Yep, the RWC engines usually have a lower temperature thermostat (and associated sensors/alarms) so that there is absolutely no chance of localize boiling inside the engine. Boiling causes deposits in the engine which can clog passages. Lower temp also reduces the speed of corrosion.
FWC engines have a higher temp thermostat so that they can be more efficient. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Sun, Jun 14, 2020, 18:12 David Risch via CnC-List <cnc-list@cnc-list.com> wrote: > I got one for you. Bought a 40 that was a 3QM 30 from the lakes. Came > south here and was retrofitted with Sendure heat exchanger. > > So I buy the boat. And immediately notice the temp sending unit is > cracked. Go to the parts counter and provide the engine model and get the > part. > > Install the unit and notice the engine overheats a higher RPMs. Start > doing the overheating diagnosis dance. > > Fixed, or replaced everything. Still over heating. In desperatation I > drop a temp sensor in the exchanger while running the boat hard to overheat > her. > > "Overheats" at 140°. It then hits me. RWC engine model got me a RWC temp > sensor which goes off at 140°. > > Switched it out. Problem gone. > > Sent from my Android. Please forgive typos. Thank you. > > ------------------------------ > *From:* CnC-List <cnc-list-boun...@cnc-list.com> on behalf of Ronald B. > Frerker via CnC-List <cnc-list@cnc-list.com> > *Sent:* Sunday, June 14, 2020 1:23:56 PM > *To:* Josh Muckley via CnC-List <cnc-list@cnc-list.com> > *Cc:* Ronald B. Frerker <rbfrer...@yahoo.com> > *Subject:* Re: Stus-List CnC34-Anything to pay attention to? > > Good to know the terms. I was aware of the different cooling mechanisms, > but unaware of the terminology. > Quite frankly I thought fresh water cooled referred to non-salt water. > Thanks folks, > Ron > Wild Cheri > C&C 30-1 > STL > > On Saturday, June 13, 2020, 11:11:33 PM CDT, Josh Muckley via CnC-List < > cnc-list@cnc-list.com> wrote: > > > Yes. If you have a radiator cap and glycol coolant then it is freshwater > cooled. > > > > On Sat, Jun 13, 2020, 23:30 Ronald B. Frerker via CnC-List < > cnc-list@cnc-list.com> wrote: > > So when the water from the engine, like my Universal, goes through a heat > exchanger where lake/bay/ocean water is pumped to cool the engine water, > that's referred to as FWC? > Ron > Wild Cheri > C&C 30-1 > STL > > On Saturday, June 13, 2020, 02:41:09 PM CDT, Gary Nylander via CnC-List < > cnc-list@cnc-list.com> wrote: > > > FWC is fresh water cooled, RWC is raw water cooled. If you have a 2QM like > I do, it is Raw Water Cooled – water from the lake/bay/ocean is pumped > through the engine for cooling and merged with the exhaust and expelled. > > > > Gary 30-1 > > > > Fro*m:* CnC-List <cnc-list-boun...@cnc-list.com> *On Behalf Of *Ronald B. > Frerker via CnC-List > *Sent:* Saturday, June 13, 2020 2:52 PM > *To:* Della Barba, Joe via CnC-List <cnc-list@cnc-list.com> > *Cc:* Ronald B. Frerker <rbfrer...@yahoo.com> > *Subject:* Re: Stus-List CnC34-Anything to pay attention to? > > > > Pardon my ignorance, but what is FWC/RWC? > Ron > Wild Cheri > C&C 30-1 > STL > > On Friday, June 12, 2020, 01:11:53 PM CDT, Della Barba, Joe via CnC-List < > cnc-list@cnc-list.com> wrote: > > > > > > I used to sail on a 34 that had the 2 cylinder Yanmar. That thing would > shake the entire boat. Some had Atomic 4s I think, which are much smoother, > but any original A4 that is not FWC is living on borrowed time at this > point. Actually ANY RWC engine from the 80s not in a fresh water lake is. > > > > Joe > > > > -----Original Message----- > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of John > and Maryann Read via CnC-List > > Sent: Friday, June 12, 2020 1:41 PM > > To: cnc-list@cnc-list.com > > Cc: John and Maryann Read <johnprea...@gmail.com> > > Subject: [EXTERNAL] Re: Stus-List CnC34-Anything to pay attention to? > > > > Owned our 82 for 21 seasons. Absolutely love it. Original Yanmar 3GM > which is just the right power (do not recommend a smaller engine) No major > design or build issues just issues of being such a tender age :-) Of > course get a competent survey of hull rig and all systems. Our main hatch > cover had delamination of core as screws around the edge went through the > balsa core, they leaked and core rotted. Removed cover, installed solid > glass around edges for screws, new balsa and glass, reinstalled. Filled 2 > screw holes in deck with epoxy reassembled and no more leaks :-) > > Sails like a dream. Very sensitive to trim and weight distribution. > Races with the best of them need a crew of 6 or 7. Easily cruises for 4. > 2 can easily sail her. Is designed for light airs but can handle high > winds and seas well. The designer Rob Ball has one - need I say more? > Contact off list if need anything else. > > > > > > John and Maryann > > Legacy III > > 1982 C&C 34 > > Noank, CT > > > > > > > > _______________________________________________ > > > > 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 > > > > > > _______________________________________________ > > > > 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 > > > _______________________________________________ > > 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 > > _______________________________________________ > > 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 > > _______________________________________________ > > 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 > > _______________________________________________ > > 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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