Originally Posted by Yachts66
Not all at. There are many advantages to keel cooling
, just don't use water and keep in mind that unless you are going to go with a loud and hot dry exhaust system you'll still need to pump salt water
into your wet exhaust system to keep it quiet and cool.
Every large work boat I've been on has keel cooling and a dry exhaust, as I do on my boat, on a steel
boat you don't need to worry about where the exhaust pipe exit the hull
, though weld a stainless plate 3-4" around cause the paint
might not take the heat to well. Some of the main reasons for a dry exhaust is to limit the amount of holes in the hull
, and to do away with having an impeller pump that will fail on you, which would melt you exhaust hose, best just do it right to begin with. My exhaust, which is a stainless 1 1/2" sched 40 pipe, goes through the transom and right into the water, maybe at some point I'll put a muffler
in but so far it's not that bad for noise
, worse inside the boat than outside, and the sched 40 pipe will take a long time to rust out if it does at all.
50/50 mis antifreeze will prevent rust in the keel cooler
, mine just has the shop primming that the plate came with, but you could always scale it and spray the paint in, either that or use something like a mop to paint it with, it doesn't really need to be pretty.
That's a large area 13x1x3 feet you might be able to section of an area cause that's a lot of antifreeze to buy, mines about 15 gallons total for my 3 cylinder 20hp, though it's in the skeg which is a fairly long narrow fully immersed steel
compartment, so make sure that there is adequate surface area surrounded by cold salt
water. Also weld a stainless pipe down to the bottom of the tank for the pickup and put the return at the top to insure that you don't ever suck up any air which can block the system from circulating and overheat the engine
, this is one problem with the whole keel cooling system getting the air lock out of the system but once you've got it figured out you shouldn't have any problems, unlike system Dependant on impeller pumps and heat exchangers salt
water, no mre plastic bags killing your engine