Francois, I replaces the exhaust system on my 1987 35mk3 a few years ago, and based on that here are my comments:
1. of course the mechanic is going to yell at you, because 1) he cannot be on record as going against what his manufacturer is publishing and perhaps 2) he wants you to employ *him* to do this job. 2.I think *part* of the current school of thought on going to 2" has to do with muffler availability. 2" inlet and 2" outlet is pretty normal and easy to purchase muffler size. 2" inlet and 1.5" outlet is not. For me I could only find it as a very pricey special order. And you don't mention if you are replacing the muffler. Mine (which was the same age as yours is now when I replaced it) was starting to rust out and needed replacement, in addition to the cracks in my exhaust hose. If you have the hoses out (one of the harder things to do in this job), you might strongly consider replacing your muffler. Unless yours is already non-metallic. 3. the problem of going "under" the fuel tank can be solved by going "over" the fuel tank. That's the route mine goes. Out of the top of the muffler, with a gentle curve to horizontal and over top of the fuel tank, then sloping down to the hull fitting. Yes, moving to 2" means perhaps going to a 2" hull fitting, but that's not soooooo bad. The old fitting is 23 years old. Why not replace it? And boring the hole out to 2" from 1.5" is easy with sanding drums and a few hours of time. I chucked a 1.5" sanding drum into my hand drill with 60 grit paper, and a few sheets of sandpaper and some time later, had a 2" hole. Easy peasy. -Keith M C&C 35-3 Beyond the Sea. -----Original Message----- From: Jean-Francois J Rivard [mailto:[email protected]] Sent: Thursday, August 22, 2013 5:17 PM To: [email protected] Cc: [email protected]; CnC-List Subject: Re: Stus-List 1 1/2" ID Exhaust hose Good afternoon gents, I'm the new kid on the block. I purchased Steven Thorne's 34+ about 6 weeks ago and my family an I are enjoying the boat tremendously. I've also been busy waxing and cleaning as well as fixing a bunch of little things that needed attention. My question is : Is it really such a bad idea to replace the original 1 1/2 ID exhaust hose with an identical hose? (And not going to 2" as per the " current school of thought" ) Prior to purchase, The surveyor noted hairline cracks at the loop before discharge with some evidence of very minor leaks. I finally got around to disconnecting it and wrestling it out of the boat. It appears to be original with and internal diameter of 1.5 inch and 12 feet in length. I checked with my mechanic to see if he had one on hand and he scolded me for even considering replacing it with another 1.5 inch diameter instead of the "Prescribed" 2 inches stating that I was killing the engine with excessive back pressure. The thing is: This boat is clearly designed for a 1.5 inch hose. * The stern discharge exhaust through hull is molded as an integral part of the hull and is 1.5 inch in diameter. ( I saw it during the survey while the boat was out of the water). * Also, there's no way a 2 inch diameter hose would fit between the bottom of the fuel tank and the hull where it runs from the muffler to the stern. To get a 2 inch hose through you'd have to lift the tank and squeeze it back in place while compressing the hose. * There are no hard bends or kinks, it's a straight run to the loop before the integrated hull discharge The engine runs fine, the boat makes 7 knots at 2,800 rpm's or so and get up to hull speed (about 7.5) when you give it full throttle for while so for all appearances, it's making all the power it's supposed to make. All this after 23 years of "being killed" by back pressure. I might consider reworking the exhaust situation this winter when she's on the hard for a bottom job but for now, there's no way I'm missing on precious weekends on the lake with the family for a very remote possibility of an issue with this. Am I taking such a risk? Thanks in advance, Francois Rivard 1990 C&C 34+ "Take Five" Inactive hide details for cnc-list-request---08/22/2013 12:05:42 PM---Send CnC-List mailing list submissions to cnc-list@cnc-lcnc-list-request---08/22/2013 12:05:42 PM---Send CnC-List mailing list submissions to [email protected] From: [email protected] To: [email protected] Date: 08/22/2013 12:05 PM Subject: CnC-List Digest, Vol 91, Issue 80 Sent by: "CnC-List" <[email protected]> ________________________________ Send CnC-List mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of CnC-List digest..." Today's Topics: 1. Re: test (Andrew Burton) 2. Re: test (Rick Brass) 3. Re: test (Andrew Burton) 4. Re: test (Frederick G Street) ---------------------------------------------------------------------- Message: 1 Date: Thu, 22 Aug 2013 10:45:25 -0400 From: Andrew Burton <[email protected]> To: [email protected] Subject: Re: Stus-List test Message-ID: <CAGAfpmZdQ64GCEZrcR_d=QWE=90ZX8+AKDYBm3m=batx2_8...@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" I think the number you're looking for is 42. Andy On Thu, Aug 22, 2013 at 10:29 AM, Della Barba, Joe <[email protected]>wrote: > 1**** > > ** ** > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com [email protected] > > -- Andrew Burton 61 W Narragansett Ave Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ phone +401 965 5260 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/2013082 2/9f3b1ebb/attachment-0001.html> ------------------------------ Message: 2 Date: Thu, 22 Aug 2013 10:58:39 -0400 From: "Rick Brass" <[email protected]> To: <[email protected]> Subject: Re: Stus-List test Message-ID: <00c101ce9f48$16bb2bf0$443183d0$@net> Content-Type: text/plain; charset="us-ascii" Good one, Andy. Now the question in my curious geek mind is whether you've read the Hitchhiker's Guide to the Universe, you know a lot about General Relativity, or both? Rick Brass From: CnC-List [mailto:[email protected]] On Behalf Of Andrew Burton Sent: Thursday, August 22, 2013 10:45 AM To: [email protected] Subject: Re: Stus-List test I think the number you're looking for is 42. Andy On Thu, Aug 22, 2013 at 10:29 AM, Della Barba, Joe <[email protected]> wrote: 1 _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected] -- Andrew Burton 61 W Narragansett Ave Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ phone +401 965 5260 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/2013082 2/5c79ca50/attachment-0001.html> ------------------------------ Message: 3 Date: Thu, 22 Aug 2013 11:32:06 -0400 From: Andrew Burton <[email protected]> To: [email protected] Subject: Re: Stus-List test Message-ID: <cagafpmydmocjfe3h8vjmavypdkbhkkdqchnjqnyldhhpeoy...@mail.gmail.com> Content-Type: text/plain; charset="windows-1252" The former. And google helped me find out what you are talking about with the latter. Facinating! I wonder if Douglas Adams knew that? Andy On Thu, Aug 22, 2013 at 10:58 AM, Rick Brass <[email protected]>wrote: > Good one, Andy.**** > > ** ** > > Now the question in my curious geek mind is whether you?ve read the > Hitchhiker?s Guide to the Universe, you know a lot about General > Relativity, or both?**** > > ** ** > > Rick Brass**** > > ** ** > > *From:* CnC-List [mailto:[email protected]] *On Behalf Of > *Andrew Burton > *Sent:* Thursday, August 22, 2013 10:45 AM > *To:* [email protected] > *Subject:* Re: Stus-List test**** > > ** ** > > I think the number you're looking for is 42.**** > > Andy**** > > ** ** > > On Thu, Aug 22, 2013 at 10:29 AM, Della Barba, Joe < > [email protected]> wrote:**** > > 1**** > > **** > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > [email protected]**** > > > > > -- > Andrew Burton > 61 W Narragansett Ave > Newport, RI > USA 02840 > http://sites.google.com/site/andrewburtonyachtservices/ > phone +401 965 5260 **** > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com [email protected] > > -- Andrew Burton 61 W Narragansett Ave Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ phone +401 965 5260 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/2013082 2/3b56ba78/attachment-0001.html> ------------------------------ Message: 4 Date: Thu, 22 Aug 2013 10:58:04 -0500 From: Frederick G Street <[email protected]> To: [email protected] Subject: Re: Stus-List test Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1" Andy, you beat me to it! Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI On Aug 22, 2013, at 9:45 AM, Andrew Burton <[email protected]> wrote: > I think the number you're looking for is 42. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://cnc-list.com/pipermail/cnc-list_cnc-list.com/attachments/2013082 2/4345888a/attachment-0001.html> ------------------------------ Subject: Digest Footer _______________________________________________ CnC-List mailing list [email protected] http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com ------------------------------ End of CnC-List Digest, Vol 91, Issue 80 **************************************** _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected]
