[C38] Exhaust Riser

[S Orton]

Steve S,  The original Cat 38 design of heavy cast steel pipe fittings is a very poor design- to have all this vibrating weight cantilevered off the exhaust manifold, which is going to fail at a threaded pipe joint.  Catalina has redesigned the riser to an all welded fitting of stainless for a price about $200 (6 + years ago) as I remember.  I would give Catalina a call for price and bump that against a local fabrication shop.  The redesigned part is of very simple construction- schedule 40 ss pipe, with welded mitered 90 degree bends, welded to a 3/8 ss plate (as I remember), which is bolted to the exhaust manifold.  The part weighed only about a 1/4 of the original design, with no threads to fail in fatigue.  My big problem was hooking up the "flexible" hose to the water muffler.  As your picture shows there is not much room allowed for the hose to clear the underside of the sail locker and enter hose fitting to the muffler.  I think mine was worse than what you have.  I ended up making a 45 degree attachment fitting out of epoxy/glass to solve that problem- which I still have the mold for if you or anyone else would like to borrow it.  This subject would be a good candidate for the MAINSHEET.
Cheers, Steve O 
 


Date: Sun, 12 Dec 2010 19:05:04 -0800
From: SSmolinske at rainierrubber.com
To: listserve at catalina38.org
Subject: [C38] Exhaust Riser



About 2 years ago I rebuilt the exhaust riser in port on vacation, so much for vacation.   I was in a small harbor with little in the way of  materials to work with, I used galvanized fittings and it worked fine for the last 18 months.   Well its not working so well now and needs to be rebuilt,  the attached photo shows what I did last time, does anyone have any better suggestions?  Thanks all.
 
Steve
#312 Peregrine
Seattle
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