Tartan 27' owner
Join Date: Jan 2008
Thanked 106 Times in 98 Posts
Rep Power: 8
Re: atomic 4 cooling system
Be careful with the designation FWC versus Raw Water Cooled (RWC). Raw water cooled means that your engine is cooled by water pulled from beneath the boat while Fresh Water Cooled really means that your engine is cooled by anti-freeze in a closed loop that mixes in a heat exchanger (HX) with sea/lake water to pass the heat out of the boat. Very confusing terms but very different. A lot of Atomic 4's are set up with RWC as it is the simplest set up, but not the best set up for the engine.
If you have a heat exchanger then your boat is FWC, if no HX then RWC.
Recommend overnight white vinegar flush of cooling passages. 1 gallon of white vinegar is about $2 in the supermarket.
Some A4 owners do operate their engines without a thermostat (T-stat).
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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