My 1978 boat has the set-up Rich describes. I always figured it was just a design hold over from the A4s.
Never found the blower to be useful, but I have kept it intact and functional just in case. Steve Thomas C&C27 MKIII Yanmar YSB12 Port Stanley, ON ----- Original Message ----- From: Rich C&C To: 'Pierre Tremblay' ; cnc-list@cnc-list.com Sent: Friday, September 28, 2012 10:24 AM Subject: Re: Stus-List Engine compartment ventilation Salut Pierre! Many C&C's with diesel engines have engine compartment ventilation. The design of these vent systems is essentially the same as those on the gas powered boats with a pair of cowl vents on the stern connected to plastic vent hoses inside the compartment. One hose generally terminated at the bottom of the compartment and the other higher up. There is generally a 12V in-line extraction fan in one of the hoses. This arrangement serves well, but usually see little regular use on the diesel powered boats. You don't say what your problem is that causes you to consider putting in a vent system. The engine will consume a few hundred cubic feet of combustion air per minute and sucks that air from the engine compartment which needs to be vented somewhere to provide makeup air. Much of the engine heat will be reduced along with the ingested combustion air. A well-running diesel will not give off much in the way of smells or fumes and neither should be very noticeable. If you are experiencing enough of either to make you take notice, I suggest you look for the source of the problem before applying a band-aid such as a blower. The boat has been operating for 24 years without a blower system and should be able to continue that way. I am not saying ventilation is not a good thing from both a heat and fume dissipation point of view, but it should not be needed if all is working ok. To see what C&C boats have and to get some ideas of what you could do, I suggest looking at pictures of various C&C's on www.Yachtworld.com. Based on a quick look at your boat, if I was to install a vent system, I think I would look at mounting a stainless low profile scoop vent facing backwards on the outside of each winch coaming as far back as practicable towards the stern. See http://ca.binnacle.com/Ventilation-Misc-vents/c199_213/p1530/PERKO-1312-COWL-VENT-3-INCH/product_info.html Hope this is usefulJ Rich Knowles INDIGO - LF38 (with vents!) Halifax, NS
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