thanks Desert Rat. The engine is a '79, with a "rebuild" 10 or so years ago. Not clear what all was actually rebuilt but there is electric fuel pump, electronic ignition, etc. So far there seems strong support for going FWC. It does run well. Lots of crud came out with vinegar wash at haul out.
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post #6 of 21 Old 01-18-2015
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Re: FWC kit for Atomic 4, a good idea?

Actually I personally I have only worked on the mechanical units and in my opinion the Moyer would be better IMO others may chime in that have experience with the electric units ( with fwc there are several side bennifits like a heat exchanger for domestic hot water also you can run a heater just like in a car( red dot ) for extended season sailing

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Re: FWC kit for Atomic 4, a good idea?

Oh, I sail in Maine. Heater sounds fantastic!
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Re: FWC kit for Atomic 4, a good idea?

DR has nailed the conundrum with questions like this. FWC is better on many fronts, but converting a badly corroded block may not make sense.

The difficulty is in accurately assessing the block to make that call.

EDIT.. it's good and helpful to know where you're sailing.. maybe fill out more detail in your profile?

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Re: FWC kit for Atomic 4, a good idea?

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Originally Posted by Faster View Post
DR has nailed the conundrum with questions like this. FWC is better on many fronts, but converting a badly corroded block may not make sense.

The difficulty is in accurately assessing the block to make that call.

EDIT.. it's good and helpful to know where you're sailing.. maybe fill out more detail in your profile?
He sails in maine and Moyer now casts new a4 blocks so can get entire new engines by buying the parts

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post #10 of 21 Old 01-18-2015
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Re: FWC kit for Atomic 4, a good idea?

I've always understood that RWC engines used in a salt water environment should never be converted to FWC. The salt is so embedded into the internal passages that it will never come out and then when converted to FWC and anti freeze is put into the cooling system, the salt will have a negative reaction with the antifreeze and clog the passages.

My suggestion, find a way that you can easily and frequently flush your engine.
I have a FWC diesel that I flush just about every time I use it. Of course, I'm only flushing the raw water side, but I figure it will buy me extra years before replacing my riser or heat exchanger. Takes me less than 5 minutes to flush my engine.

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Last edited by chuck53; 01-18-2015 at 08:38 PM.
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