Atomic 4 Exhaust Elbow - Page 2 - SailNet Community
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post #11 of 14 Old 12-24-2008
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Be careful to follow key principles when replacing an A4 exhaust system, noting the waterline, height of exhaust components above the waterline, and risk of back-flooding the A4 cylinders through the manifold.
http://www.abycinc.org/committees/P-01.pdf
Good Old Boat: Cool and Quiet and Trouble Free by Jerry Powlas and Dave Gerr
Exhaust Risers - Marine Engines : Boats and Yachts Maintenance, Repairs and Troubleshooting :
EXHAUST INSTALLATION

Not all installation ideas pertain to all A4s in all sailboat designs.
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post #12 of 14 Old 12-24-2008
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Starboard side access can be problematic but less so than before the 'operation'.
The pics were labled so I could find them conveniently in my photo library and may have been misleading. What I wanted to show was the install of the water cooled elbow. Floatsome's advice is well taken. The only mishap I ever had with the design was filling the crankcase with water when the engine failed to start but I continued to crank anyway, and the water pump simply continued to pump too, and it was a mess. Now I don't open the water intake valve until the engine is running. Has been working well for 25 yrs or so.
Howard Keiper
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post #13 of 14 Old 12-25-2008 Thread Starter
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THANKS ALL!!! Moyer Marine is exactly the store I was looking for. I am going to replace the whole exhaust and for super cheep compared to what I had originally thought it was going to cost. This website is invaluable. Moyer Marine has just the stuff I'm looking for at reasonable prices. I really appreciate everyone's help. My only question is if I use their water injection that injects the water below the exhaust, is there any risk of it sucking back into the exhaust manifold? I'm pretty sure the awnser is no, but any insight is welcome. Thanks again all who replied!

Ben
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post #14 of 14 Old 12-26-2008
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Ben, any coolant injection point, regardless of the way it is made (I have a Moyer inline coolant injection fitting that I am about to install in our rebuilt exhaust elbow using galvanized pipe), has to be far enough over the top and on the downside of the elbow to reduce the risk of coolant water backfilling the manifold. The links I provide above discuss the design principles, then the owner has to ensure the design meets the principles. Checking with owners of the same boat whose exhausts are working fine helps too.
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