Breakaweigh has a vented loop. Yanmar engine. Dan Breakaweigh C&C44 Halifax NS
Sent from my iPhone > On Jan 30, 2018, at 4:53 PM, Patrick Davin via CnC-List > <cnc-list@cnc-list.com> wrote: > > Thanks all. Rick, that's the sort of nightmare story I'm hoping to avoid! > When you say corners were cut "on the exhaust elbow, hose routing, and the > siphon break" do you mean the prior engine had those things installed in a > poor manner, or that a siphon break wasn't installed? > > I haven't heard from any Landfall 38 owners about layout (where the loop is > mounted), so if any of those folks have one I'd still be interested in that. > > I did wonder about temperature. I think the exchanger raw water output is not > as hot as the exhaust? Forespar says Marelon is okay to 170F. Interestingly > the Scot loop says 140 F max temp, which is pretty low. Maybe because their > vent parts are made out of plastic Delrin, or they're just being > conservative. In the diagram Paul sent me they show the loop in use between > the exchanger and exhaust elbow, so obviously they intend for it to be used > in that role. > > I guess most people do the loop between the exchanger outlet and the exhaust > elbow because it's easier to install there than in between the water pump and > the exchanger inlet. And presuming the water is below 170F then Marelon is > okay in either location. > > I agree the exhaust transom exit is probably the greater risk in most cases. > I already have an ample exhaust hose rise there though, and the waterlock > muffler should prevent siphoning afaik. It'd take a lot for following waves > to push past a 3 foot rise in a 1.5" hose and then through an exhaust riser. > I'd consider an exhaust lock (inline, in an accessible location) if I'm > worried about that. Hanging from the transom in ocean swells to insert a plug > doesn't seem viable. > > -Patrick > '84 C&C LF38 > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray >
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